Mitsubishi Heavy Industries SRK20ZIX-S Service Manual
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Mitsubishi Heavy Industries SRK20ZIX-S Service Manual

Inverter wall mounted type and floor standing type room air-conditioner
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SERVICE MANUAL

INVERTER WALL MOUNTED TYPE
AND FLOOR STANDING TYPE
ROOM AIR-CONDITIONER
( Split system, air to air heat pump type )
Wall mounted type
SRK20ZIX-S
25ZIX-S
35ZIX-S
50ZIX-S
60ZIX-S
Manual No. '09 • SRK/SRF - SM - 082
updated 25,May,2009
Floor standing type
SRF25ZIX-S
35ZIX-S
50ZIX-S

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Summary of Contents for Mitsubishi Heavy Industries SRK20ZIX-S

  • Page 1: Service Manual

    Manual No. '09 • SRK/SRF - SM - 082 updated 25,May,2009 SERVICE MANUAL INVERTER WALL MOUNTED TYPE AND FLOOR STANDING TYPE ROOM AIR-CONDITIONER ( Split system, air to air heat pump type ) Wall mounted type Floor standing type SRK20ZIX-S SRF25ZIX-S 25ZIX-S 35ZIX-S 35ZIX-S 50ZIX-S 50ZIX-S 60ZIX-S...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS 1. WALL MOUNTED TYPE(SRK) ..............2 2. FLOOR STANDING TYPE(SRF) ............45 3. MAINTENANCE DATA ................69 3.1 Troubleshooting procedures for electrical equipment ....69 3.2 Servicing ..................90 4. REFRIGERANT PIPING INSTALLATION / SERVICING MANUAL FOR AIR CONDITIONERS USING R410A ..........91 4.1 Outline .....................91 4.2 Refrigerant piping installation ............92 4.3 Installation, removal and servicing ..........98...

  • Page 3: Wall Mounted Type(Srk)

    1. WALL MOUNTED TYPE(SRK) CONTENTS CONTENTS 1 RANGE OF USAGE & LIMITATIONS ..........1 2 INDOOR UNIT ..................3 Wall mounted type (SRK) ............3 1.1 Electrical wiring ..................3 Specifications ................3 1.2 Piping system ..................6 Exterior dimensions ..............8 1.3 Noise level .....................7 Electrical wiring .................
  • Page 4 Item Description CNE-CNY Connector Fan motor DISPLAY Flap motor WIRELESS RECEIVER CNX1 BACK-UP SW Louver motor Inlet motor PRINTED CIRCUIT Room temp. sensor BOARD Heat exch. sensor Humidity sensor （50,60 only） CNX2 Limit switch Diode stack Fuse Terminal block Varistor INTERFACE KIT SC-BIKN-E Color Marks...
  • Page 5 POWER SOURCE 1～220ｰ240V 50Hz／1～220V 60Hz Item Description Compressor motor CNEEV～20S Connector Electric expansion valve （coil） Fan motor Reactor Terminal block Heat exchanger sensor （outdoor unit） TERMINAL PWB ASSY Outdoor air temp.sensor BLOCK T1 T2 POWER Discharge pipe temp.sensor TRANSISTOR t゜ 250V 15A （BK）...
  • Page 6 POWER SOURCE 1～220ｰ240V 50Hz／1～220V 60Hz Item Description Compressor motor CNEEV～20S Connector Electric expansion valve （coil） Fan motor Reactor T1,2 Terminal block TERMINAL PWB ASSY （MAIN） PWB ASSY （SUB） Heat exchanger sensor （outdoor unit） BLOCK POWER TRANSISTOR FUSE Outdoor air temp.sensor （BK）...

  • Page 7: Indoor Unit

    1.2 Piping system Model SRK20ZIX-S, 25ZIX-S, 35ZIX-S Models SRK20ZIX-S,25ZIX-S,35ZIX-S Cooling cycle Heating cycle Indoor unit Outdoor unit Outdoor air Flare temp. sensor connection Service valve (TH2) (Gas) Discharge pipe temp. sensor Gas pipie Check joint Muffler Heat (TH3) (φ9.52) Room temp.

