Hitachi SET FREE FSN2 Series Service Manual
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Hitachi SET FREE FSN2 Series Service Manual

Hitachi SET FREE FSN2 Series Service Manual

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Outdoor Units: RAS-(8~48)FSN2

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  • Page 1 SET FREE SERIES FSN2 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html Service manual Outdoor Units: RAS-(8~48)FSN2...
  • Page 2 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
  • Page 3 Contents Service Manual Contents Model codes and descriptions Units installation Piping installation Electrical wiring Control system Available optional functions Test run Troubleshooting Spare parts Servicing Main parts Field work instruction SMGB0049 rev.0 - 02/2009 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

  • Page 4: Table Of Contents

    Contents Service Manual Model codes and descriptions ____________________________________________ v Units installation _______________________________________________________1 General installation notes _______________________________________________________________ 2 Transportation and handling _____________________________________________________________ 4 1.2.1 Hanging method _________________________________________________________________________ 4 1.2.1 Center of gravity _________________________________________________________________________ 7 1.3. Outdoor units installation _______________________________________________________________ 8 1.3.1 Before installation ________________________________________________________________________ 8 1.3.2 Installation location _______________________________________________________________________ 9...
  • Page 5 Contents Service Manual Available optional functions _____________________________________________67 5.1. Outdoor units _______________________________________________________________________ 68 5.1.1. Setting of external input and output functions __________________________________________________ 68 5.1.2. Description of external input signals _________________________________________________________ 70 5.1.3. Description of external output signals ________________________________________________________ 73 5.1.4. Optional functions _______________________________________________________________________ 75 Test run ____________________________________________________________83 6.1.
  • Page 6 Contents Service Manual Main parts _________________________________________________________251 10.1. Inverter ___________________________________________________________________________ 252 10.1.1. Specifications of inverter _________________________________________________________________ 252 10.1.2. Inverter time chart ______________________________________________________________________ 254 10.1.3. Protective Function _____________________________________________________________________ 255 10.1.4. Overload Control _______________________________________________________________________ 256 10.2. Thermistor ________________________________________________________________________ 257 10.2.1. Position of thermistor ____________________________________________________________________ 257 10.2.2.

  • Page 7: Model Codes And Descriptions

    Model codes Service Manual Model codes and descriptions Unit code list ¡ Please check by model name your air conditioner type, its abbreviation and reference number MODEL CODIFICATION in this service manual. FSN(2)(E) INDOOR UNITS 4-Way Cassette 4-Way Mini Cassette 2-Way Cassette Ceiling Unit...
  • Page 8 Model codes Service Manual FSN(2)(E) INDOOR UNITS Floor Concealed Duct Wall Floor Enclosure Enclosure Unit Code Unit Code Unit Code Unit Code Unit Code RPK-1.0FSNH2M 60277942 RPI-0.8FSN2E 7E420000 RPIM-0.8FSN2E 7E430000 RPK-1.5FSNH2M 60277942 RPI-1.0FSN2E 7E420001 RPIM-1.0FSN2E 7E430001 RPK-1.0FSN2M 60277941 RPF-1.0FSN2E 7E450001 RPFI-1.0FSN2E 7E460001 RPI-1.5FSN2E...
  • Page 9 Model codes Service Manual FSN2 OUTDOOR UNITS Unit Code Unit Code Unit Code Unit Code RAS-8FSN2 60288134 RAS-10FSN2 60288135 RAS-12FSN2 60288136 RAS-14FSN2 60288137 RAS-16FSN2 60288138 RAS-18FSN2 60288139 RAS-20FSN2 60288140 RAS-22FSN2 60288141 RAS-24FSN2 60288142 RAS-26FSN2 60288143 RAS-28FSN2 60288144 RAS-30FSN2 60288145 RAS-32FSN2 60288146 RAS-34FSN2 60288147...
  • Page 10 Model codes Service Manual Complementary systems ¡ Name Description Code Figure KPI-502E1E 70600001 KPI-802E1E 70600002 KPI-1002E1E 70600003 Energy recovery ventilation units KPI-1502E1E 70600004 KPI-2002E1E 70600005 KPI-3002H1E 70600107 EF-5NE Econofresh kit 7E774148 List of accessories ¡ Name Description Code Figure PC-ART Remote control switch with timer 70510000 PSC-A64S...
  • Page 11 Model codes Service Manual Name Description Code Figure PC-LH3A Wireless remote control switch 60291056 PC-ARH Optional remote controller 60291486 Receiver kit PC-ALH 60291464 (for RCI-FSN2E -on the panel-) Receiver kit PC-ALHD 60291467 (for RCD-FSN2· -on the panel-) Receiver kit PC-ALHZ (for RCI, RCD, RPC, RPI, RPK, RPF(I) - 60291473 (FSN2(E)) -on the wall-)
  • Page 12 Model codes Service Manual Name Description Code Figure Buildin g Management System Gateway to LONWORKS systems. 60290874 (max. 64 IU, 8 parameters) HARC-BXE (A) Building Management System HARC-BXE (B) Gateway to LONWORKS systems. 60290875 (max. 32 IU, 16 parameters) Building Management System HC-A64BNP 60291569 Gateway to BAC Net system.
  • Page 13 Model codes Service Manual Name Description Code Figure B-23H4 Adapter for deodorant filter 60199790 F-23L4-K Antibacteria filter 60199791 F-23L4-D Deodorant filter 60199793 F-46L4-D Deodorant filter 60199794 PDF-23C3 Duct connection flange 60199795 PDF-46C3 Duct connection flange 60199796 OACI-232 Fresh-air intake kit 60199797 PD-75 Fresh-air intake kit...
  • Page 14 Model codes Service Manual Name Description Code Figure HR-500 70550101 HR-800 70550102 Energy exchanger for KPI HR-1000 70550103 (heat recovery) HR-1500 70550104 HR-2000 70550105 STL-30-200-L600 70550200 STL-30-250-L600 70550201 Sound attenuator STL-30-300-L600 70550202 (Heat/energy recovery) STL-30-355-L600 70550203 STL-30-450-L600 70550204 SMGB0049 rev.0 - 02/2009 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

