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Hitachi SET FREE Series Service Manual
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Hitachi SET FREE Series Service Manual

Hitachi SET FREE Series Service Manual

Heat pump / heat recovery system
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–
SERVICE
MANUAL
–
SET FREE SERIES
Heat pump system
Heat recovery system
MODELS
RAS-(8-96)FSXNS2E - air365 Max
RAS-(5-54)FSXNP2E - air365 Max Pro
SMGB0147 rev.0- 01/2024

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Summary of Contents for Hitachi SET FREE Series

  • Page 1 – SERVICE MANUAL – SET FREE SERIES Heat pump system Heat recovery system MODELS RAS-(8-96)FSXNS2E - air365 Max RAS-(5-54)FSXNP2E - air365 Max Pro SMGB0147 rev.0- 01/2024...
  • Page 3 Contents General information .....................1 Electrical wiring ....................22 Control system ....................34 Optional functions ....................77 Test run ......................140 Electrical checks of the main parts ..............158 Servicing ......................197 Troubleshooting ....................253 Maintenance notes ..................386 SMGB0147 rev.0 - 01/2024...
  • Page 4 General Index 1.1 General information ..................2 1.2 Introduction .......................2 1.3 Applied symbols....................3 1.4 Norms and Regulations ..................4 1.5 Product guide ....................5 1.5.1 Classification of outdoor unit ..............5 1.5.2 Classification of the CH-Box ..............5 1.5.3 Icons description ..................6 1.5.4 Product line-up: Outdoor units ...............7 1.5.5 Product line-up: CH-Box ................8 1.5.6 Base units ....................9 1.5.7 Build up capacity combination ..............9 1.5.8 Unit combinations .................10 1.5.9 Accessory code list ................13 1.5.10 Product line-up: indoor units ..............14 1.5.11 Product line-up: HYDRO FREE ............19 1.5.12 Product line-up: KPI energy recovery units .........20 1.5.13 Product line-up: DX-Interface ..............21 1. Electrical wiring...
  • Page 5 2.2.2 Electrical wiring diagrams CH-Box ............29 2. Control system ......................34 3.1 Control system ....................35 3.1.1 Cycle control for heat pump ..............35 3.1.2 Cycle control for heat recovery .............36 3.1.3 Compressor operation control ..............38 3.1.3.1 Compressor rotation control ............38 3.1.3.2 Compressor frequency control ..........44 3.1.3.3 Compressor capacity control ...........48 3.1.4 Heat exchanger mode control (2 pipe system) ........48 3.1.5 Heat exchanger mode control (3 pipe system) ........50 3.1.6 Outline of the control system ..............55 3.2 Standard operation sequence .................56 3.2.1 Cooling operation ..................56 3.2.2 Dry operation ..................58 3.2.3 Antifreeze protection control during the cooling or dry operation ..60 3.2.4 Heating operation ..................61 3.2.5 Defrost operation ..................63 3.2.6  E xcessive high discharge air temperature prevention control (depending on the indoor unit model) ......64 3.3 Protection control ....................65 3.3.1 Control of the outdoor unit ..............65...
  • Page 6 3.4.1.2 CH-Box ..................78 3. Optional functions ....................79 4.1 Optional functions available in the outdoor units ..........81 4.2 Optional functions field settings ..............83 4.3 Installation settings ..................84 4.4 External input and output setting ..............86 4.5 Menu mode accessing (by 7-segment display) ..........86 4.5.1 Check mode ...................87 4.5.2 External input and output setting ............87 4.5.3 Function setting ..................87 4.6 External input and output setting (by 7-segment display) ......88 4.6.1 Available control functions ..............88 4.6.2 Setting of external input and output .............89 4.6.3 External input function setting ..............90 4.6.4 External output function setting ............95 4.7 Function setting (by 7-segment display) ............98 4.7.1 Sequence of the function setting ............98 4.7.2 Function setting ...................102 4.7.3 Circulator function at heating Thermo-OFF (FA) .......109 4.7.4 Night-shift (low noise)(ni) ..............110...
  • Page 7 4.7.11 Wave function setting (UE) ..............116 4.7.12 Cold draft protection (Fb) ..............117 4.7.13 Adjustment of fan rotation (Fo) ............117 4.7.14 Alternate defrosting function (L) ...........118 4.7.15 Outdoor fan motor intermittent operation setting (F4) ....118 4.7.16 FrostWash (F1) .................119 4.7.17 Minimum evaporating temperature setting for cooling (Hc) ..126 4.7.18 Cool/heat auto changeover enable/disable setting (F8) ....126 4.8 Power saving function from wired controller ..........134 4.8.1 Power savings mode settings ..............134 4.8.2 Intermittent control function ..............138 4.8.3 Power Consumption Display Function ..........140 4. Test run ........................142 5.1 Preliminary checks ..................143 5.2 Before the test run ..................144 5.3 Test run using the PC-ARFG2-E remote control ..........145 5.4 Test run from the outdoor unit ..............148 5.5 Checking at test run ..................150 5.6 Reset for accumulated operation time of compressor 1-2 (cU1-cU2) ..152 5.7 Setting of forced open valve mode ...............153 5.8 Refrigerant cycle checklist ................155...
  • Page 8 6.2 Inverter (INV1, INV2) ..................164 6.2.1 Inverter specifications .................164 6.2.2 High voltage discharge work for replacing parts ........166 6.2.3 Checking method of inverter PCB (INV) ..........167 6.2.4 Protection function ................174 6.2.5 Overload protection control ..............176 6.2.6 Inverter failure diagnosis mode ............177 6.3 Scroll compressor ..................178 6.3.1 Reliable mechanism for low vibration and low sound ......178 6.3.2 Compression principles ...............178 6.3.3 Structure ....................179 6.3.4 Compressor type .................179 6.3.5 Checking of compressor motor ............180 6.3.6 Check list on compressor ..............180 6.3.7 Additional information for “check list on compressor” ......181 6.4 Fan motor ......................182 6.5 Thermistors ....................183 6.5.1 Thermistor positions for RAS-(8-12)FSXNS2E and RAS-(5/6)FSXNP2E ..183 6.5.2 Thermistor positions for RAS-(14-18)FSXNS2E and RAS-(8-14)FSXNP2E ...184 6.5.3 Thermistor positions for RAS-(20-24)FSXNS2E and RAS-(16/18)FSXNP2E .185 6.5.4 Thermistor (Td) for discharge gas temperature ........186...
  • Page 9 6.6.1 Specifications for MV1 and MV2 ............188 6.6.2 Specifications for MVB ................189 6.7 Pressure sensor (Pd) ..................190 6.7.1 High pressure control ................190 6.7.2 Low pressure control ................191 6.8 High pressure protection device (PSH) ............192 6.9 Electrical coil parts..................193 6.10 Noise filter (NF1, NF2) ...................193 6.11 Reactor (DCL1 and DCL2) ................195 6.12 CH-Box PCB (PCB1) ..................196 6.12.1 Check points PCB1 of single type CH-Box .........196 6.12.2 Check points PCB1-4 of multi type CH-Box ........196 6.12.3 Specifications for MVD1 and MVS1 ..........197 6. Servicing ........................199 7.1 Removing the front covers ................201 7.1.1 Removing service front cover ..............201 7.1.2 Removing bottom front cover .............202 7.1.3 Removing front right cover..............202 7.2 Removing the electrical box covers ...............203 7.2.1 Removing the electrical box cover ............203 7.3 Removing the electrical box ................203...
  • Page 10 7.7 Replacing the refrigerant oil ................220 7.7.1 No clogging in return oil circuit ............220 7.7.2 Clogging in return oil circuit and replacing return oil circuit ....221 7.8 Removing the coils ..................224 7.8.1 Coil position ..................224 7.8.2 Removing the expansion valve coil (MV1, MV2, MVB) .......225 7.8.3 Removing the solenoid valve coil (SVA, SVG) ........226 7.8.4 Removing the reversing valve coil (RVR1, RVR2) ........227 7.9 Removing the valves ..................227 7.9.1 Removing the expansion valve (MV1, MV2, MVB) ......227 7.9.2 Removing the solenoid valve (SVA, SVX2, SVG) ........228 7.9.3 Removing the reversing valve .............229 7.9.4 Removing the stop valve ..............231 7.10 R emoving the PSH, high and low pressure sensors and thermistors ...232 7.10.1 High pressure switch, high/low pressure sensor position and thermistors ...................232 7.10.2 Removing the high pressure switch (PSH1, PSH2) ......234 7.10.3 Removing the high pressure (Pd) and low pressure (Ps) sensor ..234 7.11 Removing the pipe thermistor ..............235 7.12 Removing the ambient temperature thermistor ..........236 7.13 Removing other electrical components ............237...
  • Page 11 7.14.1 Removing the front service cover for electrical box and electronic expansion valve ..................247 7.14.2 Removing the electrical components ..........248 7.14.3 Removing electronic expansion valve coil ........252 7. Troubleshooting ......................255 8.1 Initial troubleshooting ...................257 8.1.1 Checking the electrical wires and the power source ......257 8.1.2 Checking by 7-segment display ............258 8.1.3 Checking of the alarm code history ............259 8.1.4  E mergency mode operation from the remote control .......265 8.1.5  Emergency mode operation from the outdoor unit PCB1 for compressor failure ................266 8.1.5.1  F or combination of outdoor units ..........266 8.1.5.2  F or outdoor units without combination .......268 8.1.6 Failure of the power supply to indoor units and the remote control switch ....................270 8.1.7 Abnormal transmission between remote control switch and indoor unit 8.1.8 Abnormal operation of the devices ............272 8.2 Procedure for troubleshooting ..............283 8.2.1 Alarm codes of wired controller ............283 8.2.2 Alarm code CH-Box ................288...
  • Page 12 8.4.4 Activation condition of the protection retry control code....368 8.4.5 Check method by checking mode ............370 8.5 RSW, DSWs and LEDs functions ..............383 8.5.1 Outdoor unit ..................383 8.5.1.1 Location of print circuit boards (PCBs) ........383 8.5.1.2 Purpose ...................383 8.5.2 CH-Box ....................386 8. Maintenance notes ....................388 9.1 Burnt-out compressor due to an insufficient refrigerant charge ....389 9.2 Alarm code "31" ....................389 9.3 N ot cooling well due to insufficient installation space for the outdoor unit 390 9.4 Maintenance work..................390 9.5 Service and maintenance table through the 7-segment display ....392 9.5.1 Information of connected outdoor/indoor capacity ......392 9.5.2 Information of outdoor unit ..............393 9.5.3 Information of Indoor unit ..............394 9.5.4 Information of cause code of alarm ............395 9.5.5 Information of cause code of alarm record ........395 9.6 Service and maintenance table through the remote control switch ...396...
  • Page 13 General Information 1.1 General information ..................2 1.2 Introduction .......................2 1.3 Applied symbols....................3 1.4 Norms and Regulations ..................4 1.5 Product guide ....................5 1.5.1 Classification of outdoor unit ..............5 1.5.2 Classification of the CH-Box ..............5 1.5.3 Icons description ..................6 1.5.4 Product line-up: Outdoor units ...............7 1.5.5 Product line-up: CH-Box ................8 1.5.6 Base units ....................9 1.5.7 Build up capacity combination ..............9 1.5.8 Unit combinations .................10 1.5.9 Accessory code list ................13 1.5.10 Product line-up: indoor units ..............14 1.5.11 Product line-up: HYDRO FREE ............19 1.5.12 Product line-up: KPI energy recovery units .........20 1.5.13 Product line-up: DX-Interface ..............21 SMGB0147 rev.0 - 01/2024...
  • Page 14 1.2 Introduction Hitachi proudly presents the air365 Max and air365 Max Pro models in the SET FREE series. The requirements for air conditioning have diversified in line with the evolution of the space, structure, necessary functions and building design and the new series are designed to meet them.
  • Page 15 Combination ratio Model air365 Max 50-200 (130) % air365 Max Pro 50-200 (150) % 1.3 Applied symbols During normal air to air heat pump system design work or unit installation, greater attention must be paid in certain situations in order to avoid damage to the unit, the installation or the building or property.
  • Page 16 The refrigerant used in each unit is identified on the specification label and manuals of the unit. Hitachi shall not be held liable for any failure, trouble, malfunction or accident caused by units illegally charged with refrigerants other than the specified one.
  • Page 17 1.5.1 Classification of outdoor unit Unit type: RAS Position-separating hyphen (fixed) System capacity (HP): air365 Max (8-96), air365 Max Pro (5-54) SET FREE series X: Heat Pump system (2 pipe) and Heat Recovery system (3 pipe) Refrigerant type N: R410A S: air365 Max...
  • Page 18 ◆ CH-Box multi    Unit Type CH: Cooling/Heating Changeover Box Position-separating hyphen (fixed) Refrigerant type AP: R410A Maximum Connectable Indoor Unit Capacity (HP) 04: 4 branches; 08: 8 branches;12: 12 branches;16: 16 branches M : multiple Applicable System SSX: for Heat Recovery System (3 Pipes System) 1.5.3 Icons description Icons between brackets mean possible extra operations to the factory-supplied ones (additional accessories, field-supplied accessories or systems might be required).
  • Page 19 1.5.4 Product line-up: Outdoor units ◆ air365 Max    Heat recovery: 3 pipe system Heat pump: 2 pipe system Unit Code Unit Code Unit Code RAS-8FSXNS2E 7E335010 RAS-14FSXNS2E 7E335030 RAS-20FSXNS2E 7E335039 RAS-10FSXNS2E 7E335011 RAS-16FSXNS2E 7E335031 RAS-22FSXNS2E 7E335051 RAS-12FSXNS2E 7E335012 RAS-18FSXNS2E 7E335032 RAS-24FSXNS2E 7E335040 ◆...
  • Page 20 1.5.5 Product line-up: CH-Box CH-Box CH-AP160SSX 60292158 Single branch CH-AP280SSX 60292159 4 Branch CH-AP04MSSX 60292160 8 Branch CH-AP08MSSX 60292161 Multiple 12 Branch CH-AP12MSSX 60292162 16 Branch CH-AP16MSSX 60292163 SMGB0147 rev.0 - 01/2024...
  • Page 21 1.5.6 Base units ◆ air365 Max    Model RAS-8FSXNS2E RAS-10FSXNS2E RAS-12FSXNS2E RAS-14FSXNS2E RAS-16FSXNS2E Model RAS-18FSXNS2E RAS-20FSXNS2E RAS-22FSXNS2E RAS-24FSXNS2E ◆ air365 Max Pro    Model RAS-5FSXNP2E RAS-6FSXNP2E RAS-8FSXNP2E RAS-10FSXNP2E RAS-12FSXNP2E Model RAS-14FSXNP2E RAS-16FSXNP2E RAS-18FSXNP2E 1.5.7 Build up capacity combination Build up the total capacity Build up the total capacity Base unit Heat Recovery (3 pipe system)
  • Page 22 1.5.8 Unit combinations ◆ air365 Max    Models from 26 HP to 96 HP range consist of the combination of two, three or four base units, according to the details provided in the following tables. CAUTION Only the combinations in the table are allowed, not being possible to mix heat pump system (2 pipes system) and heat recovery system (3 pipes system) in the same combination.
  • Page 23 Combinations of base units only for heat pump system DSW7 pin4 must be set OFF in all the modules of the combination. Model RAS-56FSXNS2E RAS-58FSXNS2E RAS-60FSXNS2E RAS-62FSXNS2E RAS-64FSXNS2E RAS-22FSXNS2E RAS-22FSXNS2E RAS-24FSXNS2E RAS-22FSXNS2E RAS-24FSXNS2E RAS-18FSXNS2E RAS-18FSXNS2E RAS-18FSXNS2E RAS-22FSXNS2E RAS-22FSXNS2E Combination RAS-16FSXNS2E RAS-18FSXNS2E RAS-18FSXNS2E RAS-18FSXNS2E...
  • Page 24 ◆ air365 Max Pro    Models from 20 HP to 54 HP range consist of the combination of two, three or four base units, according to the details provided in the following tables. CAUTION Only the combinations in the table are allowed, not being possible to mix heat pump system (2 pipes system) and heat recovery system (3 pipes system) in the same combination.
  • Page 25 1.5.9 Accessory code list Hitachi offers a range of different accessories and remote control systems that can be used with the air365 outdoor units. Please consult the corresponding Technical Catalogue for controls. Name Description Code Figure MC-20AN1 70526209 MC-21AN1 70526210 MC-30AN1...
  • Page 26 1.5.10 Product line-up: indoor units ◆ RCI and RCIM indoor units    RCI ( R32 / R410A ) RCIM ( R32 / R410A ) 4-way cassette 4-way cassette (compact) Unit Code Unit Code RCIM-0.4FSRE (*1) 7E414148 RCIM-0.6FSRE (*2) 7E414137 RCIM-0.8FSRE 7E414100 RCI-1.0FSR1 7C405314 RCIM-1.0FSRE...
  • Page 27 ◆ RCD and RPC indoor units    RCD ( R32 / R410A ) RPC ( R32 / R410A ) 2-way cassette Ceiling type Unit Code Unit Code Unit Code RCD-0.8FSR (*) 60279168 RCD-1.0FSR (*) 60279169 RCD-1.5FSR (*) 60279170 RPC-1.5FSR 60279267 RCD-2.0FSR (*) 60279171 RPC-2.0FSR...
  • Page 28 ◆ RPI indoor units    RPIL ( R32 / R410A ) RPI ( R32 / R410A ) RPIH ( R32 / R410A ) Ducted indoor units Unit Code Unit Code Unit Code RPIL-0.4FSR1E(*1) 7E426062 RPIL-0.6FSR1E (*2) 7E426050 RPIL-0.8FSR1E 7E426000 RPIL-1.0FSR1E 7E426001 RPIL-1.5FSR1E 7E426063...
  • Page 29 RPI ( R410A ) Ducted indoor units Unit Code Unit Code RPI-8.0FSN3E (*1) 7E424010 RPI-8.0FSN3E-f (*1) 7E424410 RPI-10.0FSN3E (*1) 7E424011 RPI-10.0FSN3E-f (*1) 7E424411 RPI-16.0FSN3PE (*2) 7E425038 RPI-16.0FSN3PE-f (*2) 7E425438 RPI-20.0FSN3PE (*2) 7E425039 RPI-20.0FSN3PE-f (*2) 7E425439 (*1): In combination with UTOPIA Prime / UTOPIA IVX Prime and UTOPIA IVX Standard / Premium series: 1 indoor unit system only.