  • Page 8: Noise Level

    1.3 Noise level Model SRK20ZIX-S Condition ISO-T1,JIS C9612 (Indoor Unit) Model SRK20ZIX-S Cooling 39 dB(A) Noise Level Heating 38 dB(A) × ..Cooling, Heating N7 0 N6 0 N5 0 N4 0 N3 0 N 2 0 1000 2000 4000...
  • Page 9 Model SRK25ZIX-S Condition ISO-T1,JIS C9612 (Indoor Unit) Model SRK25ZIX-S Cooling 41 dB(A) Noise Level Heating 41 dB(A) × ..Cooling, Heating N 7 0 N 6 0 N 5 0 N 4 0 N 3 0 N 2 0 1000 2000 4000 8000...
  • Page 10 Model SRK35ZIX-S Condition ISO-T1,JIS C9612 (Indoor Unit) Model SRK35ZIX-S Cooling 43 dB(A) Noise Level Heating 42 dB(A) × ..Cooling, Heating N 7 0 N 6 0 N 5 0 N 4 0 N 3 0 N 2 0 1000 2000 4000 8000...
  • Page 11 Model SRK50ZIX-S Condition ISO-T1,JIS C9612 (Indoor Unit) Model SRK50ZIX-S Noise Cooling 45 dB(A) Level Heating 45 dB(A) × ..Cooling, Heating N7 0 N6 0 N5 0 N4 0 N3 0 N2 0 1000 2000 4000 8000 Mid Octave Band frequency (Hz) (Outdoor Unit) Model SRC50ZIX-S...
  • Page 12 Model SRK60ZIX-S Condition ISO-T1,JIS C9612 (Indoor Unit) Model SRK60ZIX-S Noise Cooling 47 dB(A) Level Heating 45 dB(A) × ..Cooling, Heating N7 0 N6 0 N5 0 N4 0 N3 0 N2 0 1000 2000 4000 8000 Mid Octave Band frequency (Hz) (Outdoor Unit) Model SRC60ZIX-S...

  • Page 13: Sensible Heat Capacity

    1.4 Sensible heat capacity Model SRK20ZIX-S Cool Mode Heat Mode Indoor air temp indoor air temp outdoor Outdoor 21•ŽDB 23•ŽDB 26•ŽDB 27•ŽDB 28•ŽDB 31•ŽDB 33•ŽDB Air - f ow air temp. Air f- o w 14•ŽW B 16•ŽW B 18•ŽW B 19•ŽW B...
  • Page 14 Model SRK50ZIX-S Cool Mode Heat Mode Indoor air temp indoor air temp outdoor Outdoor 21˚CDB 23˚CDB 26˚CDB 27˚CDB 28˚CDB 31˚CDB 33˚CDB Air flow air temp. Air flow air temp. 14˚CWB 16˚CWB 18˚CWB 19˚CWB 20˚CWB 22˚CWB 24˚CWB 16˚CDB 18˚CDB 20˚CDB 22˚CDB 24˚CDB -15˚CWB 3.69...

  • Page 15: Application Data

    1.5 Application data INSTALLATION DIRECTIONS R410A REFRIGERANT USED 　1.5.1 Installation of indoor unit WALL MOUNTED TYPE AIR CONDITIONER. This instruction manual illustrates the method of installing an indoor unit. RKY012A007 For electrical wiring work, please see instructions set out on the backside. For outdoor unit installation and refrigerant piping, please refer to the installation manual that comes with your outdoor unit.

  • Page 16: Selection Of Installation Location

    Rupture and injury caused by abnormal high pressure can result from such mixing.  Do not processing, splice the power cord, or share a socket with other power plugs.  The system should be applied to places as households, residences and the like. This may cause fire or electric shock due to defecting contact, defecting insulation and over-current etc.

  • Page 17: Connection Of Refrigerant Pipings

    RKY012A007 Fixing of indoor unit Since this air conditioner has been designed to collect dew drops on the rear Gutter surface to the drain pan, do not attach the power cord above the gutter. Indoor unit  How to remove the indoor unit from the installation board Installation Steps Wall Latch...
  • Page 18  To install, insert the panel arm into the slot on the Cover the body with the front panel. front panel from the position shown in right Fit the 4 latches in the upper section. illustration, hold the panel at both ends of lower Tighten the 5 set screws.

  • Page 19: Installation Of Outdoor Unit

    1.5.2 Installation of outdoor unit RWC012A030 Models SRC20ZIX-S, 25ZIX-S, 35ZIX-S Model 20•E 25•E 35 Designed for R410A refrigerant Check before installation work Model name and power source •œ Option parts Necessary tools for the installation work Q’ty Refrigerant piping length •œ...

  • Page 20: Refrigerant Piping Work

    When you have to unpack the unit for a compelling reason before you haul it to the Please observe all these instructions, because they include important points concerning safety. installation point, hoist the unit with nylon slings or ropes and protection pads so that The meanings of “Marks”...
  • Page 21 Notabilia as a unit designed for R410A Do not use any refrigerant other than R410A. R410A will rise to pressure about 1.6 times higher than that of a conventional refrigerant. A cylinder containing R410A has a pink indication mark on the top. gerant A unit designed for R410A has adopted a different size indoor unit operation valve charge port and a different size check joint provided in the unit to prevent the charging of a wrong refrigerant by mistake.
  • Page 22 perpendicular to the direction of the wind. Wind direction cle, which Wind direction an abrupt are fire. 2. REFRIGERANT PIPING WORK utlet and 1) Restrictions on unit installation and use stop pipe 　 Check the following points in light of the indoor unit specifications and the installation site. 　...