  • Page 15: Units Installation

    Units installation Service Manual Units installation This chapter provides information about the procedures you must follow to install the Set-Free FSN2 outdoor units. Contents Units installation ____________________________________________________________ 1 General installation notes ____________________________________________________ 2 Transportation and handling __________________________________________________ 4 1.2.1 Hanging method ________________________________________________________________ 4 1.2.1 Center of gravity ________________________________________________________________ 7 1.3.

  • Page 16: General Installation Notes

    Units installation Service Manual 1.1 General installation notes  warning Install the outdoor unit with sufficient clearance around it for operation and maintenance as shown in the next pages. Install the outdoor unit where good ventilation is available. Do not install the outdoor unit where exists a high level of oil mist, salty air or sulphurous atmosphere. Install the outdoor unit as far as practical (being at least 3 meters) from electromagnetic wave radiator, such as medical equipment.
  • Page 17  Note Hitachi indoor units are designed for free air discharge (Static Pressure, Pst=0), except ducted indoor units as RPIM, which require to be connected to discharge air ducts. For these units see flow-static pressure chart. SMGB0049 rev.0 - 02/2009...

  • Page 18: Transportation And Handling

    Units installation Service Manual 1.2 Transportation and handling Transport the product as close to installation location as practical before unpacking.  caution - Do not put any material on the product. 1.2.1 Hanging method When hanging the unit, ensure a balance of the unit, check safety and lift up smoothly. ...
  • Page 19 Units installation Service Manual  For installation RAS-(8~12)FSN2 - Remove the wooden base. - Apply two (2) ropes on the splints or corrugated paper to protect the unit, and hang the unit as shown below Do not remove paper frame and plastic band Angle of wire more than 60 º...
  • Page 20 Units installation Service Manual  For installation RAS-(26~42)FSN2 - Hang the unit without removing the packaging with four (4) ropes. Push through the wire ropes into the hang hole and clamp the wires by using shackle as shown below. Wire rope Angle of wire more than 60°...

  • Page 21: Center Of Gravity

    Units installation Service Manual 1.2.1 Center of gravity  When using handles When manually lifting the unit using the handles, pay attention to the following: do not remove the wooden base from outdoor unit to prevent it from overturning, paying attention to the center of gravity as shown in the below figure. Two persons are needed to move this unit.

  • Page 22: Outdoor Units Installation

    Units installation Service Manual 1.3. Outdoor units installation  WARNING – Install the outdoor unit with sufficient clearance around it for operation and maintenance as shown in the next figures. – Install the outdoor unit where good ventilation is available –...

  • Page 23: Installation Location

    Units installation Service Manual 1.3.2 Installation location not be exposed to direct sunshine or direct radiation from high temperature heat source . Installation place – Do not install the outdoor unit where dust or other – Install the outdoor unit with a sufficient space around contamination could block the outdoor heat exchanger .