  • Page 30 ◆ RPK, RPF and RPFI indoor units    RPK ( R32 / R410A ) RPF ( R410A ) RPFI ( R410A ) Wall type Floor type Floor concealed type Unit Code Unit Code Unit Code RPK-0.4FSRM (*1) 60279204 RPK-0.4FSRHM (*1) 60279221 RPK-0.6FSRM (*2) 60279205...
  • Page 31 1.5.11 Product line-up: HYDRO FREE ◆ Low temperature    RWLT (R410A) ( )( )( )( ) Unit Code Unit Code Unit Code RWLT-3.0VN1E 7E476018 RWLT-5.0VN1E 7E476021 RWLT-10.0VN1E 7E476024 NOTE The PC-ARFWE controller required for the operation of the HYDRO FREE Low temperature is factory built in these models.
  • Page 32 HYDRO FREE compatibility RWLT-(3.0-10.0)VN1E and RWHT-5.0VNF1E are compatible only with the following SET FREE series: • SET FREE Sigma - RAS-FSXN(P/S)E(1) • air365 Max and air365 Max Pro - RAS-FSXN(S/P)2E • Set Free Mini - RAS-(8-12)FSXNME(1) (DSW3 setting is required) 1.5.12 Product line-up: KPI energy recovery units...
  • Page 33 1.5.13 Product line-up: DX-Interface DX-Interface EVX (R410A) Unit Code EXV-2.0E2 7E611000 EXV-2.5E2 7E611001 EXV-3.0E2 7E611002 Control box EXV-4.0E2 7E611003 EXV-5.0E2 7E611004 EXV-6.0E2 7E611005 Expansion valve box EXV-8.0E2 7E611006 EXV-10.0E2 7E611007 SMGB0147 rev.0 - 01/2024...
  • Page 34 Electrical wiring 2.1 Outdoor unit ....................23 2.1.1 General information ................23 2.1.2 Electrical wiring diagrams of the outdoor units ........25 2.2 CH-Box ......................28 2.2.1 General information ................28 2.2.2 Electrical wiring diagrams CH-Box ............29 SMGB0147 rev.0 - 01/2024...
  • Page 35 2.1 Outdoor unit 2.1.1 General information CAUTION • Before any work to the electrical wiring or regular inspections, switch off the mains power supply of the indoor and outdoor units. Wait three minutes before starting installation or maintenance work. • Make sure that the interior and exterior fans have come to a complete standstill before starting work on the electrical wiring or regular inspections.
  • Page 36 3 Sometimes, the refrigeration/heating system is not able to operate correctly in the following cases: ✓ When the system is supplied from the same supply line as other major consumers (heavy machinery, power inverter systems, cranes, welding machinery, etc). ✓ When the supply cables of the major consumers and the refrigeration/heating system are very close together.
  • Page 37 2.1.2 Electrical wiring diagrams of the outdoor units ◆ RAS-(8-12)FSXNS2E/RAS-(5-6)FSXNP2E    Circuit breaker + Main switch (Part prepared on site) ELB: Earth leakage breaker (Part prepared on site) Power Circuit Mark Name Mark Name Mark Name Mark Name Crankcase heater Grounding (Field wiring) PCB control Solenoid valve (For super cooling bypass) Connector for external output...
  • Page 38 ◆ RAS-(14-18)FSXNS2E/RAS-(8-14)FSXNP2E    Circuit breaker + Main switch (Part prepared on site) ELB: Earth leakage breaker (Part prepared on site) Power Circuit Mark Name Mark Name Mark Name Mark Name Crankcase heater Grounding (Field wiring) PCB control Solenoid valve (For super cooling bypass) Connector for external output Inverter PCB PCB control...
  • Page 39 ◆ RAS-(20-24)FSXNS2E/RAS-(16-18)FSXNP2E    Circuit breaker + Main switch (Part prepared on site) ELB: Earth Leakage breaker (Part prepared on site) Power Circuit Power Circuit Mark Name Mark Name Mark Name Mark Name Crankcase heater Grounding (Field wiring) PCB control Solenoid valve (For super cooling bypass) Connector for external output Inverter PCB PCB control...
  • Page 40 2.2 CH-Box 2.2.1 General information DANGER • Turn OFF the main power switch to the CH-Box, the indoor unit and the outdoor unit before electrical wiring work or a periodical check is performed. • Protect the wires, electrical parts, etc. from rats or other vermin. •...
  • Page 41 2.2.2 Electrical wiring diagrams CH-Box ◆ CH-AP160SSX and CH-AP280SSX    Mark Torque tightening the terminal Screw Size 1.0~1.3 (Nm) 0.7~1.1 (Nm) M3.5 Mark Name Remark PCB1 Printed circuit board Terminal Block For Power Supply Terminal Block For Communication (Green) (Green) (Green) (Green) ,MVS Electronic Expansion Valve...
  • Page 42 ◆ CH-AP04MSSX    ~230V 50Hz Mark Torque tightening the terminal Screw Size Indoor unit Wiring position TB3-3 MVD 1 1.0~1.3 (Nm) Indoor unit A TB3-4 MVS 1 TB3-5 MVD 2 1.0~1.3 (Nm) Indoor unit B TB3-6 MVS 2 Indoor unit PCB1 TB4-7 MVD 3...
  • Page 43 ◆ CH-AP08MSSX    Torque tightening Mark Screw Size Indoor unit Wiring position Indoor unit Wiring position the terminal ~230V 50Hz TB3-3 MVD 1 TB3-3 MVD 1 1.0~1.3 (Nm) Indoor unit A Indoor unit E TB3-4 MVS 1 TB3-4 MVS 1 TB3-5 MVD 2 TB3-5...
  • Page 44 ◆ CH-AP12MSSX    ~230V 50Hz (Red) (Red) (Red) (Red) (Green) (Red) (Red) (Green) (Green) (Green) (Green) (Green) (Green) (Green) (Green) (Yellow) (Yellow) (Yellow) (Green) (Green) (Green) (Green) (Green) (Green) (Yellow) (Yellow) (Yellow) (Green) (Green) (Green) (Green) (Green) (Green) (Green) (Green) (Green) Outdoor unit Indoor unit...
  • Page 45 ◆ CH-AP16MSSX    ~230V 50Hz (Red) (Red) (Red) (Red) (Red) (Red) (Green) (Red) (Green) (Red) (Green) (Green) (Green) (Green) (Green) (Green) (Green) (Green) (Green) (Green) (Yellow) (Yellow) (Yellow) (Yellow) (Green) (Green) (Green) (Green) (Green) (Green) (Green) (Green) (Yellow) (Yellow) (Yellow) (Yellow) (Green) (Green)
  • Page 46 Control system 3.1 Control system ....................35 3.1.1 Cycle control for heat pump ..............35 3.1.2 Cycle control for heat recovery .............36 3.1.3 Compressor operation control ..............38 3.1.3.1 Compressor rotation control ............38 3.1.3.2 Compressor frequency control ..........44 3.1.3.3 Compressor capacity control ...........48 3.1.4 Heat exchanger mode control (2 pipe system) ........48 3.1.5 Heat exchanger mode control (3 pipe system) ........50 3.1.6 Outline of the control system ..............55 3.2 Standard operation sequence .................56...
  • Page 47 3.1 Control system 3.1.1 Cycle control for heat pump Cooling operation (*) Heating operation Defrosting Control device Control Category Purpose of Control Control Category Purpose of Control Condition Inverter frequency Inverter frequency control is carried control is carried out to make out to make All the Compressor...
  • Page 48 3.1.2 Cycle control for heat recovery Cooling and Heating Cooling operation (*) Heating operation Defrosting operation Control device Control Purpose of Control Purpose of Control Purpose of Condition Category Control Category Control Category Control Inverter frequency control is carried out to Cooling mainly: make indoor cooling capacity...
  • Page 49 Cooling and Heating Cooling operation (*) Heating operation Defrosting operation Control device Control Purpose of Control Purpose of Control Purpose of Condition Category Control Category Control Category Control PI control is Cooling mainly: performed to For a base unit: Pd control reach the target PI control is PI control is...
  • Page 50 3.1.3 Compressor operation control 3.1.3.1 Compressor rotation control The purpose of this compressor rotation control is to ensure equal operating time for each outdoor unit. This control is carried out when the outdoor unit is in thermo-OFF or switch OFF mode. When the outdoor unit is switched ON, the inverter compressor with the shortest operating time (based on the average operating time of the outdoor unit with two inverter compressors installed) will be given priority for operation.
  • Page 51 RAS-(44-48)FSXNS2E and RAS-(34/36)FSXNP2E Outdoor unit A Outdoor unit B Inverter Inverter Inverter Inverter compressor 1 compressor 2 compressor 1 compressor 2 Outdoor unit A Outdoor unit B Inverter Inverter Inverter Inverter compressor 1 compressor 2 compressor 1 compressor 2 Last time Currently Next time NOTE...
  • Page 52 RAS-(56-60)FSXNS2E and RAS-(44/46)FSXNP2E Outdoor unit A Outdoor unit B Outdoor unit C Inverter Inverter Inverter Inverter compressor compressor compressor 1 compressor 2 Outdoor unit A Outdoor unit B Outdoor unit C Inverter Inverter Inverter Inverter compressor 1 compressor 2 compressor 1 compressor 2 Last time Currently...
  • Page 53 RAS-(68-72)FSXNS2E and RAS-(52/54)FSXNP2E Outdoor unit A Outdoor unit B Outdoor unit C Inverter Inverter Inverter compressor 1 compressor 2 compressor 1 Inverter Inverter Inverter compressor 2 compressor 1 compressor 2 Outdoor unit A Outdoor unit B Outdoor unit C Inverter Inverter Inverter Inverter...
  • Page 54 RAS-(80-84)FSXNS2E Outdoor unit A Outdoor unit B Outdoor unit C Outdoor unit D Inverter Inverter Inverter Inverter compressor 2 compressor 2 compressor compressor Inverter Inverter compressor 1 compressor 1 Outdoor unit A Outdoor unit B Outdoor unit C Outdoor unit D Inverter Inverter Inverter...
  • Page 55 RAS-(92-96)FSXNS2E Outdoor unit A Outdoor unit B Outdoor unit C Outdoor unit D Inverter Inverter Inverter Inverter compressor 2 compressor 2 compressor 2 compressor 2 Inverter Inverter Inverter Inverter compressor 1 compressor 1 compressor 1 compressor 1 Outdoor unit A Outdoor unit B Inverter Inverter...
  • Page 56 3.1.3.2 Compressor frequency control Operational control is carried out to optimise the compressor output frequency or to carry out the turning on and stopping while in constant operation in accordance with the target frequency (the target frequency is determined by the calculation of the PID control and the heating and cooling load).
  • Page 57 ◆ In case of multiple outdoor units (two outdoor units)    2 Outdoor units Compressor 1 Outdoor unit Operation Status Max frequency Frequency of Inverter Comp (Hz) Target Frequency (Hz) Each compressor frequency (Hz) Target Increase direction Decrease direction frequency Compressor Outdoor unit Outdoor unit...
  • Page 58 ◆ In case of multiple outdoor units (three outdoor units)    3 Outdoor units 2 Outdoor units Compressor 1 Outdoor unit Operation Status Max frequency Frequency of Inverter Comp (Hz) Target Frequency (Hz) Each compressor frequency (Hz) Target Increase direction Decrease direction frequency Compressor...
  • Page 59 ◆ In case of multiple outdoor units (four outdoor units)    Outdoor unit 4 Outdoor units Operation Status 3 Outdoor units 2 Outdoor units 1 Outdoor unit Max. frequency Frequency of Inverter Comp. (Hz) Target frequency (Hz) Each compressor frequency (Hz) Target Increase direction Decrease direction...
  • Page 60 3.1.3.3 Compressor capacity control The operating speed of the compressor is determined according to the temperature difference (ΔT) between setting temperature and indoor unit air inlet temperature detected by each indoor unit under cooling/heating thermo-ON operation and the variation of ΔT to control compressor frequency.
  • Page 61 Number of outdoor unit: 2 Heat exchanger mode Cooling mode Heating mode Defrost mode Heat exchanger condition COND EVAP COND Reversing valve Fully open Heat exchanger SH Fully open Expansion valve Tsc-Tchg Tchg-Tsc Tsc-Tchg Heat exchanger condition COND EVAP COND Reversing valve Fully open Heat exchanger SH...
  • Page 62 Number of outdoor unit (only heat pump system): 4 Heat exchanger mode Cooling mode Heating mode Defrost mode Heat exchanger condition COND EVAP COND Reversing valve RVR2 Fully open Fully open Expansion valve Tsc-Tchg Tchg-Tsc Tsc-Tchg Heat exchanger condition COND EVAP COND Reversing valve...
  • Page 63 Number of outdoor unit: 2 Mainly Mainly Cooling mode Heating mode cooling mode heating mode Heat exchanger mode COND EVAP Heat exchanger COND COND COND cond EVAP EVAP condition RVR2 Reversing valve RVR1 Heat exchanger Heat exchanger Expansion valve Tsc-Tchg Tsc-Tchg Tsc-Tchg Closed...
  • Page 64 Number of outdoor unit: 3 Cooling mode Mainly cooling mode Heat exchanger mode COND D2-1 D2-2 Heat exchanger COND COND COND COND condition RVR2 Reversing valve RVR1 Expansion valve Tsc-Tchg Tsc-Tchg Tsc-Tchg Tsc-Tchg Heat exchanger COND COND evap evap condition RVR2 Reversing valve RVR1...
  • Page 65 Mainly heating mode Heating mode Heat exchanger mode D2-3 D3-1 D3-2 EVAP Heat exchanger cond cond cond EVAP EVAP condition RVR2 Reversing valve RVR1 Heat exchanger Heat exchanger Expansion valve Tchg-Tsc Tchg-Tsc Tchg-Tsc Tchg-Tsc Tchg-Tsc Heat exchanger EVAP EVAP EVAP EVAP EVAP condition...
  • Page 66 Defrostin mode Heat exchanger mode DEF2 DEF1 with CH-Box without CH-Box Heat exchanger condition COND/EVAP COND RVR2 ON/OFF Reversing valve RVR1 Fully open/Heat Fully open exchanger SHPd Expansion valve Tsc-Tchg/Tchg-Tsc Tsc-Tchg Heat exchanger condition COND/EVAP COND RVR2 ON/OFF Reversing valve RVR1 Fully open/Heat Fully open...
  • Page 67 TCHG: Thermistor for Liquid Stop Valve Temperature. 3.1.6 Outline of the control system The figure below shows the outline of the control system. to Transmission Circuit of Combination Outdoor Unit Thermistor for Inlet Air Thermistor of Outlet Air Multiple Signals Thermistor for ambient temperature “TA” (THM7) Thermistor for Gas Pipe Discharge Gas Thermistor “TD1”...
  • Page 68 3.2 Standard operation sequence 3.2.1 Cooling operation Only for indoor unit Auto-louver Start of Transmitting between indoor and with Auto-Louver 0 Reset outdoor unit Power to indoor Power to indoor Start of Transmitting between indoor unit unit PCB: ON unit: ON and remote control switch (Higher than Activation Level) Float...
  • Page 69 Cooling operation (continued) Start of AUTO-LOUVER Only for Air Panel Press AUTO- Alternately or indoor unit with LOUVER Switch Auto-Louver Stop of AUTO-LOUVER Press RUN/STOP Switch After 3 min. MD Operation: OFF and 20 s for Unit with Drain Pump MIF Operation: OFF RUN indicator: OFF.
  • Page 70 3.2.2 Dry operation Auto-louver Only for indoor unit 0 Reset with Auto-Louver Start of Transmitting between I.U and O.U Power to indoor unit Power to indoor PCB: ON Start of Transmitting between unit: ON I.U and Remote Control Switch (Higher than Float Switch Activation Level) MD Operation: ON...
  • Page 71 Dry operation (continued) Start of AUTO-LOUVER Only for Air Panel Press AUTO- Alternately or indoor unit with LOUVER Switch Auto-Louver Stop of AUTO-LOUVER Press RUN/STOP Switch After 3 min. MD Operation: OFF and 20 s For Unit with Drain Pump MIF Operation: OFF RUN indicator: OFF.
  • Page 72 3.2.3 Antifreeze protection control during the cooling or dry operation Power supply Cooling Operation or Dry Operation Is compressor operated for more than *15 min. or the accumulated operation time of compressor exceeded 30 min.? *The judging time varies depending on indoor unit model Cooling Operation or Dry Operation Pipe Surface...
  • Page 73 3.2.4 Heating operation Start of Transmitting between indoor unit and outdoor unit Power to Power to indoor unit PCB: ON indoor unit: ON Only for Indoor Unit Start of Transmitting between with Auto-Louver Auto-louver indoor unit and Remote Control Switch 0 Reset Set Operation HEAT Indication Mode at “HEAT”...
  • Page 74 Heating operation (continued) Start of AUTO-LOUVER Only for Air Panel Press AUTO- Alternately or indoor unit with LOUVER Switch Auto-Louver Stop of AUTO-LOUVER Y52H: Relay for auxiliary electrical heater. 52H: Electromagnetic contactor for auxiliary electrical heater. Cut the power to Y52H Cut the power to 52H Auxiliary electrical heater H1: OFF Press...
  • Page 75 3.2.5 Defrost operation Heating Operation Outdoor evaporating Outdoor evaporating temperature is lower than defrosting temperature is lower Heating Operation Time initiation temperature condition (b) and outdoor fan than defrosting initiation 40 minutes or above electrical power increase more than 10 %. temperature condition (a) Defrosting Operation RVR2.
  • Page 76 3.2.6  Excessive high discharge air temperature prevention control (depending on the indoor unit model) Heating Operation < 65 Indoor unit Air Outlet Temperature > 65 Thermo-OFF Is it continuous more than 3 min.? > 60 Indoor unit Air Outlet Temperature <...