  • Page 23: Drain Piping Work

    Copper How to remove the side cover Please remove the screw of a side cover and remove to the front. Electrical installation work must be pipe outer diameter Do not use any supply cord ligh Carry out the on site piping work with the operation valve fully closed. 6.35 - braided cord (code designation Give sufficient protection to a pipe end (compressed and blazed, or with an adhesive tape) so...

  • Page 24: Electrical Wiring

    (1) Dress refrigerant pipes (both gas and liquid pipes) for heat insulation and prevention of dew condensation. - Improper heat insulation/anti-dew dressing can result in a water leak or dripping causing damage to household effects, etc. (2) Use a heat insulating material that can withstand 120 or a higher temperature.
  • Page 25 Power supply terminal block Power cable, indoor-outdoor connecting wires Cable clamp •œ Always perform grounding system installation work with the power cord unplugged. Earth leakage breaker It holds cables in place and protect the terminal •› (Harmonic resistant type) Always use an earth leakage circuit breaker designed for inverter circuits to CAUTION connection from external force.
  • Page 26 RWC012A029 Models SRC50ZIX-S, 60ZIX-S Model 40•E 50•E 60 Designed for R410A refrigerant Check before installation work Model name and power source •œ Option parts Necessary tools for the installation work Q’ty Refrigerant piping length •œ Piping,wiring and miscellaneous small parts •œ...
  • Page 27 you may not damage the unit. Never do it under any circumstances. Always do it according to the instruction. 2) Portage Q’ty Beware of danger from a dropped tool or the like in installing the unit in an elevated position. The right hand side of the unit as viewed from the front (diffuser side) is heavier.
  • Page 28 RWC012A029 Notabilia as a unit designed for R410A Model 40 50 60 Do not use any refrigerant other than R410A. R410A will rise to pressure about 1.6 times higher than that of a conventional refrigerant. A cylinder containing R410A has a pink indication mark on the top. Designed for R410A refrigerant A unit designed for R410A has adopted a different size indoor unit operation valve charge port and a different size check joint provided in the unit to prevent the charging of a wrong refrigerant by mistake.
  • Page 29 Improper installation can result in a compressor failure, broken piping within the unit and abnormal noise generation. 2.Install so the direction of the air from the blowing outlet will be perpendicular to the direction of the wind. Wind direction ycle, which Wind direction an abrupt bare fire.
  • Page 30 its form. Flare connection is used between the unit and refrigerant pipe. Flare a pipe after engaging a Copper pipe protrusion for flaring : B (mm) flare nut onto it. Flare dimensions for R410A are different from those for conventional R407C. Copper In the case of a rigid (clutch) type Screw...
  • Page 31 per meter of refrigerant piping (liquid pipe 6.35) for shipment at the factory (kg) covered without additional refrigerant charge Model 40, 50, 60 0.02 1.40 This unit contains factory charged refrigerant covering 15m of refrigerant piping and additional refrigerant charge on the installation site is not required for an installation with up to 15m refrigerant piping.
  • Page 32 4. ELECTRICAL WIRING WORK For details of electrical cabling, refer to the indoor unit installation manual. Electrical installation work must be performed by an electrical installation service provider qualified by a power provider of the country. Electrical installation work must be executed according to the technical standards and other regulations applicable to electrical installations in the country. Do not use any supply cord lighter than one specified in parentheses for each type below.
  • Page 33 Remote controller three cables contained in a conduit and a voltage drop is 2%. For an installation falling outside of these conditions, please follow the internal cabling regulations. Adapt it to the regulation in effect in each country. 5. UTILIZATION OF EXISTING PIPING. Check whether an existing pipe system is reusable or not by using the following flow chart.

  • Page 34: Outline Of Operation Control By Microcomputer

    1.6 Outline of operation control by microcomputer 1.6.1 Operation control function by remote controller S Operation section FAN SPEED button OPERATION MODE select button Each time the button is pressed, the Each time the button pressed, the display is switched over in turn. display is switched over in turn.

  • Page 35: Auto Restart Function

    1.6.2 Unit ON/OFF button When the remote controller batteries become weak, or if the remote controller is lost or malfunctioning, this button may be used to turn the unit on and off. (1) Operation Push the button once to place the unit in the automatic mode. Push it once more to turn the unit off. (2) Details of operation The unit will go into the automatic mode in which it automatically determines, from indoor temperature (as detected by sensor), whether to go into the cooling, thermal dry or heating modes.

  • Page 36: Flap And Louver Control

    1.6.5 Flap and louver control   Control the flap and louver by AIRFLOW (UP/DOWN) and (LEFT/RIGHT) button on the wireless remote controller.   (1) Flap   Each time when you press the AIRFLOW (UP/DOWN) button the mode changes as follows. (Flap stopped) (Swing) Angle of Flap from Horizontal...