  • Page 24: Serial Units Installation

    Units installation Service Manual 1.3.3 Serial units installation In case that the front and either of the sides are open. No limit to wall height No limit to wall height Provide a distance of 1000 mm to the next unit In case that there is a sourounding wall.

  • Page 25: Multiple Installation Space

    Units installation Service Manual 1.3.4 Multiple installation space Keep the upper side open to prevent air short-circuiting. – In case that the front and either of the sides are open. - Installation in the same direction No limit to wall height (Max.
  • Page 26 Units installation Service Manual – Rear to rear installation (case 1) No limit to wall height (*1): h1 = Rear side wall height - 500 mm (*2): h2 = Front side wall height - 500 mm * A space of 900 mm is recommended for easier service work –...
  • Page 27 Units installation Service Manual Min. 300 Fence Min. 300  Note: – In case that the rear space is less than 1600 mm and the side space is less than 400 mm, apply a field-supplied fence for each unit. Other models: Model Number of cabinets ...
  • Page 28 Units installation Service Manual Consideration to Seasonal Wind Avoid the installation that the air intake side (Rear) of the unit is faced directly against a seasonal strong wind. Seasonal Wind Correct Seasonal Wind Correct Windbreak Fence Air Intake Side (Rear) Air Intake Side (Rear) Incorrect...

  • Page 29: Foundations

    Units installation Service Manual 1.3.5. Foundations Concrete foundations 1 The height of the foundation should be 100 to 300mm Outdoor unit higher than the ground level. Anchor bolt (M12) 2 Install a drainage around foundation for smooth drain. (Field supplied) Nut (Field supplied) Washer (Field supplied) Vibration proof mat...
  • Page 30 Units installation Service Manual Drain water treatement Position of anchor bolts While heating or defrosting operation, drain water is When installing the outdoor unit, fix the unit by anchor discharged. Provide adequate drainage around the bolts. Refer to figure below regarding the location of fixing foundation.

  • Page 31: Piping Installation

    Piping installation Service Manual Piping installation Contents Piping installation __________________________________________________________ 17 2.1. Piping work considerations _________________________________________________ 18 2.1.1 Copper pipes and sizes _________________________________________________________ 18 2.1.2 Three principles on refrigerant piping work __________________________________________ 21 2.1.3 Suspension of refrigerant piping ___________________________________________________ 21 2.1.4.

  • Page 32: Piping Work Considerations

    Piping installation Service Manual 2.1. Piping work considerations 2.1.1 Copper pipes and sizes 1. Prepare locally-supplied copper pipes. 2. Select the piping size with the correct thickness and correct material which can have sufficient pressure strength. Use the table below to select the required pipe. Nominal Diameter Thickness Copper type...

  • Page 33: Piping Connection

    Piping installation Service Manual Piping Connection When connecting liquid piping for units with piping longer than 15 meters, apply a piping size of Ø9.53 mm (3/8 inches). Fix the connecting pipe as shown in the following figure using the insulation attached to the Indoor Unit. Fix this part with the attached cord Insulate this part with the...
  • Page 34 Piping installation Service Manual • Insulation Attach the pipe insulation to each branch using vinyl tape. Attach also insulation to field supplied pipes in order to prevent the capacity decrease according to the ambient air conditions and dewing on the low pressure pipe surface. Field supplied insulation Do not make a gap ...

  • Page 35: Three Principles On Refrigerant Piping Work

    Piping installation Service Manual 2.1.2 Three principles on refrigerant piping work In case of using refrigerant R410A in the refrigeration cycle, the refrigeration oil should be of a synthetic type one. In order to avoid oxidation, pay much careful attention to basic piping work control to avoid infiltration of moisture or dust during the refrigerant piping work.

  • Page 36: Tightening Torque

    Piping installation Service Manual 2.1.4. Tightening torque 1. Flaring connections (smaller than a diameter of Ø19.05) are generally used. However, if incorrect flaring is performed, it will cause serious refrigerant leakage. 2. Shape after Flaring, it should be rectangular and flat, and no uneven thickness, cracks and scratches should exist. Nominal diameter Ød Dimension (inches)

  • Page 37: Brazing Work

    Piping installation Service Manual 2.1.5. Brazing work The most important work in the refrigerant piping installation work is the brazing of the pipes. If it accidentally occurs a leakage due to a careless brazing process, it will cause clogged capillary pipes or serious compressor failure. In order to guarantee a proper brazing neck between different pipes surfaces, accurate pipe dimensions after the expansion process (see the table below): It is important to control the clearance of the pipe fitting portion as shown below.