  • Page 77 3.3 Protection control 3.3.1 Control of the outdoor unit Whenever protection control sequences are activated, the corresponding code is displayed on the 7-segment LED array of the main control board. Protection control code is displayed when a unit protection mode has been initiated. The code will disappear once the cause of protection has been addressed.
  • Page 78 b. Low compression ratio protection function This function is activated to protect the compressor during occurrences of low compression ratio. Normal operation Forced increase in frequency (0.25 Hz/s) Not allowing frequency decreases (only frequency increase are allowed) Abnormal stoppage (cause of stoppage d1-11) For 1 min.
  • Page 79 ◆ P03: Inverter current protection control    The Inverter current protection control is carried out to prevent the damage of the inverter caused by the increase of inverter secondary current value. a. Inverter Secondary Current Protection Normal operation Forced decrease in frequency (3.0 Hz/s) Not allowing frequency increases linv >...
  • Page 80 b. Primary current protection for each inverter PCB Normal operation Forced decrease in frequency (1.0 Hz/s) lsep <I2 lsep I1 Not allowing frequency increases (only frequency decreases are allowed) lsep <I4 lsep. Inverter primary current lsep I3 NOTE • With a combination of base units, the control in the figure is performed for each outdoor unit connected.
  • Page 81 Model Model RAS-8FSXNS2E 13.0 14.0 14.0 14.5 RAS-5FSXNP2E 10.1 10.1 10.6 RAS-10FSXNS2E 18.6 19.6 19.6 20.1 RAS-6FSXNP2E 10.7 10.7 11.2 RAS-12FSXNS2E 20.9 21.9 21.9 22.4 RAS-8FSXNP2E 12.5 13.5 13.5 14.0 RAS-14FSXNS2E 26.2 27.2 27.2 27.7 RAS-10FSXNP2E 16.4 17.4 17.4 17.9 RAS-16FSXNP2E 29.8 30.8...
  • Page 82 ◆ P05: Discharge temperature increase protection control    The discharge temperature increase protection control is carried out to protect the compressor motor coil from a discharge pressure increase during an anomaly. Normal operation Forced decrease in frequency (1.0 Hz/s) Not allowing frequency increases (only frency decreases are allowed) Abnormal stoppage (cause of stoppage d1-15) For 5 seconds...
  • Page 83 ◆ P09: High pressure decrease protection control    The suction pressure protection control is carried out to protect the compressor from a transitory decrease in suction pressure. Normal operation Forced increase in frequency (0.125 Hz/s) Not allowing frequency decreases (only frequency increases are allowed) Abnormal stoppage (cause of stoppage d1-26) (1).
  • Page 84 ◆ P0d: Low pressure increase protection control    The compressor operation frequency is controlled to protect the compressor from suction pressure transitional increasing. Normal operation Forced increase in frequency (0.125 Hz/s) Not allowing frequency decreases (only frequency increases are allowed) Abnormal stoppage (cause of stoppage d1-26) 1.69 (1).
  • Page 85 The relative of priority  Lower priority order of protection control function Forced Forced Prohibited Prohibited decrease increase increase decrease Forced decrease      Forced increase     Higher priority order of protection control Prohibited increase ...
  • Page 86 ◆ Oil return control    Oil return control is performed in order to avoid insufficient oil supply to the compressor caused by long time low frequency operation. This control is utilized to return the oil flow out to the indoor unit side from the compressor.
  • Page 87 Detail of control Compressor: Increase the compressor speed above the required value to return the oil to the compressor. Expansion valve: (In the vase of cooling operation) Open the expansion valve of the indoor unit under thermo-ON. (In the case of heating operation) Open the expansion valve of the outdoor unit. Deactivating condition: This control function is cancelled when the oil return control continues for more than 60 sec.
  • Page 88 3.3.2 Control of CH-Box Single branch type: CH-AP160SSX, CH-AP280SSX. Multiple branch type: CH-AP04MSSX, CH-AP08MSSX, CH-AP12MSSX, CH-AP16MSSX. The following table shows the expansion valve opening of CH-Box at the steady condition. The expansion valve opening right after the operation mode change (such as thermo-ON → thermo-OFF) may not be matched with the table below.
  • Page 89 2 CH-Box expansion valve opening at OFF or with each operation mode Expansion valve opening of CH-Box Outdoor unit operation mode Expansion valve (pls) Indoor unit operation mode opening of when connected to CH-Box Reversing indoor unit (pls) valve (RVR1) RVR1 ON HEATING ·...
  • Page 90 3.4 Control and safety devices 3.4.1 Compressor protection 3.4.1.1 Outdoor unit The compressor is protected by the following devices and their combinations: 1. High pressure switch: this switch stops the compressor when the discharge pressure exceeds the set value. 2. Oil heater: this band-type heater protects against the formation of foam on the oil during cold starts and remains enabled when the compressor is at a standstill.
  • Page 91 Optional functions 4.1 Optional functions available in the outdoor units ..........84 4.2 Optional functions field settings ..............86 4.3 Installation settings ..................87 4.4 External input and output setting ..............89 4.5 Menu mode accessing (by 7-segment display) ..........89 4.5.1 Check mode ...................90 4.5.2 External input and output setting ............90 4.5.3 Function setting ..................90 4.6 External input and output setting (by 7-segment display) ......91 4.6.1 Available control functions ..............91 4.6.2 Setting of external input and output .............92 4.6.3 External input function setting ..............93 4.6.4 External output function setting ............98 4.7 Function setting (by 7-segment display) ............101 4.7.1 Sequence of the function setting ............101 4.7.2 Function setting ...................105 4.7.3 Circulator function at heating Thermo-OFF (FA) .......112 4.7.4 Night-shift (low noise)(ni) ..............113 4.7.5 Cancellation of the outdoor ambient temperature limit (GS) ...114...
  • Page 92 4.7.12 Cold draft protection (Fb) ..............120 4.7.13 Adjustment of fan rotation (Fo) ............120 4.7.14 Alternate defrosting function (L) ...........121 4.7.15 Outdoor fan motor intermittent operation setting (F4) ....121 4.7.16 FrostWash (F1) .................122 4.7.17 Minimum evaporating temperature setting for cooling (Hc) ..129 4.7.18 Cool/heat auto changeover enable/disable setting (F8) ....129 4.8 Power saving function from wired controller ..........137 4.8.1 Power savings mode settings ..............137 4.8.2 Intermittent control function ..............141 4.8.3 Power Consumption Display Function ..........143 SMGB0147 rev.0 - 01/2024...
  • Page 93 4.1 Optional functions available in the outdoor units External input function Optional function Explanation Fixing operation mode This function fixes the operation mode, heating or cooling. If indoor unit is set on Heating (heating/cooling) (cooling) mode when cooling (heating) mode is fixed, the indoor unit will be thermo-OFF. When this function is enabled, the compressor is stopped and the indoor units are put Demand stoppage under thermo-OFF condition.
  • Page 94 Optional functions (by 7–segment display) Optional function Explanation Minimum evaporating temperature setting for cooling Target value of the compressor frequency for heating Target value of the Indoor unit expansion valve control for cooling Target value of the Indoor unit expansion valve control for heating Indoor expansion valve opening change for These configurations are used to optimize the system’s operation,...
  • Page 95 4.2 Optional functions field settings There are three methods to set the advanced functions. 1 Using a smartphone (NFC) 2 Using push switches (PSW) 3 Using dip switches (DSW) Since the last setting of the three methods of setting will take effect, the dip switch (DSW) setting may not match the setting stored in the outdoor unit memory.
  • Page 96 4.3 Installation settings Installation setting items by 7-segment display symbol: inSt Installation setting item 7 segment display Description Refrigerant system No. 0 (Initial setting) Refrigerant system setting 63 Refrigerant system No. 63 Single unit A (No. 0 unit) (Initial setting) Combination unit A (No.
  • Page 97 The action of this FS setting is to prohibit the outdoor unit fan speed adjustment with Fo setting. When the function is set to 0, the function is not activated so the fan speed adjustment can be done (Fo setting). ✓...
  • Page 98 4.4 External input and output setting External input / output setting items (7 segment symbol: E.io) Installation setting item 7 segment display Description No setting Fixing heating operation mode (initial setting) Input 1 connector (Terminal No.) CN17 (1-2) 14 No setting No setting Fixing cooling operation mode (initial Input 2 connector (Terminal No.) CN17 (2-3)
  • Page 99 4.5.1 Check mode It is used to check the condition of the outdoor and indoor units. It also displays the last 15 items in the alarm code history. It is mainly used for servicing. Start setting Exit setting Press PSW1 for 3 seconds Press PSW1 for 3 seconds 4.5.2 External input and output setting It is used to set the functions by external input and output signals.
  • Page 100 External input and output setting (by 7-segment display) 4.6.1 Available control functions The outdoor unit PCB1 has three input terminals (CN17, CN18) that receive external signals and two output terminals (CN16) that send signals to the exterior. The control functions are available by setting the input and output terminals as shown below: Control function number Setting of input functions...
  • Page 101 NOTE The same input/output function cannot be assigned to different input/output terminals. In such case, the setting of the higher terminal number would become invalid. 4.6.2 Setting of external input and output If the initial setting has to be modified, the following instructions must be followed: 1 Selecting “External input and output setting”...
  • Page 102 Refer to the "Specifications of required main parts" table for the details for the electrical wiring connection and the required parts. Specifications of required main parts Components Specifications Remarks Mini power relay, MY1F (or MY2F) Auxiliary relay (X1, X2) 230V made by OMRON Changeover switch (SS2, SS3) Manual switch...
  • Page 103 Setting example: • Fixing heating operation at input 1 (between 1 and 2 pins of CN17) • Fixing cooling operation at input 2 (between 3 and 2 pins of CN17) 3-pin connector Outdoor unit PCB1 Control circuit Power source Auxiliary relay (cool) Auxiliary relay (heat) SS3.
  • Page 104 Operating example: • Short-circuit terminals 1 and 2 (input 3) of CN18 to set the stoppage demand. • Short-circuit terminals 1 and 2 (input 3) of CN18 to set the stoppage forced. • The stoppage code is number 10. By disconnecting the demand switch contact, restarting is available.
  • Page 105 Setting example: Outdoor fan motor start/stop at input 2 (between 2 and 3 pins of CN18) 3-pin connector Outdoor unit PCB1 Control circuit Power source Auxiliary relay SS3. Snow sensor switch ◆ Demand current control of 40, 60, 70, 80 and 100   ...
  • Page 106 ◆ Low noise setting 1, 2, 3 (Control function n° 11 to 13)    When the input terminals for low noise setting of the outdoor unit PCB1 are short-circuited, the frequency of the compressor and the fan rotation frequency are controlled and the outdoor unit operating sound is within the values shown in the table below: The sound operation can be adjusted by selecting the control function number.
  • Page 107 Example: “Low noise setting 2” during night time only: Capacity Operating sound Day time schedule Night time schedule Input terminal short-circuited 82 (Catalogue value) [dB(A)] 72.5 [dB(A)] Parts Specifications Remarks Mini-Power relay (model MY1F or MY2F) Auxiliary relay (X1, X2) 220/240V made by OMRON Change-over switch (SS2, SS3)
  • Page 108 ◆ Operation signal (Control function n°1)    This function is used to receive the operation signal. The auxiliary contact relay (RYa) is closed during the operation. The operation signal is sent to output terminals when the indoor units (or a single indoor unit) are operating. This function can be used for the circulation or humidification operation.
  • Page 109 ◆ Compressor ON signal (Control function n°3)    This function is used to receive the compressor operation signal. The auxiliary contact relay (RYa) is closed during the compressor operation. Compressor ON Signal at Output 2 (between 1 and 3 pins of CN16). Setting example: Compressor ON Signal at Output 2 (between 1 and 3 pins of CN16).
  • Page 110 4.7 Function setting (by 7-segment display) 4.7.1 Sequence of the function setting This setting must be carried out during stoppage of the outdoor unit. For a combination of outdoor units, set it to the main outdoor unit. (The setting cannot be performed to sub outdoor units.) The main outdoor unit is the unit to which the communication cable between the outdoor unit and indoor unit is connected.
  • Page 111 PIN4 ON PIN5 ON Circulator function at heating Thermo-OFF Minimum Indoor expansion valve evaporating opening change temperature for Thermo-OFF setting for cooling Indoor unit (Heating mode) Indoor expansion valve initial opening Night-Shift of Thermo-ON Compressor Indoor unit frequency (Heating mode) control target Pd correction value for heating...
  • Page 112 Demand Indoor expansion Not Prepared function valve opening setting minimum limitation change for stoppage indoor unit in heating mode Thermo-OFF setting for outdoor unit after defrosting operation Not Prepared Wave Function Setting Crankcase heater control during Not Prepared Turning OFF operation switch Forced defrosting during stoppage...
  • Page 113 Compressor maximum frequency Not Prepared suppression Covert unit in checking mode Not Prepared Indoor fan Compressor ON/OFF setting maximum during forced frequency stoppage change during defrosting mode Not Prepared Not Prepared Not Prepared Not Prepared Not Prepared Not Prepared Not Prepared Not Prepared 3 After selecting the Function Setting, turn OFF DSW4 PIN5.
  • Page 114 4.7.2 Function setting 7-Segment display Setting item Contents SEG2 SEG1 No setting Indoor unit fan forced ON and OFF (2 min. ON / 6 min. OFF) Circulator function at Indoor unit fan forced ON and OFF (2 min. ON / 13 min. OFF) heating thermo-OFF Indoor unit fan forced ON and OFF (2 min.
  • Page 115 7-Segment display Setting item Contents SEG2 SEG1 Initial setting (Pd targeted value 0.00(MPa)) Pd targeted value -0.15(MPa) Pd targeted value -0.10(MPa) Compressor frequency Pd targeted value -0.05(MPa) control target Pd correction value for Pd targeted value -0.03(MPa) heating Pd targeted value +0.03(MPa) Pd targeted value +0.05(MPa) Pd targeted value +0.10(MPa) Initial setting (SH targeted value +0 °C)
  • Page 116 7-Segment display Setting item Contents SEG2 SEG1 Initial setting Fine adjustment of Heating operation initial opening -5 % indoor expansion valve Heating operation initial opening +3 % initial opening in heating Heating operation initial opening +5 % mode Heating operation initial opening +10 % Initial setting Fan rotation maximum limit 1 Fan rotation maximum limit 2...
  • Page 117 7-Segment display Setting item Contents SEG2 SEG1 No setting Total compressor operation time: 500 h / Manual FrostWash (outdoor PCB) Total compressor operation time: 1000 h / Manual FrostWash (outdoor PCB) 25 FrostWash interval Total compressor operation time: 500 h / Time zone scheduled or manual FrostWash (outdoor PCB) Total compressor operation time: 1000 h / Time zone scheduled or manual FrostWash (outdoor PCB)
  • Page 118 7-Segment display Setting item Contents SEG2 SEG1 Initial setting (expansion valve opening 100 pulse) Expansion valve opening 150 pulse Indoor expansion ealve Expansion valve opening 200 pulse initial opening for heat recovery cooling Expansion valve opening 250 pulse (heat recovery type Expansion valve opening 300 pulse only) Expansion valve opening (corrected based on the indoor unit capacity...
  • Page 119 ◆ Record settings    Fill out the selected function setting number in the space of the table as shown (SET). Item SEG2 SEG1 Circulator function at Heating Thermo-OFF Night-shift Cancellation of outdoor ambient temperature limit Defrost for cold area (change of defrost condition) SLo (Fan speed) defrost setting Cancellation of hot start H...
  • Page 120 Item SEG2 SEG1 Thermo-OFF setting for outdoor unit after defrosting operation FrostWash interval Crankcase heater control during turning OFF operation switch Changing of OFF time for indoor unit fan during turning ON heating operation switch Intermittent operation of outdoor fan motor Indoor heat exchanger SH target value control for cooling (only for RCI-FSN4 series) Indoor expansion valve opening minimum limitation change for...
  • Page 121 Item SEG2 SEG1 Not prepared Not prepared Not prepared Not prepared Not prepared Not prepared Dedicated Outdoor Air System (for NA market only) 4.7.3 Circulator function at heating Thermo-OFF (FA) Press PSW3 and select the setting of the condition “0” to “4” of the indoor unit fan control during the Thermo-OFF in heating mode “FA”.
  • Page 122 4.7.4 Night-shift (low noise)(ni) Press PSW3 and select the setting for condition “1” of the night shift (low noise) “ni” consequently, the function can be set. “ni”=1 reduces the upper limit of the outdoor fan rotation and the compressor frequency as shown below. The night shift operation shall be applied in case the cooling capacity has the allowed range to decrease the capacity and the low noise level operation is required especially at night.
  • Page 123 4.7.5 Cancellation of the outdoor ambient temperature limit (GS) Press PSW3 and select the setting condition “0” to “3” at the cancellation of outdoor ambient temperature limit of G5. Then this function can be set. The heating operation is continued under a high outdoor temperature or the cooling operation is continued under a low temperature.
  • Page 124 ◆ Cooling operation    The limitation of the permissible outdoor temperature area in cooling operation (factory-set) as shown in the right figure is cancelled. Indoor Inlet Air Operation Temperature (°C) stoppage area Outdoor Temperature (°C) NOTE • When the outdoor ambient temperature limit for cooling operation is cancelled, the operation may stop due to decreasing low pressure since the protection control is not cancelled.
  • Page 125 4.7.7 SLo defrost setting (bJ) Press PSW3 and select the settings condition “0” to “4” at the SLo defrost setting “bJ” . The indoor fan stops during the defrost operation and starting of heating operation. However, the indoor fan can operate at low speed during the defrosting operation and starting of heating operation.
  • Page 126 4.7.9 Low noise setting (db) Press PSW3 and select the setting condition “0” to “9” at the low noise setting “db” to reduce the upper limit compressor frequency and the outdoor fan motor rotation frequency. NOTE • By setting this function, the compressor frequency and the outdoor fan motor rotation frequency are forcibly reduced and so the outdoor unit capacity decreases and the unit operation range is limited.