  • Page 37: D Auto Operation

    1.6.6 3D auto operation Control the flap and louver by 3D AUTO button on the wireless remote controller. Air flow selection and air flow direction are automatically controlled, allowing the entire indoor to efficiently conditioned. (1) During Cooling and Heating (Including auto cooling and heating) (a) Air flow selection is determined according to indoor temperature and setting temperature.

  • Page 38: Timer Operation

    1.6.7 Timer operation (1) Comfortable timer setting (ON timer) If the timer is set at ON when the operation select switch is set at the cooling or heating, or the cooling or heating in auto mode operation is selected, the comfortable timer starts and determines the starting time of next operation based on the initial value of  minutes and the relationship between the indoor temperature at the setting time (temperature of room temperature sensor) and the setting temperature.

  • Page 39: Outline Of Heating Operation

    (a) Fuzzy operation Deviation between the indoor temperature setting correction temperature and the return air temperature is calculated in accordance with the fuzzy rule, and used for control of the air capacity and the compressor speed. Model SRK20ZIX-S SRK25ZIX-S SRK35ZIX-S SRK50ZIX-S...

  • Page 40: Outline Of Cooling Operation

    (2) Detail of control in each mode (Pattern) (a) Fuzzy operation During the fuzzy operation, the air flow and the compressor speed are controlled by calculating the difference between the indoor temperature setting correction temperature and the return air temperature. Model SRK20ZIX-S SRK25ZIX-S SRK35ZIX-S SRK50ZIX-S SRK60ZIX-S...

  • Page 41: Protective Control Function

    1.6.12 Protective control function (1) Frost prevention control (During cooling or dehumidifying) (a) Operating conditions Indoor heat exchanger temperature (Th) is lower than ºC. compressor command  minutes after reaching the compressor command speed except 0 rps. speed (b) Detail of anti-frost operation Lower limit Indoor heat exchanger...
  • Page 42 (4) Cooling low outdoor temperature protective control (a) Operating conditions: When the outdoor air temperature (TH) is ºC or lower continues for 0 seconds while the compressor command speed is other than 0 rps. (b) Detail of operation: The lower limit of the compressor command speed is set to  (0) rps and even if the speed becomes lower than  (0) rps, the speed is kept to 44 (30) rps.
  • Page 43 (6) Heating overload protective control (a) Operating conditions: When the outdoor air temperature (TH) is ºC (model 0, 0 : ºC) or higher continues for 0 seconds while the compressor command speed other than 0 rps. (b) Detail of operation: ) Taking the upper limit of compressor command speed range at 0 rps (model 0, 0 : 0 rps), if the output speed ob- tained with the fuzzy calculation exceeds the upper limit, the upper limit value is maintained.
  • Page 44 (8) Compressor overheat protection (a) Purpose: It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting from the compressor overheat. (b) Detail of operation 1) Speeds are controlled with temperature detected by the sensor mounted on the discharge pipe. (Example) Fuzzy  rps After lapse of  min.
  • Page 45 (13) Serial signal transmission error protection (a) Purpose: Prevents malfunction resulting from error on the indoor ↔ outdoor signals. (b) Detail of operation: If the compressor is operating and a serial signal cannot be received from the indoor control with outdoor control having serial signals continues for  minute and  seconds, the compressor is stopped.

  • Page 46: Floor Standing Type(Srf)

    2. FLOOR STANDING TYPE(SRF) CONTENTS 1 RANGE OF USAGE & LIMITATIONS ..........1 CONTENTS 2 INDOOR UNIT ..................3 Wall mounted type (SRK) ............3 2.1 Electrical wiring ..................46 Specifications ................3 2.2 Piping system .................... 48 Exterior dimensions ..............8 Electrical wiring .................

  • Page 48: Outdoor Unit

    (2) Outdoor unit Models SRC25ZIX-S, 35ZIX-S Refer to page 4. Model SRC50ZIX-S Refer to page 5.

  • Page 49: Piping System

    2.2 Piping system Models SRF25ZIX-S,35ZIX-S Model SRF25ZIX-S, 35ZIX-S Cooling cycle Heating cycle Indoor unit Outdoor unit Outdoor air Flare temp. sensor connection Service valve (TH2) (Gas) Discharge pipe temp. sensor Gas pipie Check joint Heat Muffler (TH3) (ø9.52) Room temp. exchanger sensor sensor...
  • Page 50 2.3 Noise level Model SRF25ZIX-S Condition ISO-T1,JIS C9612 (Indoor Unit) Model SRF25ZIX-S Cooling 38 dB(A) Noise Level Heating 38 dB(A) × ..Cooling, Heating N7 0 N6 0 N 5 0 N 4 0 N 3 0 N 2 0 1000 2000 4000...