  • Page 38: Outdoor Units Piping Installation

    Piping installation Service Manual 2.2. Outdoor units piping installation 2.2.1. Factory supplied accessories Accessory Q’ty Purpose Flange gasket Connection for refrigerant gas piping with RAS-10FSN2 to Pipe flange of refrigerant gas 48FSN2 piping Pipe with flare nut of refrigerant gas piping Connection for refrigerant gas piping with RAS-8FSN2 (Ø19.05) Pipe with flare nut of...

  • Page 39: Position Of Piping Connections

    Piping installation Service Manual 2.2.2. Position of piping connections – Remove the service cover as shown in fig. below before piping connection. – Remove fixing screws on the lower position (6 pieces) and the upper position (8 pieces). – Connect the pipes with the liquid line stop valve and the gas line stop valve of the outdoor units as shown: Model ...

  • Page 40: Flange Piping Connection

    Piping installation Service Manual 2.2.3. Flange piping connection Figure 1 Figure 2 Figure 3 Figure 4 Dimensions (mm) Model Figure ØD (ID) ØE (ID) RAS-10FSN2 Gas 22.2 – RAS-12FSN2 Gas 25.4 – RAS-14FSN2 Gas 25.4 – RAS-16~24FSN2 Gas 28.6 – RAS-26~34FSN2 Gas 31.75 34.92...

  • Page 41: Piping Connection

    Piping installation Service Manual 2.2.4. Piping connection – Confirm that the valve is closed. – Prepare a field-supplied bend pipe for liquid line. Connect it to the liquid valve by flare nut through the square hole of bottom base. – For gas piping connection:: RAS-10~48HP –...

  • Page 42: Vacuum And Refrigerant Charge

    Piping installation Service Manual 2.2.5 Vacuum and refrigerant charge 1. The stop valve has been closed before shipment, however, make sure that the stop valves are closed completely. 2. Connect the indoor unit and the outdoor unit with field-supplied refrigerant piping. Suspend the refrigerant piping at specified points and prevent the refrigerant piping from touching weak parts of the building such as wall, ceiling, etc.
  • Page 43 Piping installation Service Manual 6. To charge refrigerant, connect the gauge manifold using charging hoses with a refrigerant charging cylinder to the check joint of the liquid line stop valve. 7 Fully open the gas line stop valve and slightly open the liquid line stop valve. 8 Charge refrigerant by opening the gauge manifold valve.

  • Page 44: Drain Discharging Boss

    Piping installation Service Manual 2.2.6. Drain discharging boss When the base of the outdoor unit is temporarily utilized as a drain receiver and the drain water in it is discharged, this drain boss is utilized to connect the drain piping. Model Applicable model Outdoor unit HP...

  • Page 45: Electrical Wiring

    Electrical wiring Service Manual Electrical wiring Contents Electrical wiring ____________________________________________________________ 31 3.1. General check ___________________________________________________________ 32 3.2. Electrical wiring for the outdoor unit ___________________________________________ 33 3.2.1. Electrical wiring connection for outdoor unit __________________________________________ 33 3.2.2 Setting the DIP switches for the outdoor unit _________________________________________ 34 3.3.

  • Page 46: General Check

    Electrical wiring Service Manual 3.1. General check danger - Before installing the electrical wiring or before performing a periodical check, turn OFF the main switch to the indoor unit and the outdoor unit. For safety reasons, be sure that the indoor fan and the outdoor fan have stopped.

  • Page 47: Electrical Wiring For The Outdoor Unit

    Electrical wiring Service Manual 3.2. Electrical wiring for the outdoor unit 3.2.1. Electrical wiring connection for outdoor unit FSN2 The electrical wiring connection for the outdoor unit is shown beside. 1. Connect the power supply wires to L1, L2, L3 and N (for 400V\50Hz) for the three-phase power source on the terminal board.