  • Page 127 4.7.10 Demand function setting(dE) Press PSW3 and select the settings for conditions “0” to “5” to set the demand function “dE”. This function is available by setting to “1” for the demand current control without inputting the signal to the external input terminal on the outdoor unit PCB1. The table below is shown for the limit of the operating current for this function.
  • Page 128 4.7.11 Wave function setting (UE) Press PSW3 and select the settings condition “0” to “4” to set wave function setting “UE”. The maximum running current limit changes from 40 % to 80 %, as shown in the attached figure. NOTE In the case that the demand current control by external input is set and the external input signal is available,this function is not available even when the demand current control by external input signal is performed.
  • Page 129 4.7.12 Cold draft protection (Fb) Press PSW3 and select the setting condition “0” to “3” to set the cold draft protection “Fb”. When the indoor unit discharge air temperature drops falls down at cooling operation, the outdoor unit fan stops and the compressor frequency decreases to prevent a drop in discharge air temperature.
  • Page 130 4.7.14 Alternate defrosting function (L) Select the setting condition "1" for the Alternate Defrost Enable “ ” to defrost alternately multiple refrigerant systems connected to H-LINK II. Until one refrigerant system completes defrosting, other refrigerant system will not start defrosting. NOTE •...
  • Page 131 DANGER • With this setting, the outdoor fan can operate even while the outdoor unit (compressor) stops. • Display a notice to that effect on a readily visible part of the unit body, in order to avoid injuries caused by an unintended outdoor fan operation. 4.7.16 FrostWash (F1) The FrostWash function prevents clogging of the indoor units heat exchanger.
  • Page 132 Start FrostWash FrostWash completed Approx. Approx. 3 min. to 25 min. Max. 6 min. 3 min. 5 min. Indoor unit 1 Preparation Freezing Defrosting Drying Stop Automatically Indoor unit 2 Preparation Freezing Defrosting Drying Stop Automatically Indoor unit 3 Stop (Disabled or not equipped with the function.)
  • Page 133 Setting the FrostWash function The FrostWash function is deactivated at the factory. The detail of the function by setting condition is shown in the following table Auto FrostWash Manual FrostWash "F1" setting "Interval" time duration Start-up timing Operation condition Factory setting (Default): FrostWash disabled Total Comp.
  • Page 134 system, set it on all wired controllers connected in the system. The FrostWash function is not available on the indoor unit if its setting is "OFF". *2: When the setting on the main wired controller is "Disabled" for "Enable/Disable Auto FrostWash" setting, the FrostWash function is not performed on all indoor units connected in the system.
  • Page 135 3 Function 3: Manual FrostWash command from main wired controller Main wired controller Sub wired controller Outdoor unit Enable/ Auto Enable/ Auto Main wired Frostwash FrostWash "F1" setting Operation disable Auto FrostWash Disable Auto FrostWash controller interval interval condition FrostWash schedule FrostWash schedule...
  • Page 136 When select "Function 3": Manual FrostWash command from Main Wired Controller a. Select "FrostWash Setting" from the Function Menu on the main wired controller screen and press "OK". b. Select "FrostWash Started" and press "OK". c. Select "Yes" and press "OK" when appear "Start FrostWash Now?" on the screen. NOTE Refer to the Installation and Operation Manual of the Wired Remote Controller for further information.
  • Page 137 ✓ During the freezing or defrosting phase, cracking noise may be heard due to the temperature change. Refrigerant flow noise may also be heard. ✓ The noise may be heard relatively louder in a quiet environment. It is recommended to set "Auto FrostWash Schedule"...
  • Page 138 ✓ Operating conditions: Ambient temperature: 35 °C ◉ Room temperature: 28 °C ◉ Outdoor unit nominal cooling capacity: 28kW ◉ Indoor units nominal cooling capacity: 14kWx2 ◉ Pipe length: 7.5 m ◉ Maximum power consumption: 2.0kWh/1 FrostWash Cycle ◉ 4.7.17 Minimum evaporating temperature setting for cooling (Hc) By controlling the rotation speed of the compressor so that the evaporating temperature of the refrigerant flowing through the indoor unit, during refrigeration operation, becomes the set target evaporating temperature.
  • Page 139 There are three Cool/heat auto changeover modes: ◆ Indoor unit majority vote    The number of indoor units requesting cooling operation and the number requesting heating operation are compared, so the operation mode is switched to the requested operation of the indoor units with the highest number of requests.
  • Page 140 ◆ Temperature demand analysis    The total temperature difference (Inlet temperature - Set temperature) of the indoor units requesting cooling operation and the temperature difference (Set temperature - Inlet temperature) of the indoor units requesting heating operation are compared, and the operation mode is switched to the requested operation from the indoor units with the largest total temperature difference.
  • Page 141 ◆ Lead unit priority    The operation mode switches to the operation mode requested by the indoor unit set as Lead unit priority. Cool/heat auto changeover disabled The operation mode of the outdoor unit can only be set as priority from the (Lead unit set from main WRC) main wired remote controller.
  • Page 142 Setting item Description Activate Auto Changeover Enable/Disable Cool/Heat Auto Changeover Changes Cool/Heat Auto Changeover modes: Select Changeover Option Temperature Demand Analysis, Indoor Unit Majority Vote, and Lead Unit Priority. Sets Cool/Heat Auto Changeover to the Lead Unit. Select Lead Indoor Unit When Select Lead Indoor Unit is selected in Select Changeover Option, the operation mode is determined based on the mode set in the Lead Unit.
  • Page 143 Select Changeover Option This function is used to change cool/heat auto changeover modes: Temperature demand analysis, indoor unit majority vote, and lead unit priority. Mode Description Determines the operation mode by the total temperature difference (Cooling setting: Indoor unit inlet air temperature - Indoor unit setting temperature, Temperature Demand Analysis Heating setting: Indoor unit setting temperature - Indoor unit inlet air temperature) of all units.
  • Page 144 Select Lead Indoor Unit 1 On the Service Menu screen, select “Cool/Heat Auto Changeover”. 2 Select “Select Lead Indoor Unit” and press the “OK” button. 3 Press the “ ” and “ ” buttons and select “Lead Unit”. Press the “ ” button to return to Step 2. 4 Use the “<“...
  • Page 145 Indoor Unit Voting Weight 1 On the Service Menu screen, select “Cool/Heat Auto Changeover”. 2 Select “Indoor Unit Voting Weight” and press the “OK” button. 3 Press the “ ” and “ ” buttons to change the options in the following order: “*1” <=> “*2” <=> “*3”...
  • Page 146 ✓ Supported advanced color wired remote controller PC-ARFG2-E System Configuration (Example) Supported Supported Not Supported Supported Supported Supported Not Supported Supported Receiver Kit PC-ARFG2 PC-ARFG2 PC-ARFG2 PC-ARFG2 Except PC-ARFG2 Except PC-ARFG2 PC-ARFG2 Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5 Disabled >...
  • Page 147 The "Power Savings Mode" changes as follows: "No setting" ↔ "Capacity Control" ↔ "Rotation Control" ↔ "Intermittent Control" When power savings is ON, power savings level is displayed to indicate the power savings setting ◆ Outdoor unit capacity control    The demand function setting can be controlled from wired controller.
  • Page 148 NOTE • The power set value (%) is just a criterion. The power set value for this function is different from the actual power value in precision. Use the demand controller (option) when it is necessary to manage the maximum power correctly. •...
  • Page 149 ◆ Rotation control function    Item Description Indoor units are set to fan mode in ascending order, one by one, depending on Address order their H-link address. Indoor units are set to fan mode according to the temperature difference between the temperature set point and the air inlet temperature, in ascending Temperature order Control order: units for which Tset is closer to the setting temperature are the first to...
  • Page 150 NOTE • It is possible to change the rotation assigned number according to the minimum differential between the setting temperature and indoor temperature. 4.8.2 Intermittent control function Item Description Level Change The power saving level can be set. The intermittent control repeats cooling/heating and fan (Thermo-OFF) mode in fixed intervals. 30 min 30 min Cooling operation...
  • Page 151 NOTE The fan mode will be repeated in the interval of five minutes (LOW), ten minutes (MED) and fifteen minutes (HIGH) during heating operation. Power Saving Schedule Function. ◆ Power Saving/Night Quiet Schedule Setting    This function starts and stops power savings control and operation noise reduction control at the desired time.
  • Page 152 Example of power saving operation and schedule setting Example of power saving and night quiet schedule operation The operation noise reduction schedule function is utilized to set the operation noise reduction schedule up to five settings a day each day of the week. NOTE The operation noise reduction setting may decreases the cooling/heating capacity.
  • Page 153 The power consumption for outdoor unit compressor will be displayed. Switch the comparison target for the display period, the display scale and press "OK" to switch between the graph and list display of the power consumption display. SMGB0147 rev.0 - 01/2024...
  • Page 154 Test run 5.1 Preliminary checks ..................146 5.2 Before the test run ..................147 5.3 Test run using the PC-ARFG2-E remote control ..........148 5.4 Test run from the outdoor unit ..............151 5.5 Checking at test run ..................153 5.6 Reset for accumulated operation time of compressor 1-2 (cU1-cU2) ..155 5.7 Setting of forced open valve mode ...............156 5.8 Refrigerant cycle checklist ................158 5.9 Test run check list ..................161 SMGB0147 rev.0 - 01/2024...
  • Page 155 5.1 Preliminary checks The test run must be performed according to the instructions in this chapter. DANGER Do not use the system until all the checkpoints have been verified. As with the test run for the indoor unit, check the Installation and maintenance manual for the indoor unit and the CH unit. •...
  • Page 156 5.2 Before the test run CAUTION • Disconnect all the power supply switches. • Use a multimeter and check that all the switches are disconnected. Before carrying out the test run, check that the unit is properly installed in accordance with the Installation and Operation Manual.
  • Page 157 * Insulation resistance In the case that the unit has been turned OFF for large periods of time, the insulation resistance may be reduced to 1 MΩ or less because the refrigerant is maintained in the compressor. Check the following points. •...
  • Page 158 3 The total number of the indoor units connected to the wired controller or to the system is indicated on the screen. (“2 units” is indicated for a twin combination, “3 units” for a triple, and “4 units” for a quad, etc.) 4 If the number of indoor units displayed on the screen is matching with the real quantity of units connected to this controller, the connection of remote control cable is correct.
  • Page 159 b. Checking procedure for abnormalities. Remote control switch Inspection points after the power Unit condition Fault indication source OFF 1. Connection between Connector and Wires The power source is not turned ON. 2. Connecting Points of Remote The connection of the remote control Control Cable cable is incorrect.
  • Page 160 6 Cancel “Test Run” Mode. ✓ When the unit is not in operation, press “ ”. ✓ When the unit is in operation, press “ ” (On/Off). 5.4 Test run from the outdoor unit The procedure of test run from the outdoor unit is indicated below. The setting of this DSW is available with power source ON.
  • Page 161 Setting the DSW Operation Remarks 1. Setting the operation mode. 1. The indoor unit Note that the indoor units operate automatically starts operating in conjunction with the test run when the test run of the operation of the outdoor unit. outdoor unit is set.
  • Page 162 When the test run operation is completed, turn all the switches of DSW4 OFF. 1 If the remote control switch is set to a different mode, the test run function will not start. In this case, perform the following actions before the test run. ✓...
  • Page 163 5 High pressure increase retry (protection control). a. The high pressure will increase when the following procedure is performed. Cover the air inlet of the outdoor unit Cover the air inlet of the indoor unit during during the cooling operation. the heating operation.
  • Page 164 5.6 Reset for accumulated operation time of compressor 1-2 (cU1-cU2) There are accumulated operation time of compressor after maintenance and after starting operation. The following procedure shows how to reset the accumulated operation time of compressor after maintenance. Perform it for each outdoor unit. ◆...
  • Page 165 5.7 Setting of forced open valve mode This system is equipped with “Refrigerant Recovery mode” where all the electric expansion valves and solenoid valves in the system will be open during refrigerant recovery. Refrigerant in all outdoor units can be recovered from the check joint from one outdoor unit. Heat pump 1 Turn on the power to the air conditioner.
  • Page 166 Heat recovery 1 Turn on the power to the air conditioner. 2 Switch the DSW4-4 pin on the outdoor PCB1 to the On position (forces compressor stop) 3 Press and hold the PSW4 (▼) switch for 3 seconds or more to move all electronic expansion valves and solenoid valves to the open position All electric expansion valves and solenoid valves will be open.
  • Page 167 5.8 Refrigerant cycle checklist The refrigerant cycle data can be checked on 7-segment of outdoor unit PCB during the test run and the troubleshooting. However, it may take time for the checking because the operation cycle changes depending on the operating condition. To check the quality of refrigerant cycle, the following check list shall be used at the test run, troubleshooting and emergency check.
  • Page 168 b. Data samples (cooling/heating, indoor temperature 21-30 °C). Check item Result Check the operating data after it has been operating for 20 minutes. Check Pd and Td. IsTd-SH between 15 and 45 °C? Is Ps between 0.15 and 1.3 MPa? Is Pd between 1.0 and 3.6 MPa? (If the outdoor temperature is high, Pd becomes high).
  • Page 169 b. Heating operation (this is applicable when the outdoor temperature is higher than 0 0C). Check item Standard Causes Result When TdSH “15 - 45 0C”, is the value of oE1 • Low: excessive refrigerant. (outdoor unit expansion valve) extremely •...
  • Page 170 ＰＣＮ９ ＰＣＮ８ ＰＣＮ６ ＰＣＮ７ Ｅ Ｌ３ ＦＣ４ ＪＰ１５ SEG2 SEG1 ＬＥＤ１ DSW4 DSW7 ＬＥＤ２ ＰＳＷ２ ＰＳＷ５ ＰＳＷ３ ＰＳＷ１ DSW3 DSW2 ＰＳＷ４ DSW8 DSW5 DSW6 ＴＰ ＩＣ１ DSW1 RSW7 ＣＮ３ ＣＮ１００ ＬＥＤ４ ＬＥＤ８ ＬＥＤ３ ＤＳＷ１０ ＣＮ４６ ＣＮ２９ ＴＨＭ２４ ＣＮ４ ＴＨＭ１２ ＴＨＭ１３ ＴＨＭ１４ ＴＨＭ１７ ＴＨＭ２３...
  • Page 171 6 Check the outdoor ambient temperature: Inlet DB ______°C WB ______°C Outlet DB ______°C WB ______°C 7 Check the temperature of the refrigerant: Discharge gas temperature Td = _____°C Liquid pipe temperature Te = _____°C 8 Check the pressure: Discharge pressure Pd = _____ MPa Suction pressure Ps = _____ MPa...
  • Page 172 Electrical checks of the main parts 6.1 Outdoor unit PCB (PCB1) ................165 6.1.1 Arrangement of connectors and check points ........165 6.1.2 Checking procedures for outdoor unit PCB1 ........166 6.2 Inverter (INV1, INV2) ..................167 6.2.1 Inverter specifications .................167 6.2.2 High voltage discharge work for replacing parts ........169 6.2.3 Checking method of inverter PCB (INV) ..........170 6.2.4 Protection function ................177 6.2.5 Overload protection control ..............179...
  • Page 173 6.5.5 Thermistor for the outdoor ambient temperature ......189 6.5.6  Thermistor for the evaporating temperature of the outdoor unit in the heating operation (For defrosting) ......190 6.5.7  Thermistor for super cooling bypass and main line temperature of outdoor unit ..............190 6.6 Electronic expansion valve (MV1, MV2, MVB)..........190 6.6.1 Specifications for MV1 and MV2 ............191 6.6.2 Specifications for MVB ................192 6.7 Pressure sensor (Pd) ..................193...
  • Page 174 6.1 Outdoor unit PCB (PCB1) 6.1.1 Arrangement of connectors and check points ＰＣＮ９ ＰＣＮ８ ＰＣＮ６ ＰＣＮ７ Ｅ Ｌ３ ＦＣ４ ＪＰ１５ LED 1 SEG1 SEG2 VCC13 ＬＥＤ１ VCC3. 3 VCC03 LED 2 VCC13 7-segment DGND DSW4 DSW7 ＬＥＤ２ display ＰＳＷ２ ＰＳＷ５ ＰＳＷ３ ＰＳＷ１...
  • Page 175 6.1.2 Checking procedures for outdoor unit PCB1 Investigate the cause of blown fuses. Check if the fuses (FC3, FC4) are Failure of high voltage devices, Then, replace the fuses (FC3, blown. such as the solenoid valve. FC4). Turn on the outdoor unit power source.
  • Page 176 6.2 Inverter (INV1, INV2) 6.2.1 Inverter specifications Inverter PCB (INV) DCL1 Inverter model INV 1 INV 2 RAS-(8-12)FSXNS2E RAS-(14-18)FSXNS2E air365Max RAS-(20/22)FSXNS2E RAS-24FSXNS2E Applicable models air365Max RAS-(5-10)FSXNP2E RAS-(12/14)FSXNP2E RAS-(16/18)FSXNP2E Applicable power 3N~ 400V 50Hz 3N~ 400V 50Hz source Maximum output 415V 415V voltage (Depends on power source voltage) (Depends on power source voltage)
  • Page 177 Current Rated Current of Transistor Module (IPM) Rated Current x 105% 10ms 50ms Time Abnormality code for inverter (iT) = 1 Protection function: Overcurrent protection 1 Short-Circuit trip of arm for Inverter 2 Instantaneous overcurrent trip Abnormality code for inverter (iT) = 2 3 Instantaneous overcurrent trip, when detecting current is more than rated current (8 - 12 HP: 106.1A, 14 - 18 HP: 141.4A) of transistor module, overcurrent is detected.
  • Page 178 6.2.2 High voltage discharge work for replacing parts CAUTION • Perform this high voltage discharge work to avoid an electric shock. • Take special care to avoid a short circuit between terminal P and N. ◆ Procedures    a. Turn OFF the main switches and wait for three minutes. Check to ensure that no high coltage exists.
  • Page 179 6.2.3 Checking method of inverter PCB (INV) ◆ Outer appearance and rectifier circuit of CIB    If procedures (a) to (d) are performed and the results are satisfactory, the CIB on the inverter PCB is normal. NOTE Recommended using an analogue tester. a.