  • Page 51: Noise Level

    Model SRF35ZIX-S Condition ISO-T1,JIS C9612 (Indoor Unit) Model SRF35ZIX-S Cooling 39 dB(A) Noise Level Heating 39 dB(A) × ..Cooling, Heating N7 0 N6 0 N 5 0 N 4 0 N 3 0 N 2 0 1000 2000 4000 8000 Mid Octave Band frequency (Hz) (Outdoor Unit)
  • Page 52 Model SRF50ZIX-S Condition ISO-T1,JIS C9612 (Indoor Unit) Model SRF50ZIX-S Cooling 50 dB(A) Noise Level Heating 50 dB(A) × ..Cooling, Heating N 7 0 N 6 0 N 5 0 N 4 0 N 3 0 N 2 0 1000 2000 4000 8000...

  • Page 53: Sensible Heat Capacity

    2.4 Sensible heat capacity Model SRF25ZIX-S Cool Mode Heat Mode Indoor air temp indoor air temp outdoor 21˚CDB 23˚CDB 26˚CDB 27˚CDB 28˚CDB 31˚CDB 33˚CDB Air flow Outdoor air temp. Air flow air temp. 14˚CWB 16˚CWB 18˚CWB 19˚CWB 20˚CWB 22˚CWB 24˚CWB 16˚CDB 18˚CDB 20˚CDB...

  • Page 54: Application Data

    2.5 Application data R410A REFRIGERANT USED INSTALLATION DIRECTIONS 　2.5.1 Installation of indoor unit FLOOR TYPE AIR CONDITIONER. This instruction manual illustrates the method of installing an indoor unit. RFB012A002 For electrical wiring work, please see instructions set out on the backside. For outdoor unit installation and refrigerant piping, please refer to the installation manual that comes with your outdoor unit.
  • Page 55  Do not processing, splice the power cord, or share a socket with other power plugs.  The equipment shall be installed in accordance with national wiring regulations. This may cause fire or electric shock due to defecting contact, defecting insulation and over-current etc. ...
  • Page 56 CAUTION Fixing of indoor unit During the installation, do not lean on the control box or the display, as they may be damaged. Floor installation Wall installation Secure using lower 2 screws for floor installations. At first secure the installation board using 5 screws and the indoor unit using 2 screws. If possible, also attach two upper screws.
  • Page 57 4 Pass the connecting wire through the wiring holder. Clamp Stranded core slightly until the latch works. 4or5 Number of conductors One conductor of the cable is the earth Fixing screw Wiring holder conductor (yellow/green) Section of copper wire (mm Sensor Concealed installation Installing the air-cleaning filters...

  • Page 58: Installation Of Outdoor Unit

    2.5.2 Installation of outdoor unit Models SRC25ZIX-S, 35ZIX-S Refer to page 18. Model SRC50ZIX-S Refer to page 25.

  • Page 59: Outline Of Operation Control By Microcomputer

    2.6 Outline of operation control by microcmputer 2.6.1 Operation control function by remote controller Operation section Model All models FAN SPEED button OPERATION MODE select button Each time the button is pressed, the Each time the button pressed, the display is switched over in turn. display is switched over in turn.
  • Page 60 2.6.2 Unit ON/OFF button When the remote controller batteries become weak, or if the remote controller is lost or malfunctioning, this button may be used to turn the unit on and off. (1) Operation Push the button once to place the unit in the automatic mode. Push it once more to turn the unit off. (2) Details of operation The unit will go into the automatic mode in which it automatically determines, from indoor temperature (as detected by sensor), whether to go into the cooling, thermal dry or heating modes.