  • Page 48: Setting The Dip Switches For The Outdoor Unit

    Electrical wiring Service Manual 3.2.2. Setting the DIP switches for the outdoor unit Quantity and location of DIP switches Push switch PSW1: manual defrost Push switches PSW2, PSW3: Ckecking by 7-segment  NOTE The mark “■” indicates position of dips switches. Figures show setting before shipment or after selection. Not mark “■”...
  • Page 49 Electrical wiring Service Manual DSW2: Capacity setting No setting is required. Before shipment, each outdoor unit is se as shown below. Model RAS- 8FSN2 10FSN2 12FSN2 14FSN2 16FSN2 18FSN2 20FSN2 Setting position Model RAS- 22FSN2 24FSN2 26FSN2 28FSN2 30FSN2 32FSN2 34FSN2 Setting position Model RAS-...
  • Page 50 Electrical wiring Service Manual DSW5: Optional function setting Setting is required for the following optional functions. Setting before the shipment Except compressor Nº1 Except compressor Nº2 Except compressor Nº3 Except compressor Nº4 Except compressor Nº5 Judgement for refrigerant charge measurement Selection of the input signal Function setting DSW6: Piping lenght setting...
  • Page 51 Electrical wiring Service Manual DSW8: Unit model code setting No setting is required. All areas DSW9: Not prepared No setting is required. Setting before shipment DSW10: Setting for transmitting The setting for transmitting is required for the cancellation of end terminal resistance. Before the shipment, the No.1 pin of DSW10 is set at the ON side.

  • Page 52: Common Wiring

    Electrical wiring Service Manual 3.3. Common wiring 3.3.1. Electrical wiring between the indoor unit and the outdoor unit & CAUTION Use the shielded twisted pair cable or the shielded pair cable for the transmission cables between the indoor unit and the outdoor unit. Connect the shielded part to the earth screw in the electrical box of the indoor unit as shown below.

  • Page 53: Electrical Wiring Connection

    Electrical wiring Service Manual Electrical wiring connection Models: RAS-8~-48FSN2 Max. 4 Units / Power Supply Line (8 to 12HP) 1 Outdoor Unit / Power Supply Line (14 to 48HP) No.2 system No.1 system No.0 system outdoor unit outdoor unit outdoor unit Operating line (shielded twisted pair cable) DC5V (non-pole transmission, H-LINK II system)

  • Page 54: Wire Size

    3. The wire sizes marked with  in the table of this page are selected at the maximum current of the unit according to the wire, MLFC (Flame Retardant Polyflex Wire) manufactured by Hitachi Cable Ltd., Japan. 4. Use a shielded cable for the transmitting circuit and connect it to ground.
  • Page 55 Electrical wiring Service Manual Select the Main Switches in accordance with the following table: – Indoor units Model Power Source Maximum Running CB(A) ELB no. poles/A/mA Current (A) All indoor units 5.0 A 1~230V/50Hz 2/40/30 RPI-(8.0/10.0)FSN2E 10.0 A – Outdoor units Model Power Source Maximum Running...

  • Page 56: Electrical Wiring Diagrams

    Electrical wiring Service Manual 3.5. Electrical wiring diagrams This sub-chapter shows the Electrical Wiring Diagram for each unit of the new Hitachi Set Free FSN2. Unit model _______________________________________________________________________ Page Electrical wiring diagram for models: RAS-8~12FSN2 ________________________________________ 43 Electrical wiring diagram for models: RAS-14~24FSN2 _______________________________________ 44...
  • Page 57 Electrical wiring Service Manual SMGB0049 rev.0 - 02/2009 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
  • Page 58 Electrical wiring Service Manual SMGB0049 rev.0 - 02/2009 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
  • Page 59 Electrical wiring Service Manual SMGB0049 rev.0 - 02/2009 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...
  • Page 60 Electrical wiring Service Manual SMGB0049 rev.0 - 02/2009 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

  • Page 61: Control System

    Control system Service Manual Control system This chapter presents the control system flowcharts for the Set-FREE FSN2 Outdoor Units series. Contents Control system ____________________________________________________________ 47 4.1. Device control system _____________________________________________________ 48 4.1.1. RAS-8~48FSN2 refrigerant cycle control ____________________________________________ 48 4.2. Outdoor Units PCB ________________________________________________________ 51 4.2.1.