  • Page 180 Measurement point Criterion Tester Item Analogue tester Digital tester 1kΩ or more R/S/T Over load (Measured range: 1kΩ) 30kΩ or more R/S/T 1.0V or less (Measured range: 10kΩ) 1kΩ or more R/S/T Over load (Measured range: 1kΩ) 30kΩ or more R/S/T 1.0V or less (Measured range: 10kΩ)
  • Page 181 a. By touching the + side of the tester to the DCL2 terminal of the inverter PCB and the - side of tester to U0, V0, and W0 of the DCL2 inverter PCB, measure the resistance. U0 V0 W0 b. By touching the - side of the tester to the DCL2 terminal of the inverter PCB and the + side of tester toU0, V0, and W0 of the DCL2...
  • Page 182 ◆ Testing the fuse for inverter power    By touching the + and - side of the tester on each side of the fuse (FC601), measure the resistance. If the resistance is 0Ω, it is normal. NOTE Set analog, or digital tester at 1kΩ. U1 V1 FC601 ◆...
  • Page 183 ◆ Testing the Capacitor    1 Check that the capacitor does not show signs of burns or isn’t swollen. 2 Measure the capacitance using the capacitance meter between the DCL2 and N2 terminal. If the capacitance is 2000mF+10 %, it is normal. Capacitance meter DCL1...
  • Page 184 b. Disconnect all the wirings connected to the inverter PCB (INV). U1 V1 W1 U2 V2 W2 DCL1 DCL2 c. By touching the + side of the tester to the DCL2 terminal of fan controller and the - side of tester to U1, V1, and W1 of the fan controller, measure the resistance.
  • Page 185 d. By touching the - side of the tester to the DCL2 terminal of fan controller and the + side of tester to U1, V1, and W1 of the fan controller, measure the resistance. U1 V1 W1 U2 V2 W2 DCL1 DCL2 e.
  • Page 186 f. By touching the + side of the tester to the N2 terminal of fan controller and the - side of tester to U1, V1, and W1 of the fan controller, measure the resistance. U1 V1 W1 U2 V2 W2 DCL1 NOTE In case of the outdoor unit is RAS-14FSXNS2E / RAS-(8-14)FSXNP2E , additional test will be required by...
  • Page 187 c. Cancellation of the protection function: The transmitted fault will be reset when outdoor unit power is cut off. ◉ 2 Abnormality of current sensor a. Level of detection: The wave height value of running current for the phase positioning is less than the ◉...
  • Page 188 5 Fin temperature increase a. Level of detection: When the temperature of internal thermistor exceeds 110 C, an abnormality is detected. ° ◉ b. Function: When abnormalities are detected, the inverter compressor is stopped and the signal code ◉ for the cause of the stoppage is transmitted to outdoor unit PCB1. c.
  • Page 189 6.2.6 Inverter failure diagnosis mode If alarm code 03, 48 or 53 occurs, use the inverter failure diagnosis mode to identify the failure location according to the following procedure. NOTE After completing the inverter failure diagnoses mode, be sure to perform steps3 and 4. Otherwise the aire conditioner cannot be operated after the faulty is restored because the compressor forced stop state is maintained.
  • Page 190 • Electrical parts are energized during the fault diagnosis. Make sure not to touch anything other than the DIP switch (DSW) and push switch (PSW). • If the inverter power module (IPM) is short-circuited, a loud noise may be generated. 6.3 Scroll compressor 6.3.1 Reliable mechanism for low vibration and low sound 1 The direction of rotation is definite.
  • Page 191 6.3.3 Structure The compressor has a structure for supplying oil from the outdoor oil separator. Inside the oil separator, the pressure is high and the surface temperature of the oil separator is between 60 °C and 110 °C just like the compressor. Suction pipe Injection pipe Discharge pipe...
  • Page 192 6.3.5 Checking of compressor motor Inverter compressor Resistance AA55PHDPA-D1Y2 0.229±7% Ω at 75 °C DC65PHDPA-D1Y2 0.171±7% Ω at 75 °C DA80PHDPA-D1Y2 0.209±7% Ω at 75 °C DD98PHDPA-D1Y2 0.167±7% Ω at 75 °C 6.3.6 Check list on compressor CLIENT:_______________________ MODEL:_______________________ DATE:_________________________ Serial No:______________________ Production date:________________ Checker:______________________ Check Item...
  • Page 193 Is opening of Check to ensure that liquid pipe temperature is lower than expansion valve fully air intake temperature of stopped indoor unit when the other opened (locked)? indoor units are operating under cooling operation. Are the relay on the main power PCB Check the main power PCB (PCB2).
  • Page 194 6.4 Fan motor (1-3/4) 102.5 (4-1/16) (3-1/16) (3/8) φ7 (4-φ1/4) (1/2) P1.5 (M10) (1-9/16) 51.6 (2-1/16) (9-5/8) (10-13/16) Model RAS-(8-12)FSXNS2E, RAS-(20-24)FSXNS2E 268.5 mm RAS-(5/6)FSXNP2E, RAS-(16/18)FSXNP2E RAS-(14-18)FSXNS2E 224.8 mm RAS-(8-14)FSXNP2E Power source Rated Rated Applicable model Electrical wiring diagram Resistance voltage voltage output RAS-(8-24)FSXNS2E...
  • Page 195 6.5 Thermistors 6.5.1 Thermistor positions for RAS-(8-12)FSXNS2E and RAS-(5/6)FSXNP2E Nº Name Te (THM10) - thermistor (Liquid evaporation line) Tpf (THM13) - thermistor (for supercooler Bypass inlet) Td (THM8) - thermistor (for discharge gas temperature) Tpb (THM14) - thermistor (for supercooler Bypass outlet) Tchg (THM17) - thermistor (Super-cooling main line) Tg (THM12) - thermistor (Gas evaporation line) Tsc (THM23) - thermistor (for super-cooler)
  • Page 196 6.5.2 Thermistor positions for RAS-(14-18)FSXNS2E and RAS-(8-14)FSXNP2E Nº Name Te1 (THM10) - thermistor (Liquid evaporation line) Tpf (THM13) - thermistor (for supercooler Bypass inlet) Te2 (THM11) - thermistor (Liquid evaporation line) Td (THM8) - thermistor (for discharge gas temperature) Tpb (THM14) - thermistor (for supercooler Bypass outlet) Tchg (THM17) - thermistor (Super-cooling main line) Tg (THM12) - thermistor (Gas evaporation line) Tsc (THM23) - thermistor (for super-cooler)
  • Page 197 6.5.3 Thermistor positions for RAS-(20-24)FSXNS2E and RAS-(16/18)FSXNP2E Nº Name Nº Name Te1 (THM10) - Thermistor Tpb (THM14) - Thermistor (Liquid evaporation line) (for supercooler Bypass outlet) Tpf (THM13) - Thermistor Tchg (THM17) - Thermistor (for supercooler Bypass inlet) (Super-cooling main line) Te2 (THM11) - Thermistor Tg (THM12) - Thermistor (Liquid evaporation line)
  • Page 198 6.5.4 Thermistor (Td) for discharge gas temperature 1 The thermistor for the temperature of the upper 250.0 part of the compressor is installed for the purpose of Thermistor Resistance (kΩ) Output Voltage (VDC) preventing discharge gas due to overheating. If the 200.0 200.0 discharge gas temperature increases excessively, the...
  • Page 199 6.5.6  Thermistor for the evaporating temperature of the outdoor unit in the heating operation (For defrosting) The thermistor resistance characteristics are the same as in the outdoor ambient temperature thermistor. 6.5.7  Thermistor for super cooling bypass and main line temperature of outdoor unit The thermistor resistance characteristics are the same as in the outdoor ambient temperature thermistor.
  • Page 200 6.6.1 Specifications for MV1 and MV2 Items Specifications Models PAM-BBOYGHS-1 (MV) Working temperature range -30 °C to 70 °C Refrigerant used R410A Insulation resistance Min. 100MΩ (at 500VDC Megohmmeter) Withstand voltage 500VAC for 1 minute or 600VAC for 1 second Rated voltage DC 12V±1.2V Drive condition 100 - 200 PPS 2-2 phase excitation...
  • Page 201 6.6.2 Specifications for MVB Items Specifications Models UKV-U029E or UKV-A027 Working temperature range -30 °C to 70 °C Refrigerant used R410A Insulation resistance Min. 100MΩ (at 500VDC Megohmmeter) Withstand voltage 1800VAC for 1 second Rated voltage DC 12V±1.2V Drive condition 83±5 PPS 1-2 phase excitation Coil resistance (for each phase) 46±3Ω...
  • Page 202 ◆ Checking method of electronic expansion valve    Outdoor unit electronic expansion valve Locked It is abnormal if the liquid pipe pressure does not increase during cooling operation. (fully closed) Locked It is abnormal if the liquid pipe pressure does not increase and the outlet temperature of (slightly open) the expansion valve decreases after the cooling operation is started.
  • Page 203 6.7.2 Low pressure control The suction pressure is detected during the cooling operation by means of a low pressure sensor and the compressor frequencies are controlled by the proportional control method with operating capacity of the indoor units (or PID control for the compressor frequency); therefore, the suction pressure is controlled within an appropriate range.
  • Page 204 6.8 High pressure protection device (PSH) If the discharge pressure is excessively high, the compressor and the refrigerant cycle components may be damaged. However, if the discharge pressure is higher than 4.15 MPa (R410A), the protection control is activated and the compressor will stop. Example: RAS-8FSXNSE TCHG Inverter compressor...
  • Page 205 6.9 Electrical coil parts ◆ Solenoid valve (SVA)    Applicable model Electrical coil model Resistance Coil FQ-A0520D 2142±214Ω at 20 0C Body FDF5A11 RAS-8FSXNS2E to 24FSXNS2E RAS-5FSXNP2E to 18FSXNP2E Coil TEV-SM0AJ2066A1 2496±174.7Ω at 20 0C Body TEV-S2020DQ50 ◆ Reversing valve (RVR)   ...
  • Page 206 NF161 NOTE All measurements are in mm. NF202S SMGB0147 rev.0 - 01/2024...
  • Page 207 6.11 Reactor (DCL1 and DCL2) This part is used to change the alternating current to direct current for the inverter. Items Specifications Model DCL1 DCL2 Character 1.0mH+15 %, -10 % (at 1KHz) Rated current Coil internal temperature is less than 170 0C Direct current 28mΩ±20 % (20 0C) 17mΩ±20 % (20 0C)
  • Page 208 6.12 CH-Box PCB (PCB1) 6.12.1 Check points PCB1 of single type CH-Box CN12 VDC13 VDC15-1 CN11 PCN1 GND1 VCC15 VDC- 6.12.2 Check points PCB1-4 of multi type CH-Box Vcc5 EF161 EF141 VDC- EF121 EF101 GND1 CN10 EF301 Vcc5 PCN2 PCN1 Vcc13 SMGB0147 rev.0 - 01/2024...
  • Page 209 6.12.3 Specifications for MVD1 and MVS1 Items Specifications Models PAM-MD12HS-17 - PAM-MD12HS-26 Working temperature range -30 °C to 70 °C Refrigerant used R410A Insulation resistance Min. 100MΩ (at 500VDC Megohmmeter) Withstand voltage 500VAC for 1 minute or 600VAC for 1 second Rated voltage / operating voltage DC 12V±1.2V Driving current...
  • Page 210 Blue Orange Yellow White View from D Appearance Blue Orange Yellow White SMGB0147 rev.0 - 01/2024...
  • Page 211 Servicing 7.1 Removing the front covers ................204 7.1.1 Removing service front cover ..............204 7.1.2 Removing bottom front cover .............205 7.1.3 Removing front right cover..............205 7.2 Removing the electrical box covers ...............206 7.2.1 Removing the electrical box cover ............206 7.3 Removing the electrical box ................206 7.3.1 Removing the electrical box ..............207 7.3.2 Reassembling the electrical box ............209 7.4 Removing the fan grill ..................210...
  • Page 212 7.9.4 Removing the stop valve ..............234 7.10 Removing the PSH, high and low pressure sensors and thermistors ...235 7.10.1 High pressure switch, high/low pressure sensor position and thermistors ...................235 7.10.2 Removing the high pressure switch (PSH1, PSH2) ......237 7.10.3 Removing the high pressure (Pd) and low pressure (Ps) sensor ..237 7.11 Removing the pipe thermistor ..............238 7.12 Removing the ambient temperature thermistor ..........239 7.13 Removing other electrical components ............240...
  • Page 213 7.1 Removing the front covers DANGER Turn OFF all the power source switches. NOTE • For servicing use Phillips screwdriver tool. • When fitting and removing the covers take care not to get injured with the edges of the cover. 7.1.1 Removing service front cover 1 Remove the 6 screws from the service cover.
  • Page 214 7.1.2 Removing bottom front cover 1 Remove the service front cover. 2 Remove the 2 screws from the front piping cover. 3 Remove the 6 screws from the bottom cover and remove it pulling to back. 4 Remove the 2 lower screws from the front piping cover and remove it. Bottom cover Screw Screw...
  • Page 215 7.2 Removing the electrical box covers DANGER Turn OFF all the power source switches. NOTE • For servicing use Phillips screwdriver tool. • Take care not get injured with the edges of the front cover when removing the electrical box cover.
  • Page 216 7.3.1 Removing the electrical box NOTE Two people are required to perform this operation, due to the weight of the electrical box. 1 Remove the front covers as described in the procedure “7.1 Removing the front covers”. 2 Remove the electrical box cover as described in the procedure “7.3.1 Removing the electrical cover”.
  • Page 217 CAUTION Hold the electrical box by the corners to avoid deforming the electrical box. RAS-(8-12)FSXNS2E RAS-(14-18)FSXNS2E RAS-(5/6)FSXNP2E RAS-(8-14)FSXNP2E Cord clamp Cord clamp (7 portions) (12 portions) RAS-(20-24)FSXNS2E RAS-(16/18)FSXNP2E Cord clamp (12 portions) SMGB0147 rev.0 - 01/2024...
  • Page 218 7.3.2 Reassembling the electrical box 1 Check to ensure that the tube end of waterproof vinyl pipe and the connectors are in the electrical box. Fix them firmly with a cord clamp when wiring. 2 Fix the wiring connecting each electrical part and the electrical box with a plastic band to avoid direct contact with the compressor, piping and plate edges.
  • Page 219 7.4 Removing the fan grill DANGER Turn OFF all the power source switches. NOTE For servicing use Phillips screwdriver tool. 1 Remove the screws that attach the fan grill. 2 Lift the upper cover upward. Air outlet grille Screw Fan shroud RAS-(8-12)FSXNS2E RAS-(14-18)FSXNS2E RAS-(5/6)FSXNP2E...
  • Page 220 7.5 Removing the fan of the outdoor DANGER Turn OFF all the power source switches. NOTE For servicing use the following tools: adjustable wrench, spanner, puller, Phillips screwdriver, nippers, box wrench. 1 Remove the air grille as described in the procedure “7.2 Removing the fan grill”.
  • Page 221 RAS-(8-12)FSXNS2E, RAS (5/6)FSXNP2E: CN801 from INV1 RAS-(14-18)FSXNS2E, RAS-(8-14)FSXNP2E: CN801 and CN901 from INV1 RAS-(20-24)FSXNS2E, (16/18)FSXNP2E: CN801 fom INV1 and CN801 from INV2. SMGB0147 rev.0 - 01/2024...
  • Page 222 c. Then cut the plastic tie fixing the piping insulation. d. Remove four M6 bolts fixing the fan motor, and remove the fan motor. Fan motor E-Box E-Box Cord clamp for fixing fan lead wiring Plastic tie Cord clamp for fixing fan lead wiring RAS-(8-12)FSXNS2E, RAS-(5/6)FSXNP2E: 4 screws (x1 motor).
  • Page 223 b. Check that the pressure of the refrigerant cycle does not increase at this time. If the pressure increase, this means that the refrigerant collection has not been completed. c. Refer to the item “5.7 Setting of forced open valve mode” and collect all the refrigerant in the refrigerant cycle.
  • Page 224 Thermistor Holder Td thermistor Removing the Td thermistor Pull it out Crankcase heater 7 Remove the terminal box cover for the compressor and disconnect the wiring to the compressor terminals. 8 Check the terminals numbers and the mark band numbers. ✓...
  • Page 225 NOTE • All the pipes are connected by brazing. When applying the burner to the pipe connections, the oil adhered inside the pipes may burn. So clear flammable materials around the compressor before the work. • Burner work under applying gas pressure is very dangerous. Make sure to cut the pipes first before burner work.
  • Page 226 NOTE • When removing the compressor, take special care not to touch with the surrounding pipes. If contacted, the pipes may be deformed. • Take special care not to be injured with the sheet metal edges while working. • When removing the compressor fixed with the oil discharge pipe, seal the pipe end with tapes so that the refrigerant oil remaining inside the compressor will not spill out from the oil discharge pipe.
  • Page 227 CAUTION • When attaching the nut at the front side, take care not to deform the oil discharge pipe. • When mounting the new compressor on the base, take special care not to contact the piping. If contacted, piping may be deformed. 17 File away brazing material remaining on the end of the refrigerant pipes.
  • Page 228 Injection pipe Brazing Suction pipe Suction pipe Wet cloth for cooling Suction and discharge pipe removed from compressor High pressure switch (PSH) Discharge pipe Brazing Discharge pipe File away the brazing material remaining on the end of the suction and discharge pipes. Oil discharge pipe Piping diameter (refrigerant cycle side) Thickness of...
  • Page 229 • Check that the high pressure switch (PSH) does not contact the compressor cover aluminium sheet. • Attach the crankcase heater firmly to the compressor and fix it with springs as shown in the figure. • If there is clearance between the crankcase heater and the compressor due to wire overlapping, excessive heat will be generated there.
  • Page 230 ◆ RAS-(8-12)FSXNS2E, RAS-(5/6)FSXNP2E    Td thermistor wire Td thermistor (Td1) (Td1) High Pressure switch wire (PSH) Crankcase heater wire (CH1) High pressure switch wire (PSH1) Compressor wire (MC1) C-Cover (2) [After Attaching C-Cover (2)] Secure high pressure switch wire (PSH1) with cable clamp on C-Cover (2) Secure Td thermistor wire (Td1) and high pressure...