  • Page 61: Flap Control

    2.6.5 Flap control   Control the flap by AIRFLOW (UP/DOWN) button on the wireless remote controller. (1) Flap   Each time when you press the AIRFLOW (UP/DOWN) button the mode changes as follows. (Flap stopped) (Swing) Angle of Flap from Horizontal Remote controller display COOL , DRY, FAN...
  • Page 62 (2) Auto air outlet selection 　(a) COOL, DRY operation 1) In case both lower and upper outlets operation is selected in Cooling or Dry operation, both outlets will be kept for sixty minutes after the start or until indoor temperature is below the setting point. And then the air outlet will change to the upper outlet.
  • Page 63 (3) Defrosting operation (a) Starting conditions (Defrosting operation can be started only when all of the following conditions are met.) 1) After start of heating operation When it elapsed 45 (model 50 : 35) minutes. (Accumulated compressor operation time) 2) After end of defrosting operation When it elapsed 45 (model 50 : 35) minutes.
  • Page 64 2.6.10 Outline of automatic operation (1) Determination of operation mode The unit checks the indoor temperature and the outdoor air temperature, determines the operation mode, and then begins in the automatic operation. Cooling 27.5 25.5 Dehumidifying Indoor air temperature (˚C) 19.5 Heating Outdoor air temperature (˚C)
  • Page 65 (2) Cooling overload protective control (a) Operating conditions: When the outdoor air temperature (TH2) has become continuously for 30 seconds at 41ºC or more, or 47ºC or more (Models 50, 60: 41ºC or more) with the compressor running, the lower limit speed of compressor is brought up.
  • Page 66 (c) Reset conditions: When either of the following condition is satisfied The outdoor air temperature (TH2) is D ˚C or higher. The compressor command speed is 0 rps. (5) Heating high pressure control (a) Purpose: Prevents anomalous high pressure operation during heating. (b) Detector: Indoor heat exchanger sensor (Th2) (c) Detail of operation: (Example) Fuzzy...
  • Page 67 (7) Heating low outdoor temperature protective control • Models : 20 , 35 (a)　Operating conditions:　 When the outdoor air temperature (TH2) is lower than - 10ºC or higher continues for 30 seconds while the compressor command speed is other than 0 rps. (b)　Detail of operation:　　...
  • Page 68 2) If the temperature of 110ºC (model 50 : 115ºC) is detected by the sensor on the discharge pipe, then the compressor will stop immediately. When the discharge pipe temperature drops and the time delay of 3 minutes is over, the unit starts again within 1 hour but there is no start at the third time.
  • Page 69 (16) Outdoor fan control at low outdoor temperature Cooling ◆ (a) Operating conditions: When the outdoor air temperature (TH2) is 22ºC or lower continues for 30 seconds while the compressor command speed is other than 0 rps. (b) Detail of operation: After the outdoor fan operates at A speed for 60 seconds; the corresponding outdoor heat exchanger temperature shall implement the following controls.

  • Page 70: Maintenance Data

    3 MAINTENANCE DATA 3.1 Troubleshooting procedures for electrical equipment (1) Cautions (a) If you are disassembling and checking an air conditioner, be sure to turn off the power before beginning. When working on indoor units, let the unit sit for about 1 minute after turning off the power before you begin work. When working on an outdoor unit, there may be an electrical charge applied to the main circuit (electrolytic condenser), so begin work only after discharging this electrical charge (to DC 10 V or lower).
  • Page 71 (4) Troubleshooting procedure (If the air conditioner runs) Confirm the contents of the customer complaint. The cause of the trouble can be specifically identified. Check the self-diagnosis display. Eliminate the cause of the trouble and perform an operation check. See page 71. Using the Service mode, access the self-diagnosis Is an error code displayed by displays generated in the past.

  • Page 72: Outdoor Unit

    (5) Self-diagnosis table When this air conditioner performs an emergency stop, the reason why the emergency stop occurred is displayed by the flashing of display lights. If the air conditioner is operated using the remote controller 3 minutes or more after the emergency stop, the trouble display stops and the air conditioner resumes operation. Wired Indoor unit display panel Outdoor remote Description...

  • Page 73: Service Mode

    (6) Service mode (Trouble mode access function) This air conditioner is capable of recording error displays and protective stops (service data) which have occurred in the past. If self-diagnosis displays cannot be confirmed, it is possible to get a grasp of the conditions at the time trouble occurred by checking these service data.
  • Page 74 *3: To count the number of flashes in the service mode, count the number of flashes after the light lights up for 1.5 second initially (start signal). (The time that the light lights up for 1.5 second (start signal) is not counted in the number of flashes.) 1.5 sec.