  • Page 62: Device Control System

    Control system Service Manual 4.1. Device control system 4.1.1. RAS-8~48FSN2 refrigerant cycle control Control subject Cooling process Heating process Defrost operation Purpose Contents Purpose Contents Contents Inverter frequency of 1. Total operation 1. 8Hz/I.U. HP 1. Total operation 1. 8Hz/I.U. HP All compressors are the compressor capacity of the...
  • Page 63 Control system Service Manual Control subject Cooling process Heating process Defrost operation Purpose Contents Purpose Contents Contents Solenoid valve 1. For equalizing In case of stopping For controlling In case of stopping – equalized pressure the pressure inverter comp. after inner pressure of inverter comp.
  • Page 64 Control system Service Manual The figure below shows the outline of the control system Example: RAS-48FSN2 + Indoor unit Suction gas pressure sensor (Ps) Multiple signals Discharge gas pressure sensor (Pd) Single signals Wireless remote control switch Thermistor for inlet air Thermistor for ambient temperature (THM7) Thermistor of discharge air Discharge gas thermistor (THM8, 9, 12, 13, 18)

  • Page 65: Outdoor Units Pcb

    Control system Service Manual 4.2. Outdoor Units PCB 4.2.1. RAS-8~48FSN2 PCB drawing LED INDICATION Power Source for PCB1 LED1 Normal Condition: Activated (Red) Abnormal Condition: Deactivated This LED2 indicates the transmission state between the LED2 PCB1 and PCB2. (Green) Normal Condition: Flickering Abnormal Condition: Activated or Deactivated This LED3 indicates the...

  • Page 66: Protection And Safety Control

    Control system Service Manual 4.3. Protection and safety control 4.3.1. Compressor protection The following devices and their combinations protect the compressor High-Pressure switch This switch cuts out the operation of the compressor when the discharge pressure exceeds the setting. Oil heater This band heater protects against the oil carry-over during the cold starting, as the band heater is energized while the compressor is stopped.

  • Page 67: Standard Operation Sequence

    Control system Service Manual 4.4. Standard operation sequence 4.4.1. Cooling process Power to CH1 ~CH5 Power to Reverse phase O.U.: ON Power to PCB in phase (Alarm Code 05) O.U.: ON correct? Power to O.U. OFF Corect phase Only for indoor units Auto-louver 0 with auto-louver Reset...
  • Page 68 Control system Service Manual Cooling process (cont.) from 1 Start of AUTO-LOUVER only for air panel or Pressing Alternatively Indoor Unit with Auto- AUTO-LOUVER switch Louver Stop of AUTO-LOUVER Stop of Power to Y52C1~Y52C5: Power to MC1 ~ MC5 CMC1 ~ CMC5: OFF Stop of MOF1 ~ MOF4 After...

  • Page 69: Dry Operation

    Control system Service Manual 4.4.2. Dry operation Power to CH1 ~CH5 Power to Reverse phase O.U.: ON Power to PCB in phase (Alarm Code 05) O.U.: ON correct? Power to O.U. OFF Corect phase Only for indoor units Auto-louver 0 with auto-louver Reset Start of Transmission between...
  • Page 70 Control system Service Manual Dry operation (cont.) from 2 Start of AUTO-LOUVER only for air panel or Pressing Alternatively Indoor Unit with Auto- AUTO-LOUVER switch Louver Stop of AUTO-LOUVER Stop of Power to Power to Y52C: OFF MC1 ~ MC5 CMC1 ~ CMC5: OFF Stop of MOF1 ~ MOF4...

  • Page 71: Heating Process

    Control system Service Manual 4.4.3. Heating process Power to Power to CH1 ~CH5 O.U.: ON Reverse phase Power to PCB in phase (Alarm Code 05) O.U.: ON correct? Power to O.U. OFF Corect phase Only for indoor units Auto-louver 0 with auto-louver Reset Start of Transmission between...
  • Page 72 Control system Service Manual Heating process (cont.) from 1 Start of AUTO-LOUVER only for air panel or Pressing Alternatively Indoor Unit with Auto- AUTO-LOUVER switch Louver Stop of AUTO-LOUVER Stop of Power to Y52C1~Y52C5: Power to MC1 ~ MC5 CMC1 ~ CMC5: OFF Stop of MOF1 ~ MOF4 Power to...

  • Page 73: Defrost Operation Control

    Control system Service Manual 4.4.4. Defrost operation control Heating Operation Small Heating Temperature difference between Operation Time Outdoor temperature (Ta) and 40 minutes or above evaporating temperature (Te) at heat exchanger Defrosting Operation DEFROST on LCD appears according to indoor heat load RVR1: ON (RAS-14~48FSN2 only)

  • Page 74: Standard Control Functions

    Control system Service Manual 4.5. Standard control functions 4.5.1. Freezing protection during cooling process or dry operation Power Supply Cooling or Dry Operation Is compressor operated for more than *30 min.? *) The judging time varies under the condition Cooling or Dry Operation Gas pipe surface Higher than 0 ºC...