  • Page 231 ◆ RAS-(14-24)FSXNS2E, RAS-(8-18)FSXNP2E    Td thermistor wire (Td1) Td Thermistor wire (Td1) High Pressure switch wire (PSH) Crankcase heater wire High pressure switch (CH1) (PSH) Compressor wire (MC1) C-Cover (2) [After Attaching C-Cover (2)] Secure high pressure switch wire (PSH) with cable clamp on C-Cover (2) Secure Td thermistor wire (Td1) and high pressure...
  • Page 232 7.7 Replacing the refrigerant oil DANGER Turn OFF all the power source switches. NOTE For servicing use the following tool: adjustable wrench or spanner. 7.7.1 No clogging in return oil circuit 1 Remove the front service cover as described in the procedure “7.1 Removing the front covers”.
  • Page 233 9 After recharging, open the stop valves. (B) Low pressure gas stop valve NOTE (A) High/low pressure • Use a clean charge hose. gas stop valve • Charge the refrigerant oil in a short period of time (approximately 20 minutes). Use a container with a small opening so the refrigerant oil does not absorbe the moisture in the atmosphere.
  • Page 234 5 Cut off (G) return oil circuit with (I) accumulator pipe at Detail of cutting the cutting position 1. position 1: All models 6 Cut off (G) return oil circuit with (H) oil separator at the point indicated in position 2. Remove (G) return oil (K)Return oil circuit circuit from the unit.
  • Page 235 ◆ RAS-(8-12)FSXNS2E / RAS-(5-6)FSXNP2E    (G) Return oil circuit (J) Brazing for unit pipe (I) Unit pipe (L) Brazing for oil separator outlet (H) Oil separator ◆ RAS-(14-18)FSXNS2E / RAS-(8-14)FSXNP2E    (G) Return oil circuit (J) Brazing for unit pipe (I) Unit pipe (L) Brazing for oil separator outlet...
  • Page 236 7.8 Removing the coils DANGER Turn OFF all the power source switches. NOTE For servicing use the following tools: pliers, wet cloth, charging hose, pipe cutter, Phillips screwdriver, adjustable wrench or spanner, burner, pincher. 7.8.1 Coil position ◆ RAS-(8-12)FSXNS2E / RAS-(5-6)FSXNP2E   ...
  • Page 237 ◆ RAS-(20-24)FSXNS2E / RAS-(16-18)FSXNP2E    SVX2 RVR2 SVX2 Solenoid valve coil RVR1 RVR1 Reversing valve coil RVR2 Expansion valve coil Metal tie 7.8.2 Removing the expansion valve coil (MV1, MV2, MVB) DANGER • There is a risk of electrocution due to residual voltage. •...
  • Page 238 Position of lock feature after rotated Normal position of lock feature Lock feature Stopper Coil Rotate Body When assembling the parts, reverse de removal procedure. The electronic expansion valve coil has a locking feature. Once installated, rotate it and make sure that it clicks into the slot in the electronic expansion valve.
  • Page 239 7.8.4 Removing the reversing valve coil (RVR1, RVR2) 1 Remove the screw from the reversing valve coil with a Phillips screwdriver. If the screw is difficult to remove, use an adjustable wrench or spanner. 2 Remove the reversing valve coils. Reversing valve coil Screw Front view 7.9 Removing the valves...
  • Page 240 Expansion valve body (MVB) Expansion valve body (MV1, MV2) Brazing part Brazing part Strainer 6 The positions of expansion valves (MV1, MV2, MVB) are shown in the item “7.8 Removing the coils”. NOTE • During brazing work, cover the solenoid valves with wet cloth for cooling. •...
  • Page 241 SVX2 Brazing part Brazing part Brazing part Removing SVA Removing SVX2 Removing SVG NOTE • During brazing work, cover the solenoid valves with wet cloth for cooling. • Take special care not to burn the connecting wiring and the piping insulation during brazing work.
  • Page 242 8 Cover the reversing valves with wet cloth for cooling. 9 Remove the brazing of the reversing valve assembly as shown in the following order: a. Brazing at the right and left branch pipes of the three pipes coming from the reversing valve. b.
  • Page 243 7.9.4 Removing the stop valve NOTE For servicing use the following tools: pliers, burner, Phillips screwdriver, wet cloth. 1 Remove the front service cover as described in the procedure “7.1 Removing the front covers”. 2 Close the high/low pressure gas stop valve, low pressure gas stop valve and liquid stop valve. 3 Collect the outdoor unit refrigerant from the low pressure check joint and the high pressure check joint.
  • Page 244 7.10 Removing the PSH, high and low pressure sensors and thermistors DANGER Turn OFF all the power source switches. NOTE For servicing use the following tools: adjustable wrench or spanner, Phillips screw driver, burner. 1 Remove the front covers as described in the procedure “7.1 Removing the front covers”.
  • Page 245 RAS-(14-18)FSXNS2E, RAS-(8-14)FSXNP2E Tpb thermistor Td1 thermistor Tchg thermistor (Super cooling main line) Tpf thermistor PSH1 (High pressure switch) thermistor thermistor Tg thermistor thermistor (Low pressure sensor) (High pressure sensor) Details of the centre of heat exchanger RAS-(20-24)FSXNS2E, RAS-(16-18)FSXNP2E Tg thermistor Tpb thermistor Td2 thermistor Tpf thermistor...
  • Page 246 7.10.2 Removing the high pressure switch (PSH1, PSH2) 1 Close the gas stop valve and the liquid stop valve. 2 Collect the outdoor unit refrigerant from the low pressure check joint and the high pressure check joint. a. Check that the pressure of the refrigerant cycle does not increase at this time.
  • Page 247 7.11 Removing the pipe thermistor DANGER Turn OFF all the power source switches. NOTE Seal whole circumference • For servicing use the following tools: wet cloth, burner, pliers, with cork tape Phillips screwdriver, nippers. • When removing the thermistor of the liquid pipe, take care not to cause damage to your hands or the thermistor with the valve stay fixing the stop valve.
  • Page 248 7.12 Removing the ambient temperature thermistor DANGER Turn OFF all the power source switches. NOTE For servicing use the following tools: Phillips screwdriver, nippers. 1 Remove the front service cover and the upper service cover as described in the procedure “7.1 Removing the front covers”.
  • Page 249 7.13 Removing other electrical components DANGER • Turn OFF all the power source switches. • Do not touch any electrical component if the LED201 (Red) of the PCB2 is ON. Otherwise, an electric shock will occur. 1 Remove the front service cover as described in the procedure “7.1.1 Removing service front cover”.
  • Page 250 ◆ Removing the electrical components from the electrical box    1 Disconnect all the wirings connected with the electrical components. 2 Remove the screws fixing the electrical components. NOTE • Do not touch the electrical components on the outdoor unit PCBs while LED (red) of the PCB is ON to avoid electrical shock.
  • Page 251 ◆ RAS-(8-12)FSXNS2E - RAS-(5/6)FSXNP2E    Removing the screws fixing the electrical components to the electrical box. Name Units ＰＣＮ９ ＰＣＮ８ ＰＣＮ６ ＰＣＮ７ Ｌ３ Ｅ ＦＣ４ Electrical box ＪＰ１５ Terminal block Noise filter (NF) SEG2 SEG1 ＬＥＤ１ VCC3. 3 VCC03 VCC13 DGND Holder DSW4...
  • Page 252 Removing the power wiring connected to each electrical component. Quantity of Name power wiring connectors Inverter PCB (INV) Reactor Control PCB1 Noise filter (NF) Terminal block 1 (TB1) : Fixing screw for wire (M5) SMGB0147 rev.0 - 01/2024...
  • Page 253 ◆ RAS-(14-18)FSXNS2E - RAS-(8-14)FSXNP2E    Removing the screws fixing the electrical components to the electrical box. Name Units Name Units ＰＣＮ９ ＰＣＮ８ ＰＣＮ６ ＰＣＮ７ Ｅ Ｌ３ Electrical box Control PCB ＦＣ４ ＪＰ１５ Terminal block Fuse Noise filter Spacer SEG2 SEG1 ＬＥＤ１...
  • Page 254 Removing the power wiring connected to each electrical component. Quantity of Name power wiring connectors Inverter PCB (INV) Reactor Control PCB1 Noise filter (NF) Terminal block 1 (TB1) : Fixing screw for wire (M5) SMGB0147 rev.0 - 01/2024...
  • Page 255 ◆ RAS-(20-24)FSXNS2E - RAS-(16-18)FSXNP2E    Remove the screws fixing the electrical components to the electrical box. Name Units Name Units ＰＣＮ９ ＰＣＮ８ ＰＣＮ６ ＰＣＮ７ Ｅ Ｌ３ Electrical box Control PCB1 ＦＣ４ ＪＰ１５ Terminal block Fuse Noise filter Spacer SEG1 SEG2 ＬＥＤ１...
  • Page 256 Remove the power wiring connected to each electrical component. Quantity of Name power wiring connectors Inverter PCB (INV) Reactor Control PCB1 Noise filter (NF) Terminal block 1 (TB1) : Fixing screw for wire (M5) SMGB0147 rev.0 - 01/2024...
  • Page 257 7.13.2 Removing the inverter PCB 1 Disconnect all the wirings connected to the U0, V0, W0, CN206, CN207, PCN801, PCN901, PCN2, CN1, PCN331 and PCN332. 2 Disconnect all the terminal blocks on the Inverter PCB. DCL1, DCL2, R, S and T. 3 After removing screws, remove the inverter PCB.
  • Page 258 7.13.3 Location of the fuses on electrical components DANGER • Turn OFF all the power sources switches. • Do not touch any electrical components while LED401 or LED501 (Red) of inverter PCB is ON. Otherwise, it may lead to an electrical shock. The following example illustrate a small electrical box.
  • Page 259 7.14 Removing components for CH-Box DANGER Turn OFF all the power source switches. NOTE • For servicing use the following tools: Phillips screwdriver. • When attaching / removing the front service cover, take special attention to be not injured with the plate edges.
  • Page 260 CH-AP16MSSX Service cover for electrical box: 5 screws Service cover for electronic expansion valve: 3 screws Service cover for electronic expansion valve Electrical box cover 7.14.2 Removing the electrical components NOTE For servicing use the following tools: Phillips screwdriver, long-nose pliers, nippers. ◆...
  • Page 261 CH-AP04MSSX, CH-AP08MSSX, CH-AP12MSSX, CH-AP16MSSX 1 Remove all the wirings connected to the electrical components. 2 Remove the communication wirings connected to the terminal block (TB2). 3 Remove the screws securing the electrical components. NOTE When reassembling the electrical components, match the terminal Nos. with the mark band Nos. and also match the colors of the connectors on the PCB with the colors of the connector for wiring.
  • Page 262 CH-AP04MSSX Pinch here with longnose plier to remove the CH-Box PCB Cross section Board holder CH-Box PCB Board holder Electrical box Electrical box PCN1 PCN2 EFR1 EFS1 LED10 LED11 LED12 LED13 LED14 LED4 LED5 LED6 LED7 LED15 DSW1 DSW2 DSW3 LED16 CN11 LED17...
  • Page 263 CH-AP12MSSX Pinch here with longnose plier to remove the CH-Box PCB. Cross section CH-Box PCB Board holder CH-Box power supply Electrical box Securing screw (M4) for Board holder Board holder Board holder wiring of terminal block (TB1) PCN1 PCN2 PCN1 PCN2 PCN1 PCN2...
  • Page 264 7.14.3 Removing electronic expansion valve coil 1 Remove the front service cover as described in the procedure “7.1 Removing the front covers”. 2 Removing Electronic Expansion Valve (MVD1~4, MVS1~4): a. Turn the electronic expansion valve coil. Remove the electronic expansion valve coil bracket from the electronic expansion valve slot.
  • Page 265 CH-AP160SSX, CH-AP280SSX Wire clip Cord band MVS1 MVD1 Cord band Electrical box CH-AP04MSSX CH-AP08MSSX Cord band Wire clip Cord band Wire clip Wire clip MVD1 MVD1 MVD2 MVD3 MVD4 MVD2 MVD3 MVD4 MVD1 MVD2 MVD3 MVD4 Cord band MVS1 MVS2 MVS3 MVS4 MVS2...
  • Page 266 CH-AP16MSSX Cord band Cord band Cord band Wire clip Wire clip Wire clip Wire clip MVD1 MVD2 MVD3 MVD4 MVD1 MVD2 MVD3 MVD4 MVD1 MVD2 MVD3 MVD4 MVD1 MVD2 MVD3 MVD4 Cord band MVS1 MVS3 MVS4 MVS2 MVS3 MVS4 MVS3 MVS4 MVS2 MVS3...
  • Page 267 Troubleshooting 8.1 Initial troubleshooting ...................260 8.1.1 Checking the electrical wires and the power source ......260 8.1.2 Checking by 7-segment display ............261 8.1.3 Checking of the alarm code history ............262 8.1.4  E mergency mode operation from the remote control .......268 8.1.5  Emergency mode operation from the outdoor unit PCB1 for compressor failure ................269 8.1.5.1  F or combination of outdoor units ..........269 8.1.5.2  F or outdoor units without combination .......271 8.1.6 Failure of the power supply to indoor units and the remote control switch ....................273 8.1.7 Abnormal transmission between remote control switch and indoor unit 8.1.8 Abnormal operation of the devices ............275 8.2 Procedure for troubleshooting ..............286 8.2.1 Alarm codes of wired controller ............286 8.2.2 Alarm code CH-Box ................291 8.3 Troubleshooting by alarm code ..............292 8.4 Troubleshooting by using the 7-segment display .........368 8.4.1 Before carrying out checks ..............368 8.4.2 Location of the pushswitches and the 7-segment display ....368...
  • Page 268 8.5 RSW, DSWs and LEDs functions ..............386 8.5.1 Outdoor unit ..................386 8.5.1.1 Location of print circuit boards (PCBs) ........386 8.5.1.2 Purpose ...................386 8.5.2 CH-Box ....................389 SMGB0147 rev.0 - 01/2024...
  • Page 269 8.1 Initial troubleshooting 8.1.1 Checking the electrical wires and the power source Item to check Check method Is the power source Check the voltage (secondary side) of the breaker and using a tester, check the breaker or the fuse conductivity of the fuse. blown out? Is the transformer's Remove the transformer's secondary connection and check the voltage using a...
  • Page 270 8.1.2 Checking by 7-segment display (*) All the indoor (*)Turn on all indoor units units connected to the outdoor unit Turn on the outdoor unit During auto-addressing, the following items can be checked using the outdoor unit’s on-board 7-segment LED display. Auto-addressing starts (1) Disconnection of power supply to the indoor unit.
  • Page 271 8.1.3 Checking of the alarm code history Alarm code history is indicated in the following order while the check mode is displayed. “no01” (latest) history data ~ “no15” (oldest) history data Refer to the figure below as an example. The alarm code is displayed only on PCB1 of the outdoor unit A.
  • Page 272 Applicable compressors and fan motors During abnormal code (alarm or retry code) occurrence Example: RAS-54FSXNS2E Outdoor unit A Outdoor unit B Outdoor unit C Outdoor unit D Number of compressors and fan motors Inverter Inverter Inverter Inverter Inverter Inverter Inverter Inverter compressor compressor...
  • Page 273 Alarm code history indication Cause of stoppage Alarm code Contents Alarm Abnormal (alarm code or Time Outdoor Compressor data stoppage code) unit No. Incorrect setting of the main Accumulated outdoor unit time Abnormality high pressure Accumulated sensor time Abnormality of thermistor for Accumulated outdoor air temperature time...
  • Page 274 Alarm code history indication Cause of stoppage Alarm code Contents Alarm Abnormal (alarm code or Time Outdoor Compressor data stoppage code) unit No. Accumulated time Abnormality of low compression ratio Accumulated d1-11 time Accumulated time Abnormality of low pressure increase Accumulated d1-12 time...
  • Page 275 Alarm code history indication Cause of stoppage Alarm code Contents Alarm Abnormal (alarm code or Time Outdoor Compressor data stoppage code) unit No. Activation of overcurrent Accumulated protection time Abnormality of a fan controller Accumulated sensor time Detection of external Accumulated abnormality time...
  • Page 276 ◆ Deletion of the alarm code history    Press PSW1 and PSW3 for five seconds to delete the alarm code history while it is shown on the display (the entire history can be deleted). PSW4(▼) PSW2(▲) In order to delete all the history, press PSW1 and PSW3 ( ) for 5 seconds while history is displayed.
  • Page 277 8.1.4  Emergency mode operation from the remote control For models RAS-(26-96)FSXNS2E and RAS-(20-54)FSXNP2E only. If the compressor fails, the emergency mode operation is available from the remote control. Even if the compressor fails, the operation of the air conditioner is continuously available until the troubleshooting and problem resolution procedure is carried out.
  • Page 278 ◆ Operating condition    The emergency operation is not applicable to the outdoor unit whose compressor has failed. NOTE • The emergency operation is only available when all the indoor units and the connected remote controllers are H-LINKII. • The emergency operation is only available when the alarm codes shown in the previous table are displayed.
  • Page 279 ◆ Alarm code    The number of the failed outdoor unit, the number of the failed compressor and the alarm code are displayed on 7-segment of the outdoor unit PCB1. Alarm code Unit number of the failed compressor Unit number of the failed outdoor unit ◆...
  • Page 280 8.1.5.2  For outdoor units without combination For models RAS-(20-24)FSXNS2E and RAS-(16/18)FSXNP2E only. ◆ Alarms corresponding to inverter compressor failure    Inverter compressor failure Alarm code Description of the failure Abnormal transmitting between inverter PCB and outdoor unit PCB1 Abnormality of inverter voltage Abnormality of discharge gas thermistor Activation of overcurrent protection device Abnormality of inverter current sensor...
  • Page 281 5 Start operation using the remote control switch. NOTE • Not all the compressors in the failed outdoor unit will stop the operation. If two compressors are stopped simultaneously, the stoppage cause is supposed to be d1-30. • Measure the insulation resistance of the Inverter compressor. Do not activate the emergency operation when the insulation resistance is 0 Ω.