  • Page 75: Remote Controller Setting

    (Example) Remote controller setting Operation Displayed data Fan speed Temperature switching switching setting Cooling Displays the reason for the stop (error code) the previous time an error was displayed. 21ºC 22ºC Displays the reason for the stop (error code) 2 times previous when an error was displayed. 23ºC Displays the reason for the stop (error code) 3 times previous when an error was displayed.
  • Page 76 (c) Error code, stop code table (Assignment of error codes and stop codes is done in common for all models.) Number of flashes when in service mode Stop coad Error Auto TIMER Error content Cause Occurrence conditions display recovery light light Error coad (10's digit) (1's digit) Normal 5 time...
  • Page 77 Note (1) The number of flashes when in the Service Mode do not include the 1.5 second period when the lights light up at first (starting signal). (See the example shown below.) 1.5 sec. RUN light (10’s digit) 0.5 sec. 0.5 sec.
  • Page 78 (e) Room temperature sensor, indoor heat exchanger sensor, outdoor air temperature sensor, outdoor heat exchanger sensor table Units: °C TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (sounds for 0.1 second) (does not sound) * If no data are recorded (error code is normal), the display for each sensor becomes as shown below. Sensor value displayed when the error code is normal Sensor name -64ºC...
  • Page 79 (f) Discharge pipe sensor table Units: °C TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (sounds for 0.1 second) (does not sound) * If no data are recorded (error code is normal), the display for each sensor becomes as shown below. Sensor value displayed when the error code is normal Sensor name -64ºC...
  • Page 80 Service data record form Customer Model Date of investigation Machine name Content of complaint Display results Remote controller settings Display content Content of displayed data Temperature setting Operation switching Fan speed switching Buzzer (Yes/No.) RUN light (Times) TIMER light (Times) Error code on previous occasion. Cooling Room temperature sensor on previous occasion.
  • Page 81 (7) Inspection procedures corresponding to detail of trouble Sensor error Broken sensor wire, connector poor connection Is connector connection good? Correct connection. Is sensor resistance value good? Replace sensor. Replace PCB. ◆ Sensor temperature characteristics (Room ◆ Discharge pipe sensor temperature characteristics temp., indoor heat exchanger temp., out- door heat exchanger temp., outdoor air temp.) (Broken wire) (Broken wire) (Short circuit) (Short circuit) - 10 Temperature (˚C)
  • Page 82 Current cut Compressor lock, Compressor wiring short circuit, Compressor output is open phase, Outdoor PCB is faulty, Service valve is closed, EEV is faulty, Compressor faulty. In the service valves of the outdoor Open the service valves unit open? Secure space for suction Is there any shortcircuit? and blow out. Does electronic expansion valve Defective EEV For inspection of electronic expansion valve, see page 89 operate normally? Defective outdoor PCB When the inverter is operated...
  • Page 83 Over heat of compressor Gas shortage, defective discharge pipe sensor Connector connection check, resistance Is discharge pipe sensor value check, replacement of discharge pipe resistance value good? sensor (page 80) Check if there are any Does trouble persist after Is sufficient quantity of refrigerant places where gas is leaking. charging gas? circulated? Clogged capillary tube or...
  • Page 84 Trouble of outdoor unit Insufficient refregerant amount, Faulty power transistor, Broken compressor wire Service valve close, Defective EEV, Defective outdoor PCB Check power supply. Is the power supply voltage OK? Proper power supply voltages are as follows. (At the power supply outlet) 220V : 198~242V 230V : 207~253V 240V : 216~264V Is the service valves of the outdoor Open the service valves.
  • Page 85 Outdoor fan motor error Defective fan motor, connector poor connection, defective outdoor PCB Is connector connection good? Correct connector connection Is fan motor resistance value good? * Disconnect the fan motor connector, then investigate the fan motor and outdoor PCB separately. Replace outdoor fan motor Is the output of the outdoor PCB normal? Defective outdoor PCB Normal...
  • Page 86 (b) Outdoor unit Phenomenon Operation Sensor mode Shortcircuit Disconnected wire Cooling System can be operated normally. Compressor stop. Heat exchanger sensor Defrosting is not performed. Defrosting is performed for 10 minutes at approx. 35 minutes. Heating System can be operated normally. Compressor stop. Cooling Ourdoor air temperature sensor...
  • Page 87 (C) Power transistor inspection procedure [Use a tester with a needle indicator for the inspection. (Do not use a digital tester. Check in the AC 300 volt range.)] (1) If there is a self-diagnosis display, inspect the compressor system (burns, wiring mistakes, etc.) If no problems are found, check the output of the power transistor.
  • Page 88 (10) Outdoor unit inspection points Models SRC20ZIX-S,25ZIX-S,35ZIX-S...
  • Page 89 Models SRC50ZIX-S,60ZIX-S...
  • Page 90 (a) Inspection of electronic expansion valve Electronic expansion valve operates for approx. 10 seconds after the power on, in order to determine its aperture. Check the operating sound and voltage during the period of time. (Voltage cannot be checked during operation in which only the aperture change occurs.) 　...

  • Page 91: Servicing

    3.2 Servicing (1) Evacuation The evacuation is an procedure to purge impurities..noncondensable gas, air, moisture from the refrigerant equipment by us- ing a vacuum pump. Since the refrigerant R410A is very insoluble in water, even a small amount of moisture left in the refriger- ant equipment will freeze, causing what is called water clogging.

  • Page 92: Refrigerant Piping Installation/Servicing Manual For Air Conditioners Using R410A

    4 REFRIGERANT PIPING INSTALLATION/SERVICING MANUAL FOR AIR CONDITIONERS USING R410A (These materials are extracted from document issued by The Japan Refrigeration and Air Conditioning Industry Association) 4.1 Outline 4.1.1 Refrigerant R410A (1) Adoption of R410A in air conditioners In 1974, it was pointed out that the ozone layer in the upper stratosphere (about 20 ~ 40 km above ground) might have been damaged by the ozone depleting substances such as CFC (chlorofluorocarbon) and HCFC (hydrochlorofluorocarbon). Since that time, many countries across the world have endeavored to take countermeasures against the ozone depletion.