  • Page 75: Protection Control (In Cooling And Dry Operation)

    Control system Service Manual 4.5.2. Protection control (in cooling and dry operation) – Electronic expansion valve control for supercooling circuit Cooling operation Protection control for Td ≥ 100 ºC compressor frequency Compressor frequency PID control Fully opened of Exp. valve for plate heat exchanger (Liquid injection) At starting up and...

  • Page 76: Compressor Operation Control

    Control system Service Manual 4.5.3. Compressor operation control RAS-14/16FSN2 RAS-18/20FSN2 No. of running compr. Constant No. of running compr. speed Constant compressor speed compressor Inverter compressor Inverter frequency (Hz) compressor frequency (Hz) Target frequency (Hz) Target frequency (Hz) RAS-22/24FSN2 RAS-26/28FSN2 Constant Constant No.
  • Page 77 Control system Service Manual RAS-38~42FSN2 Constant No. of running compr. speed compressor Inverter compressor frequency (Hz) Target frequency (Hz) RAS-44~48FSN2 No. of running compr. Constant speed compressor Inverter compressor frequency (Hz) Target frequency (Hz) SMGB0049 rev.0 - 02/2009 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

  • Page 78: Outdoor Fan Control During Cooling Operation

    Control system Service Manual 4.5.4. Outdoor fan control during cooling operation Fan step at start Start Outlet air temp. Air flow (Tao) 10 sec. 50% air flow Tao < 5 ºC volume 11 ºC ≤ Tao < 18 ºC 18 ºC ≤ Tao < 25 ºC Fan step at start (see 25 ºC ≤...

  • Page 79: Restricted Control For Outdoor Units

    Control system Service Manual 4.6. Restricted control for Outdoor Units 1. Purpose: Minimize the frequency of the operation stoppage because of an alarm. 2. Procedure: Improving the protection control after the retry operation. (Protection control is activated before reaching of setting value for each protection control).
  • Page 80 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

  • Page 81: Available Optional Functions

    Available optional functions Service Manual Available optional functions Contents Available optional functions ___________________________________________________ 67 5.1. Outdoor units ____________________________________________________________ 68 5.1.1. Setting of external input and output functions ________________________________________ 68 5.1.2. Description of external input signals ________________________________________________ 70 5.1.3. Description of external output signals ______________________________________________ 73 5.1.4.

  • Page 82: Outdoor Units

    Available optional functions Service Manual 5.1. Outdoor units 5.1.1. Setting of external input and output functions On the outdoor unit printed circuit board, there are three input terminals to receive external signals and two output terminals to send signals outwards. These signals are available by setting as shown below. Control Function No.
  • Page 83 Available optional functions Service Manual In the case that the setting change (only with the mark (*) of the table in the previous page) is required at site, perform the following procedures. 1 Set DSW5-#7 of the outdoor PCB at the “ON” side while the main power to the outdoor unit is being supplied. By setting, function selection mode is available and the following appears on the 7-segment display.

  • Page 84: Description Of External Input Signals

    Available optional functions Service Manual 5.1.2. Description of external input signals Input 1 – Fixing heating operation mode (Control function No.1), Input 2 – Fixing cooling operation mode (Control function No.2) In the case that the fixing input terminals of the operation mode on the outdoor unit PCB1 are short-circuited, the operation mode can be fixed at the cooling or heating mode.
  • Page 85 Available optional functions Service Manual Input 3 – Snow sensor (Control function No.4) In the case that the input terminals of the snow sensor on the outdoor unit PCB1 are short-circuited during compressor stoppage, all the outdoor fan motors are operated at the full speed. However, if the compressor is called for compressor operation, the fan operation is changed to the normal operation.
  • Page 86 Available optional functions Service Manual Input 3 – Demand current control (Control function No.6 to 9) In the case that the demand input terminals on the outdoor unit PCB1 are short-circuited, the compressor frequency is controlled that the maximum limit of the outdoor running current is set 100%, 80%, 70% and 60%. (The maximum limit of the outdoor unit running current can be selected according to the item “Setting of external input and output functions”.) If the outdoor unit running current decreases beyond the maximum limit, the indoor unit is put under thermo-OFF...