  • Page 282 8.1.6 Failure of the power supply to indoor units and the remote control switch • The lights and the LCD are not indicated. • Inoperative. If the fuses are blown or the circuit breaker is activated, investigate the cause of the excessive current and take the necessary measures.
  • Page 283 8.1.7 Abnormal transmission between remote control switch and indoor unit • The RUN indicator on the remote control: Flashes every two seconds. Action Phenomenon Cause Check item (Turn OFF main switch) Check cables and Disconnection or contact failure of controller cable Replace or repair them connection Check it in self-checking...
  • Page 284 8.1.8 Abnormal operation of the devices In the case no anomalies are detected (alarm codes) in the remote control switch, and normal operation is not available, carry out the required actions in accordance with the procedures described below. Action Phenomenon Cause Check item (Turn OFF main switch) Disconnected...
  • Page 285 Action Phenomenon Cause Check item (Turn OFF main switch) Check setting condition of “Thermistor of remote control switch” by optional setting *Setting and control: In case that thermistor of “00”: Control by indoor Incorrect optional setting remote control switch is thermistor for suction air not used, set at “00”...
  • Page 286 Action Phenomenon Cause Check item (Turn OFF main switch) Failure of thermistor Failure of Check thermistor in check discharge air Replace or correctly connect mode of remote control temperature wiring when it is abnormal switch (*) Disconnected thermistor wire of thermistor Indoor fan speed is not changed...
  • Page 287 Action Phenomenon Cause Check item (Turn OFF main switch) Indoor heat load is larger than Use larger unit Calculate heat load cooling capacity Gas leakage Correctly charge refrigerant or shortage of Measure superheat after repairing gas leakage refrigerant Excessively small diameter Measure and check field- Use correct pipes tube or long...
  • Page 288 Action Phenomenon Cause Check item (Turn OFF main switch) Check clogging of outdoor Remove clogging unit heat exchanger Obstacles at inlet or outlet of outdoor unit heat Remove obstacles Insufficient air exchanger? flow to outdoor unit heat exchanger Is service space for outdoor Secure service space unit sufficient? Replace fan motor...
  • Page 289 Action Phenomenon Cause Check item (Turn OFF main switch) Transmission failure Check indoor unit Repair it according to alarm between indicating alarm code “03” code “03” indoor unit on wired controller and outdoor unit Insufficient Repair it according to Check wired controller Insufficient Transmission power supply...
  • Page 290 Action Phenomenon Cause Check item (Turn OFF main switch) Indoor Heat Load is greater than Calculate heat load Use a bigger unit Heating capacity Gas leakage or insufficient Correctly charge refrigerant Measure superheat refrigerant after repairing gas leakage charge Excessively small Measure field-supplied Use correct pipes...
  • Page 291 Action Phenomenon Cause Check item (Turn OFF main switch) Transmission failure Check indoor unit between Repair it according to indicating alarm code “03” indoor unit alarm code “03” on wired controller and outdoor unit Check wired controller Repair it according to Insufficient Insufficient Transmission...
  • Page 292 Action Phenomenon Cause Check item (Turn OFF main switch) Remove clogging Check for filter clogging Insufficient air Check for any obstacles at flow to indoor inlet or outlet of indoor Remove obstacles unit heat unit exchanger Check indoor fan speed Replace fan motor Excessively high air...
  • Page 293 Action Check item Phenomenon Cause (Turn OFF main switch) Foreign particles inside of fan casing Remove foreign particles Check it by viewing Indoor unit fan runner is hitting Check it by viewing Adjust position of fan runner casing Outdoor unit propeller fan is hitting Check it by viewing Adjust position of propeller fan shroud...
  • Page 294 Action Cause / Check item Phenomenon (Turn OFF main switch) “Motion sensor is activated” is NOT indicated on wired Check connection of connector Connect it securely controller LCD Check reaction rate (Check mode 1:q1) Replace motion sensor (reaction rate is always 0 %: abnormal) Operation stops though someone is present Check connection of connector...
  • Page 295 8.2 Procedure for troubleshooting 8.2.1 Alarm codes of wired controller PC-ARFG2-E(B) example A: The RUN (red) indicator flashes. B: The alarm indicator appears on the remote controller liquid crystal display (LCD). The alarm screen displays the following items: ✓ C+D: Indoor unit number: C: Refrigerant system number (Abnormal refrigerant cycle number).
  • Page 296 Code Category Content of abnormality Leading cause Activation of float switch (high water level in drain Activation of protection device Indoor unit pan, abnormality of drain pipe, float switch, or (float switch) drain pan) Activation of protection device Activation of PSH (pipe clogging, excessive Outdoor unit (high pressure cut) refrigerant, inert gas mixing)
  • Page 297 Code Category Content of abnormality Leading cause Abnormality of fan controller fin Abnormality of fin thermistor or fan controller, temperature heat exchanger clogging, abnormality of fan motor Activation of overcurrent protection Abnormality of fan motor Indoor fan Problem with current sensor Abnormality of fan controller current sensor controller Driver IC error signal detection, instantaneous...
  • Page 298 Code Category Content of abnormality Leading cause Activation of pressure ratio Defective compression (failure of compressor or decrease protection inverter, loose power supply connection) Overload at cooling, high temperature at heating, Activation of low pressure increase expansion valve locking at open position (loose protection connector) Protection...
  • Page 299 Code Category Content of abnormality Leading cause 2 or more CH-Boxes are connected between Incorrect CH-Box connection outdoor unit and indoor unit 9 or more indoor units connected to single branch Incorrect indoor unit connection type CH-Box number 7 or more indoor units connected per a branch of multiple branch type CH-Box CH-Box Incorrect indoor unit refrigerant...
  • Page 300 8.2.2 Alarm code CH-Box The alarm code is indicated by LED on the CH-Box PCB: LED10 LED11 LED12 LED13 LED10 LED11 LED12 LED13 Alarm Content of abnormality code Abnormal transmission between single branch type CH-Box and outdoor unit Abnormal transmission between single branch type CH-Box and indoor unit There are 2 or more single branch type CH-Box are connected between the outdoor and indoor units There are 7 or more indoor units connected to multiple branch type CH-Box...
  • Page 301 8.3 Troubleshooting by alarm code Alarm code Activation of the indoor unit protection device (float switch) in indoor unit. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the LCD, and the indoor unit number and the alarm code are displayed on the 7-segment display of outdoor unit PCB.
  • Page 302 Action Phenomenon Cause Check item (Turn OFF main switch) Clogging of Check drain pan Remove foreign particles drainage Activation of High drain level Check drainage by clogging the drainage float switch up-slope drain pouring water piping Check conduction when Replace float switch Failure if failure drain level is low...
  • Page 303 Alarm code Activation of the outdoor unit protection device. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the outdoor unit number and the alarm code are displayed on the 7-segment display of outdoor unit PCB.
  • Page 304 Action Cause Phenomenon Check item (Turn OFF main switch) Clogging of heat exchanger? Remove clogging Remove dust Check for dust on air filter Insufficient air flow to heat exchanger (Outdoor heat Activation of high Check for any obstacles pressure switch due exchanger during cooling at inlet or outlet of heat Remove obstacles...
  • Page 305 Alarm code Abnormal transmitting between indoor units and outdoor units. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 306 Is LED1 (red) and LED2 Is voltage between “L1” Check CH-Box wiring (red) on CH-Box PCB and “N” of PCN1 on CH-Box PCB 230V? Is the fuse for CH-Box Is LED4 (green) on Replace fuse PCB melted? CH-Box PCB flashing more than once in 10 seconds? Faulty CH-Box PCB...
  • Page 307 NOTE • Before performing the flowchart, check that the crankcase heater of the compressor is energized. • Refer to item “6.2.6 Inverter failure diagnosis mode” for how to diagnose the inverter. Start troubleshooting of Inverter PCB (INV). Check the compressor Replace the inverter Check outdoor unit PCB Inverter PCB (INV)
  • Page 308 Action Check item Phenomenon Cause (Turn OFF main switch) Power failure of No power supply Measure voltage by tester Supply power Remove cause of short Check for breakage of Short circuit between wires circuit. Replace fuse and/or insulation IU/OU PCB if faulty Remove cause of short circuit Measure insulation to ground.
  • Page 309 Alarm code Abnormal transmission between Inverter PCB and the outdoor unit PCB1. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 310 Action Phenomenon Cause Check item (Turn OFF main switch) Between outdoor Check continuity of wires unit PCB1, inverter PCB Disconnected wires, Check for looseness of Replacing wires, repairing, contact failure or connection screws. tightening screws and incorrect connection Check terminal connection incorrect wiring Power source wiring for number.
  • Page 311 Alarm code Abnormal power source phase. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 312 Alarm code Abnormal Inverter voltage (Insufficient inverter voltage or over voltage). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 313 Alarm code Drop in discharge gas superheat. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 314 Continued from previous page Are the connectors (*2) of outdoor unit PCB1 of outdoor unit the heat Plug the connectors (*2) exchanger’s electric of outdoor unit PCB1 expansion valve properly connected properly? PCB1 Connector number is shown in (*2) the below table Charge correct Is refrigerant correctly refrigerant volume.
  • Page 315 Alarm code Increase in discharge gas temperature at the upper part of the compressor. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 316 Thermistor Model Td1 (THM8) Td2 (THM9) RAS-(8-18)FSXNS2E RAS-(5-14)FSXNP2E RAS-(20-24)FSXNS2E RAS-(16/18)FSXNP2E Action Cause Phenomenon Check item (Turn OFF main switch) Check refrigerant cycle Refrigerant cycle is different Repair wiring and the electrical system from the electrical system Undercharge of refrigerant Check pressures Correctly charge refrigerant Check expansion valve Replace expansion...
  • Page 317 Alarm code Abnormal transmission between outdoor units. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 318 Alarm code Incorrect outdoor unit address setting. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 319 Abnormal operation of thermistor for indoor unit inlet air temperature Alarm code (air inlet thermistor). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 320 Abnormal operation of thermistor for indoor unit discharge air temperature Alarm code (air outlet thermistor). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 321 Abnormal operation of thermistor for indoor unit heat exchanger liquid Alarm code refrigerant pipe temperature (freeze protection thermistor). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 322 Abnormal operation of thermistor for indoor unit heat exchanger gas refrigerant Alarm code pipe temperature (gas pipe thermistor). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 323 Abnormal operation of thermistor for outside air temperature Alarm code (for ducted with econofresh kit). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 324 Alarm code Abnormal operation of remote thermistor (for DOAS • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 325 Alarm code Abnormality of remote controller thermistor (for DOAS • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 326 Alarm code Abnormality of indoor fan system (Indoor unit with DC motor). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 327 Activation of the protection device for the indoor unit fan motor Alarm code (Indoor unit with DC motor). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 328 RPI(L/H)-FSR(1)E (PI161) CN14 RSW1 DSW5 DSW4 DSW3 DSW9 DSW6 RSW2 PC4-2 LED4 VCC05 VCC13 DSW7 GND1 VCC15 VDC- LED5 PCN7 EFR1 RCIM-FSRE (PI153) PCN7 LED5 (Red) I.U. PCB (PCB1) VCC05 LED4 (Red) RSW1 DSW5 VDC- VCC15 GND1 LED3 (Yellow) VCC13 PC4-No.
  • Page 329 Alarm code Activation of the protection device for the indoor unit fan motor (RPK models). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 330 RPK-(0.4-4.0)FSN(H)3M (PI121) PCN550 GND1 PC4-2 VCC12 VCC05 VCC15 PCN500 LED1 SMGB0147 rev.0 - 01/2024...
  • Page 331 Activation of the protection device for the indoor unit fan motor Alarm code (Indoor unit with AC motor). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 332 Alarm code Abnormality of fan controller fin temperature. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 333 Indoor unit fan controller stoppage codes When the indoor fan controller protection is activated, the stoppage code is displayed as “bc” on the wired controller inspection mode 1. Indoor unit fan controller Reason for Details stoppage stoppage code 1. A short circuit occurs in each U, V, W phase of the transistor module. Transistor module 2.
  • Page 334 Alarm code Activation of overcurrent protection. (1) • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 335 Alarm code Activation of overcurrent protection. (2) • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 336 Alarm code Problem with current sensor. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 337 Alarm code Activation fan controller protection. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 338 Alarm code Abnormality of indoor fan controller voltage. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 339 Alarm code Abnormal operation of the high pressure sensor of the outdoor unit. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 340 Abnormal operation of the thermistor for outdoor air temperature Alarm code (outdoor unit ambient thermistor). • The RUN indicator flashes and the ALARM indication is displayed on the remote control switch. • The unit number, the alarm code and the unit code are alternatively displayed in the temperature setting section and the unit number and alarm code are displayed on the outdoor unit's PCB1 display.
  • Page 341 Abnormal operation of thermistor for discharge gas temperature at the upper Alarm code part of the compressor. • The RUN indicator flashes and the ALARM indication is displayed on the remote control switch. • The unit number, the alarm code and the unit code are alternatively displayed in the temperature setting section and the unit number and alarm code are displayed on the outdoor unit’s PCB1 display.
  • Page 342 Abnormal operation of the thermistor for the outdoor unit heat exchanger liquid Alarm code pipe (Te/Tchg). • The RUN indicator flashes and the ALARM indication is displayed on the remote control switch. • The unit number, the alarm code and the unit code are alternatively displayed in the temperature setting section and the unit number and alarm code are displayed on the outdoor unit’s PCB1 display.
  • Page 343 Alarm code Abnormal operation of the thermistor for the outdoor unit heat exchanger gas pipe (Tg). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 344 Alarm code Abnormal operation of the low pressure sensor for the outdoor unit. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 345 Alarm code Incorrect connection of CH-Box. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code , the model name and the number of connected indoor units are displayed on the LCD.
  • Page 346 Alarm code Incorrect capacity setting of the outdoor and indoor unit. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 347 Alarm code Abnormal transmission between outdoor units. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 348 Alarm code Incorrect indoor unit number setting. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 349 Alarm code Abnormality of picking up circuit for protection in the outdoor unit. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 350 Alarm code Abnormal outdoor unit capacity. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 351 Alarm code Abnormal transmission between the main unit and the secondary unit(s). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 352 Alarm code Incorrect combination of outdoor unit inverter PCBs. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 353 Alarm code Activation of the low compression ratio protection device. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 354 Alarm code Activation of the low pressure increase protection device. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 355 Alarm code Activation of the high pressure increase protection device. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 356 Activation of the low pressure decrease protection device Alarm code (Vacuum operation protection). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 357 Action Phenomenon Cause Check item (Turn OFF main switch) Repair leakage and Check refrigerant charged Shortage of refrigerant correctly charge volume or check for leakage Closed stop valve Check stop valve Open stop valve Abnormal low or high Replace pressure Check connectors for pressure sensor sensor if faulty...
  • Page 358 Alarm code Activation of Inverter overcurrent protection device (1). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 359 Alarm code Activation of Inverter overcurrent protection device (2). Continued from previous page Is outdoor unit heat Remove the clog from the exchanger clogged? outdoor unit heat exchanger Is outdoor unit fan Replace the outdoor unit fan damaged? (Broken fan, etc.) Check the points below: Abnormal •...
  • Page 360 Alarm code Abnormal inverter current sensor. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 361 Alarm code Inverter error signal detection. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 362 Alarm code Inverter error signal detection (2). Continued from previous page Is outdoor unit heat Remove the clog from the exchanger clogged? outdoor unit heat exchanger Is outdoor unit fan Replace the outdoor unit fan damaged? (Broken fan, etc.) Check the points below: Abnormal •...
  • Page 363 Position of surge absorber NF161 Surge absorber (SA) Alarm code Abnormal inverter fin temperature. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 364 Alarm code Inverter failure. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 365 Alarm code Activation of fan controller protection. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 366 Alarm code Abnormal fan controller fin temperature. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 367 Alarm code Activation of fan controller overcurrent protection device (1). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 368 Alarm code Activation of fan controller overcurrent protection device (2). This alarm is indicated when the instantaneous overcurrent occurs 10 times in 30 minutes (retry operation is carried out up to 9 times). Activation conditions: • Electrical current with 105 % of the rated current runs continuously for 30 seconds. •...
  • Page 369 Alarm code Abnormal fan controller sensor. • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 370 Alarm code Compressor protection. This alarm code is displayed when any of the following alarms causing serious compressor damages occurs 3 times in 6 hours. While this alarm is displayed, alarm reset is unavailable. Indication on outdoor unit PCB1 Alarm code Alarm code Content of anomaly Activation of protection device (high pressure cut)
  • Page 371 Alarm code Incorrect setting of unit and refrigerant cycle number This alarm code is indicated in the following condition. Check the settings of the dip switch (DSW) and the rotary switch (RSW) after turning OFF the power source. Conditions Countermeasures: Unit number setting / refrigerant cycle number setting starting from “1”...
  • Page 372 Alarm code Incorrect indoor unit connection (CH-Box). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 373 Alarm code Incorrect indoor unit connection number setting (CH-Box). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code (“35”), the unit model code and the number of connected indoor units are displayed on the wired controller which is connected to the indoor unit with abnormal CH-Box.
  • Page 374 Alarm code Incorrect indoor unit connection (CH-Box). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code (“35”), the unit model code and the number of connected indoor units are displayed on the wired controller which is connected to the indoor unit with abnormal CH-Box.
  • Page 375 Alarm code Incorrect indoor unit connection (CH-Box). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the wired controller, and the alarm code is displayed on the 7-segment display of outdoor unit PCB.
  • Page 376 Alarm code Incorrect connection port setting (CH-Box). • The RUN indicator (Red) flashes on the wired controller. • The indoor unit number, the alarm code (“35”), the unit model code and the number of connected indoor units are displayed on the wired controller which is connected to the indoor unit with abnormal CH-Box.
  • Page 377 8.4 Troubleshooting by using the 7-segment display NOTE Only the authorized person can carry out checks using this method. The operating conditions and each part of the refrigerant cycle can be checked with the 7-segment display and push switches on the PCB1 in the outdoor unit. 8.4.1 Before carrying out checks 1 Turn ON the main power supply switch.