  • Page 93: Refrigerant Piping Installation

    (3) Lubricating oils for R410A As the lubricating oils for R22, mineral oils, alkylbenze synthetic oils, etc. have so far been used. As R410A features less solubility with these conventional lubricating oils such as mineral oils, the lubricating oils tend to stay within the refrigeration cycle. As the lubricating oils highly soluble with R410A, ester, ethereal and other synthetic oils are available.
  • Page 94 (2) Joints For copper pipes, flare joints or socket joints are used. Prior to use, be sure to remove all contaminants. a) Flare joints Flare joints used to connect the copper pipes cannot be used for pipings whose outer diameter exceeds 20 mm. In such a case, socket joints can be used.
  • Page 95 d) Flare processing øD Make certain that a clamp bar and copper pipe have been cleaned. By means of the clamp bar, perform the flare processing correctly. Use either a flare tool for R410A or conventional flare tool. Flare processing dimensions differ according to the type of flare tool. Be careful. When using a conventional flare tool, be sure to secure “dimension A”...
  • Page 96 Table 8. Flare and flare nut dimensions for R22 [unit: mm] Dimension (mm) Nominal Outer diameter Thickness Flare nut width diameter (mm) (mm) 6.35 9.52 13.0 13.5 12.7 16.2 16.0 12.9 (2) Flare connecting procedures and precautions a) Make sure that the flare and union portions do not have any scar or dust, etc. b) Correctly align the processed flare surface with the union axis.
  • Page 97 (2) Identification a) Piping set A copper pipe as piping set for R410A must have a thickness as stated in Table 3 (see page 92), and, as shown in Tables 5 and 6 (see page 94), it also differs from R22 in flare processing and flare nut dimensions. So, it is necessary to choose a pip- ing set suitable for R410A.
  • Page 98 (3) Flux a) Reasons for the use of flux • By removing the oxide film and any foreign matter on the metal surface, it assists the flow of brazing filler. • In the brazing process, it prevents the metal surface from being oxidized. •...

  • Page 99: Installation, Removal And Servicing

    Reducing valve Flow meter Stop valve From the nitrogen cylinder Piping Nitrogen gas Rubber plug for sealing Fig.5 Prevention of oxidation during brazing * Cautions during brazing ① General cautions 1) The brazing strength should be high as required. 2) After operation, airtightness should be kept under a pressurized condition. 3) During brazing do not allow component materials to become damaged due to overheating.
  • Page 100 (1) Tools exclusive for R410A a) Gauge manifold • As R410A is characterized by high pressure, conventional tools cannot be used. Table 11. Differences between conventional high/low pressure gauges and those for R410A Conventional gauges Gauges exclusive for R410A High pressure -0.1~3.5MPa -0.1~5.3MPa gauge (red)
  • Page 101 e) Flare tool (clutch type) • A flare tool for R410A is provided with a large clamp bar receiving hole so that the projection of the copper pipe from the clamp bar can be set at 0~0.5 mm in flare processing, and also features higher spring strength for increased expansion pipe torque.
  • Page 102 4.3.2 New installation work (when using new refrigerant piping) (1) Air purge by vacuum pump and gas leakage inspection (see Fig. 6) a) Connect the charge hose to the outdoor unit. ① b) Connect the charge hose to the vacuum pump adapter. ② At this time, keep the service valves in the fully closed position. ③ ④ c) Place the handle Lo in the fully opened position ⑤...
  • Page 103 f) After charging liquid refrigerant into the air conditioner by closing the charging valve, stop operation by fully closing the gauge manifold’s valve Lo. ② ⑤ g) Quickly remove the charge hose from the service port. ⑥ When stopped halfway, refrigerant being cycled will be released. h) After securing the caps on the service port and service valve, check the caps’...

  • Page 104: Refrigerant Recovery

    4.3.6 Refrigerant recharging at servicing When it becomes necessary to recharge refrigerant, charge the specified amount of new refrigerant according to the following steps. (For details, see the instruction manual prepared by the equipment manufacturer) 1) Connect the charge hose to the outdoor unit’s service port. 2) Connect the charge hose to the vacuum pump adapter.
  • Page 105 (4) Recovering procedures a) According to the instructions for handling the refrigerant recovering equipment (described in the attached instruction manual), operate the equipment to recover refrigerant. b) During the operation, take care of the following cautions. ① Ascertain that the refrigerant recovering equipment is running as required and always monitor the state of operation so that adequate steps can be taken in an emergency.
  • Page 106 b) Charge hose (pressure resistant hose for fluorocarbon) and packing • It is 1/4B in thickness and available in various lengths, etc. • Use a hose whose pressure resisting performance is higher than 5.2 MPa (52 kg/cm • Generally, a setting fixture is provided only on one end. (4) Gauge manifold Hose •...
  • Page 107 INVERTER WALL MOUNTED TYPE AND FLOOR STANDING TYPE ROOM AIR-CONDITIONER Air-Conditioning & Refrigeration Systems Headquarters 16-5, 2-chome, Kounan, Minato-ku, Tokyo, 108-8215, Japan Fax : (03) 6716-5926 Because of our policy of continuous improvement. we reserve the right to make changes in all specifications without notice. updated 24,April,2009...

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