  • Page 378 8.4.3 Protection control code on the 7-segment display • A protection control code is displayed on the 7-segment display during the operation when the protection control has been activated. • A protection control code is displayed while the function is operating, and it is cancelled when it is released.
  • Page 379 Code during the Code Retry control degeneration control Pressure ratio decrease retry Low pressure increase retry High pressure increase retry Constant speed compressor overcurrent retry Discharge gas temperature increase retry / Low pressure decrease retry Without Discharge gas super-heat decrease retry Inverter anomaly retry Abnormal Inverter voltage retry / Inverter failure retry High pressure decrease retry...
  • Page 380 8.4.4 Activation condition of the protection retry control code The protection control or the retry control is carried out to prevent abnormal operation. The activation conditions are listed in the following table. Code Protection control Activation conditions Notes Compression ratio Ɛ≥8.5 Pressure ratio protection Ɛ=(Pd[MPa]+0.1)/ control...
  • Page 381 Code Retry control Activation conditions Notes When activating three times Pressure ratio decrease retry Pressure ratio Ɛ<1.5 over 1 minute in thirty minutes, alarm code "43" is indicated. When activating three times Low pressure increase retry Ps>1.80 MPa over 1 minute in thirty minutes, alarm code "44"...
  • Page 382 8.4.5 Check method by checking mode Operating conditions and each part of a system can be checked using the 7-segment display on the PCB1 in the outdoor unit. NOTE • Change the indication group by pressing PSW5 (◄) and PSW3 (►). Arrangement of Push switches (PSW) The first of the next or the previous indication group will be PSW2...
  • Page 383 ◆ Connection information    This information is indicated on unit A (main unit) only. Press PSW4 (▼) to move forward or PSW2 (▲) to move back. This information will be alternatively indicated as “Item” → “Details”. 7-segment display Item Details SEG2 SEG1 Total capacity of the combination of...
  • Page 384 ◆ Information for the outdoor unit    Select the outdoor unit combination number to be displayed only for the example of Unit A (number 0). Units B,C and D (numbers 1 to 3) show each unit number only. When changing the selection, press PSW3 (►) to move forward or PSW5 (◄) to move back. Select the outdoor unit combination number for indication.
  • Page 385 7-segment display Item Details SEG2 SEG1 (*1) Opening of the expansion valve Opening indication of the expansion valve MVB for MVB of the outdoor unit for the bypass indication (Unit: %) bypass Thermistor open circuit indication: 5.62 MPa Discharge pressure (High) Thermistor short-circuit indication: -0.62 MPa Thermistor open circuit indication: 2.25 MPa Suction pressure (Low)
  • Page 386 7-segment display Item Details SEG2 SEG1 (*1) Compressor MC2 accumulated Unit: hour (indication x 10 hours) operating time (*2) Unit: hour (Indication x 10 hours) Compressor MC1 accumulated operating time (resettable) The accumulated operating time can be reset. (*6) Unit: hour (Indication x 10 hours) Compressor MC1 accumulated operating time (resettable) (*2) The accumulated operating time can be reset.
  • Page 387 Capacity table for the outdoor units Indication Capacity (kW) Horsepower (HP) 14.0 16.0 22.4 28.0 10.0 33.5 12.0 40.0 14.0 45.0 16.0 50.4 18.0 56.0 20.0 61.5 22.0 67.0 24.0 73.0 26.0 77.5 28.0 NOTE In case of combination unit, the indication of outdoor unit capacity is total capacity of each unit. Example: In the case of 432 type: 432 type = 144 type x3...
  • Page 388 7-segment display Item Details SEG2 SEG1 (*1) Alarm cause code Indoor unit number indication. d Unit capacity indication. Capacity of the indoor unit Refer to the "Capacity table for the indoor units". Opening of the expansion valve Unit: % E Heat exchanger liquid pipe Unit: °C L...
  • Page 389 ◆ Cause for alarm code information    This information is indicated in unit A (main unit) only. Press PSW4 (▼) to move forward or PSW2 (▲) to go back. This information will be indicated alternating as “Item” → “Details”. Indication details: 7-segment display Item Details...
  • Page 390 ◆ Alarm code history information    This information is indicated in unit A (main unit) only. If a story of abnormality exists, it is indicated up to a maximum of a 15 instances in chronological order. Press PSW4 (▼) to move forward or PSW2 (▲) to go back. Press PSW3 (►) for detailed information.
  • Page 391 ◆ Communication board information    This information is displayed on outdoor unit A (Unit No. 0) only. Press PSW4 (▼) to move forward or PSW2 (▲) to go back. Press PSW3 (►) to move to the next unit No. Press PSW5 (◄) to return to the previous unit No Indication details: 7-segment display Item...
  • Page 392 ◆ Cause of indoor unit stoppage    Code Cause Code Cause Operation OFF, power OFF Retry due to inverter tripping Retry due to voltage decrease / Increase, other retry of Thermo-OFF inverter Alarm (Not always indicated) Expansion valve opening difference protection Freeze protection, overheating protection Forced thermo-OFF for oil return Instantaneous power failure at outdoor...
  • Page 393 ◆ Cause of inverter stoppage (check the item)    Code Cause Driver IC error signal detection Instantaneous overcurrent Inverter fin temperature increase Electronic thermal protection (inverter overcurrent) Inverter voltage decrease Inverter voltage increase Abnormal current sensor Instantaneous power failure detection Microcomputer reset Earth fault detection Open-phase detection...
  • Page 394 ◆ Cause of fan controller stoppage (Check the item F)    Code Cause Driver IC error signal detection Instantaneous overcurrent Fan controller fin temperature increase Electronic thermal protection (overcurrent) Abnormal current sensor Ground fault detection Reverse driving Fan controller malfunction Abnormal fan motor (step-out) Abnormal instruction frequency SMGB0147 rev.0 - 01/2024...
  • Page 395 8.5 RSW, DSWs and LEDs functions 8.5.1 Outdoor unit 8.5.1.1 Location of print circuit boards (PCBs) RAS-(8-12)FSXNS2E - RAS-(5/6)FSXNP2E RAS-(14-18)FSXNS2E - RAS-(8-14)FSXNP2E DCL1 DCL1 INV1 INV1 PCB1 PCB1 RAS-(20-24)FSXNS2E - RAS-(16-18)FSXNP2E DCL1 DCL2 INV1 INV2 PCB1 8.5.1.2 Purpose Symbol Purpose 1. Transmission between the indoor and outdoor units. 2.
  • Page 396 Printed circuit board for control: PCB1 ＰＣＮ９ ＰＣＮ８ ＰＣＮ６ ＰＣＮ７ Ｅ Ｌ３ ＦＣ４ ＪＰ１５ SEG2 SEG1 SEG2 SEG1 ＬＥＤ１ VCC3. 3 VCC03 VCC13 DGND DSW4 DSW7 ＬＥＤ２ ＰＳＷ２ LED1 ＰＳＷ５ ＰＳＷ１ ＰＳＷ３ DSW2 DSW3 LED2 ＰＳＷ４ DSW8 DSW5 DSW6 ＴＰ ＩＣ１...
  • Page 397 Inverter printed circuit board for control: INV1,2 DCL1 LED1 LED3 LED2 Part name Contents of functions Power source indicator for inverter PCB. LED2 (Orange) Normal condition: activated. Abnormal condition: not activated. This indicates the state of the microcomputer LED1 (Yellow) Normal condition: activated.
  • Page 398 8.5.2 CH-Box PCB1 of single branch type CH-Box LED13 LED12 LED11 LED10 DSW4 LED4 DSW5 LED1 LED2 PCB1-4 of multiple branch type CH-Box DSW8 DSW7 DSW6 DSW5 DSW3 DSW2 SMGB0147 rev.0 - 01/2024...
  • Page 399 Part name Contents of functions Power source indication for CH-Box PCB. LED1 (Red) (For AC Power supply) Power source indication for CH-Box PCB. LED2 (Red) (For DC Power supply) This indicates the state of communication between CH-Box and outdoor LED3 (Yellow) unit.
  • Page 400 Maintenance notes 9.1 Burnt-out compressor due to an insufficient refrigerant charge ....392 9.2 Alarm code "31" ....................392 9.3 N ot cooling well due to insufficient installation space for the outdoor unit 393 9.4 Maintenance work..................393 9.5 Service and maintenance table through the 7-segment display ....395 9.5.1 Information of connected outdoor/indoor capacity ......395 9.5.2 Information of outdoor unit ..............396 9.5.3 Information of Indoor unit ..............397 9.5.4 Information of cause code of alarm ............398 9.5.5 Information of cause code of alarm record ........398 9.6 Service and maintenance table through the remote control switch ...399 9.7 Service and maintenance table ..............401 9.8 Reference of normal operating pressure ............403 9.8.1 Standard type ..................403 9.8.2 High efficiency type ................412 9.9 How to collect refrigerant ................420 9.9.1  T he refrigerant collection method when replacing outdoor unit ..420...
  • Page 401 9.1 Burnt-out compressor due to an insufficient refrigerant charge Question and answer for the field work Example: Burnt-out compressor due to an insufficient refrigerant charge After commissioning, the alarm code “08” sometimes occurred and the compressors were Phenomenon burnt out after operating for two months. The refrigerant piping work was performed during the summer season, the additional refrigerant was not sufficiently charged from the discharge gas side.
  • Page 402 9.3 Not cooling well due to insufficient installation space for the outdoor unit Question and answer for the field work Example: Not cooling well due to insufficient installation space for outdoor unit Cooling operation was well performed through the intermediate season. However, the cooling Phenomenon operation was not well available when the outdoor temperature was higher than 35 °C.
  • Page 403 (E) Electrical equipment. ✓ Activation. Check the normal operation of the magnetic contactor, auxiliary relay, PCB, etc. ✓ State of the power supply line. Check the power supply, the current consumption (amperage) and the phase balance in particular. Check that there are no contact faults caused by loose terminals, rusty contacts, foreign objects or other causes.
  • Page 404 9.5 Service and maintenance table through the 7-segment display 9.5.1 Information of connected outdoor/indoor capacity Customer’s name: __________________________________________________ Date: _______________________ Outdoor unit model RAS- RAS- (Serial number: _________________________) (Serial number: ____________) (Serial number: _______________) 1. Operation mode 2. Start time of test run Total connection capacity of the outdoor unit Quantity of outdoor units...
  • Page 405 9.5.2 Information of outdoor unit Customer’s name: ________________________________________________________ Date: __________________ Outdoor unit model RAS- RAS- (Serial number: __________________________________) (Serial number: ________) (Serial number: _________) 1. Operation mode 2. Start time of test run 3. Start time of data collection 4. Read the data on the 7-segment display in the outdoor unit 5.
  • Page 406 Customer’s name: ________________________________________________________ Date: __________________ Outdoor unit model RAS- RAS- (Serial number: __________________________________) (Serial number: ________) (Serial number: _________) Compressor 1 Accumulated operating time of compressor (after reset) Compressor 2 Compressor 1 Compressor 2 Cause code of inverter stoppage DC fan 1 DC fan 2 9.5.3 Information of Indoor unit RAS-...
  • Page 407 9.5.4 Information of cause code of alarm 1. Test run start time 2. Data collect start time Alarm cause code Degeneracy control for pressure ratio decrease protection Degeneracy control for high pressure increase protection Degeneracy control for inverter fin temperature increase protection Degeneracy control for discharge gas temperature increase protection Degeneracy control for TdSH decrease protection Degeneracy control for overcurrent protection...
  • Page 408 9.6 Service and maintenance table through the remote control switch Data sheet for the checks using the remote control switch: Time IU model IU serial number IU number / Alarm code Check Check 1 · 2 1 · 2 1 · 2 1 ·...
  • Page 409 H PRESSURE AND FREQUENCY STATE INDICATION Discharge pressure Suction pressure Control information Operating frequency J INDICATION OF THE IU CAPACITY IU capacity (x 1/8 HP) OU code Refrigerant cycle number Refrigerant cycle number L EXPANSION VALVE OPENING IU expansion valve OU expansion valve 1 OU expansion valve 2 OU expansion valve B...
  • Page 410 9.7 Service and maintenance table Check item Action Judgement Is the service space sufficient? Is there a short circuit in the discharge air? Any heat influence? Is the earth wire connected? Refrigerant pipe Correct Incorrect Fixing of units Correct Incorrect Are the internal and external surfaces damaged? Are the screws and bolts tightened?
  • Page 411 Check item Action Judgement Indoor outlet air temperature DB/WB — _______ (°C) DB / (°C) WB Outdoor inlet air temperature DB/WB — _______ (°C) DB / (°C) WB Outdoor outlet air temperature DB/WB — _______ (°C) DB / (°C) WB High pressure switch —...
  • Page 412 9.8 Reference of normal operating pressure 9.8.1 Standard type ◆ RAS-8FSXNS2E    Cooling operation Piping length: 7.5m Piping length: 50m Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Indoor Unit Inlet Temperature (WB °C) Indoor Unit Inlet Temperature (WB °C) Heating operation Outdoor Unit Temp.
  • Page 413 ◆ RAS-10FSXNS2E    Cooling operation Piping length: 7.5m Piping length: 50m Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Indoor Unit Inlet Temperature (WB °C) Indoor Unit Inlet Temperature (WB °C) Heating operation Outdoor Unit Temp.
  • Page 414 ◆ RAS-12FSXNS2E    Cooling operation Piping length: 7.5m Piping length: 50m Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Indoor Unit Inlet Temperature (WB °C) Indoor Unit Inlet Temperature (WB °C) Heating operation Outdoor Unit Temp.
  • Page 415 ◆ RAS-14FSXNS2E    Cooling operation Piping length: 7.5m Piping length: 50m Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Indoor Unit Inlet Temperature (WB °C) Indoor Unit Inlet Temperature (WB °C) Heating operation Outdoor Unit Temp.
  • Page 416 ◆ RAS-16FSXNS2E    Cooling operation Piping length: 7.5m Piping length: 50m Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Indoor Unit Inlet Temperature (WB °C) Indoor Unit Inlet Temperature (WB °C) Heating operation Outdoor Unit Temp.
  • Page 417 ◆ RAS-18FSXNS2E    Cooling operation Piping length: 7.5m Piping length: 50m Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Indoor Unit Inlet Temperature (WB °C) Indoor Unit Inlet Temperature (WB °C) Heating operation Outdoor Unit Temp.
  • Page 418 ◆ RAS-20FSXNS2E    Cooling operation Piping length: 7.5m Piping length: 50m Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Indoor Unit Inlet Temperature (WB °C) Indoor Unit Inlet Temperature (WB °C) Heating operation Outdoor Unit Temp.
  • Page 419 ◆ RAS-22FSXNS2E    Cooling operation Piping length: 7.5m Piping length: 50m Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Indoor Unit Inlet Temperature (WB °C) Indoor Unit Inlet Temperature (WB °C) Heating operation Outdoor Unit Temp.
  • Page 420 ◆ RAS-24FSXNS2E    Cooling operation Piping length: 7.5m Piping length: 50m Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Indoor Unit Inlet Temperature (WB °C) Indoor Unit Inlet Temperature (WB °C) Heating operation Outdoor Unit Temp.
  • Page 421 9.8.2 High efficiency type ◆ RAS-5FSXNP2E    Cooling operation Piping length: 7.5m Piping length: 50m Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Indoor Unit Inlet Temperature (WB °C) Indoor Unit Inlet Temperature (WB °C) Heating operation Outdoor Unit Temp.
  • Page 422 ◆ RAS-6FSXNP2E    Cooling operation Piping length: 7.5m Piping length: 50m Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Indoor Unit Inlet Temperature (WB °C) Indoor Unit Inlet Temperature (WB °C) Heating operation Outdoor Unit Temp.
  • Page 423 ◆ RAS-8FSXNP2E    Cooling operation Piping length: 7.5m Piping length: 50m Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Indoor Unit Inlet Temperature (WB °C) Indoor Unit Inlet Temperature (WB °C) Heating operation Outdoor Unit Temp.
  • Page 424 ◆ RAS-10FSXNP2E    Cooling operation Piping length: 7.5m Piping length: 50m Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Indoor Unit Inlet Temperature (WB °C) Indoor Unit Inlet Temperature (WB °C) Heating operation Outdoor Unit Temp.
  • Page 425 ◆ RAS-12FSXNP2E    Cooling operation Piping length: 7.5m Piping length: 50m Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Indoor Unit Inlet Temperature (WB °C) Indoor Unit Inlet Temperature (WB °C) Heating operation Outdoor Unit Temp.
  • Page 426 ◆ RAS-14FSXNP2E    Cooling operation Piping length: 7.5m Piping length: 50m Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Indoor Unit Inlet Temperature (WB °C) Indoor Unit Inlet Temperature (WB °C) Heating operation Outdoor Unit Temp.
  • Page 427 ◆ RAS-16FSXNP2E    Cooling operation Piping length: 7.5m Piping length: 50m Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Indoor Unit Inlet Temperature (WB °C) Indoor Unit Inlet Temperature (WB °C) Heating operation Outdoor Unit Temp.
  • Page 428 ◆ RAS-18FSXNP2E    Cooling operation Piping length: 7.5m Piping length: 50m Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Outdoor Unit Temp. (DB °C) Indoor Unit Inlet Temperature (WB °C) Indoor Unit Inlet Temperature (WB °C) Heating operation Outdoor Unit Temp.
  • Page 429 9.9 How to collect refrigerant 9.9.1  The refrigerant collection method when replacing outdoor unit Process Procedure Remarks Turn OFF the main switch of outdoor unit. Connect manifold to the check joint at low and high pressure side in outdoor unit. Turn ON the main switch of outdoor unit.
  • Page 430 Process Procedure Remarks • When the refrigerant oil is collected from the Charge new refrigerant oil as the same quantity as accumulator or compressor, calculation for the collected refrigerant oil. recharge amount is required. Perform the vacuuming from the check joint at a low •...
  • Page 432 Hitachi certifies that our products have met EU consumer safety, health and environmental requirements. Johnson Controls-Hitachi Air Conditioning Spain, S.A.U. is certified with: ISO 9001 of AENOR, Spain for its Quality Management accordance with the standard. ISO 14001 of AENOR Spain for its Environmental Management systems accordance with the standard.

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