  • Page 87: Description Of External Output Signals

    Available optional functions Service Manual 5.1.3. Description of external output signals The following signals can be picked up from the outdoor PCB. Refer to the table 5.2 for the required main parts. Output 1 – Operating signal (Control function No.1) Auxiliary relay contacting (RYa) is closed during the operation.
  • Page 88 Available optional functions Service Manual Output 2 – Compressor ON signal (Control function No.3) Auxiliary relay contacting (RYa) is closed during the compressor operation. – Setting Example Compressor ON Signal at Output 2 (between 1 and 3 pins of CN16) Auxiliary relay 3P Connector housing Outdoor unit...

  • Page 89: Optional Functions

    Available optional functions Service Manual 5.1.4. Optional functions     ↓ ↑ ↓ ↑ SEG2 SEG1 SEG2 SEG1 Not prepared Not Available Control of the Not Available indoor unit fan dur- ing Thermo-OFF in heating mode Available Available Long piping setting Not Available Cancelation of...
  • Page 90 Available optional functions Service Manual Circulator function at heating thermo-OFF Press “RSW1” and select the setting condition “1” at the circulator function at heating thermo-OFF “ ”. In case that the fan speed is changed to “LOW” at heating Thermo-OFF, there is a case that the room air temperature is too high at heating Thermo-OFF.
  • Page 91 Available optional functions Service Manual Frequency range (Cooling operation) Outdoor Outdoor Minimum Maximum Minimum Maximum Unit Unit Frequency Frequency Frequency Frequency Conditions Conditions Capacity Capacity (Hz) (Hz) (Hz) (Hz) (HP) (HP) When When night shift Except for the night shift (1) ni=1 is not set conditions on...
  • Page 92 Available optional functions Service Manual Cancellation of outdoor ambient temperature limit of heating Press “PSW1” and select the setting condition “1” at the cancellation of outdoor ambient temp. limit of heating “ ”. Then, this function can be set. The heating operation is continued under a high outdoor temperature. Operation in heating mode The factory-set limitation of the range Area of operation...
  • Page 93 Available optional functions Service Manual Change of defrost condition Press “PSW1” and select the setting condition “1” at the change of defrost condition “ ”. Setting condition Standard Specifications Cold area specification When change of defrost condition is NOT set When change of defrost condition is set Temperature Defrosting operation...
  • Page 94 Available optional functions Service Manual Fixing of demand function Press “PSW1” and select the setting condition “1”, so that the fixing of demand function “dE” can be set. However, it is not necessary to short-circuit the demand input terminals on the outdoor unit PCB. (Refer to the item “Input 3 –...
  • Page 95 Available optional functions Service Manual Wave function setting Press “PSW1” and select the setting condition “1”, so that the wave function setting “UE”. While this function is activated, the maximum limit of running current is changed from 60% to 100% as shown in the figure.
  • Page 96 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

  • Page 97: Test Run

    Test run Service Manual Test run Contents Test run __________________________________________________________________ 83 6.1. Checking procedure before the test run _______________________________________ 84 6.2. Test run procedure from the outdoor unit side ___________________________________ 86 6.3. Check list _______________________________________________________________ 87 6.4. Judgement systems for refrigerant amount _____________________________________ 90 6.4.1.

  • Page 98: Checking Procedure Before The Test Run

    Test run Service Manual 6.1. Checking procedure before the test run Test run should be performed according to the Table 6.2. And use the Table 6.1 for recording test run .  WARNING Do not operate the system until all the check points have been cleared . A) Check to ensure that the refrigerant piping and transmission between outdoor unit and indoor units are connected to the same refrigerant cycle.
  • Page 99 Test run Service Manual  CAUTION Caution for Insulation Resistance If total unit insulation resistance is lower than 1 megohm, the compressor insulation resistance may be low due to retained refrigerant in the compressor. This may occur if the unit has not been used for long periods . 1.

  • Page 100: Test Run Procedure From The Outdoor Unit Side

    Test run Service Manual 6.2. Test run procedure from the outdoor unit side The test run procedure from the outdoor unit side is shown below. You can set this DIP switch while the power source is ON Setting of Dip Switch (before shipment) Printed circuit board of the outdoor unit (PCB1) DSW4 Test run...

  • Page 101: Check List

    Test run Service Manual 6.3. Check list Check list on test run Client: Installer: Date: Outdoor unit model: Outdoor unit serial No.: Checker: Indoor unit model: Indoor unit serial No. Piping lenght [m] Additional refrigerant charge [kg] 1. General Check item Result Was the DIP switch DSW6 for the piping length in the outdoor unit set? Was the DIP switch DSW3 for the piping lift in the outdoor unit set?
  • Page 102 Test run Service Manual 3. Check item after sampling data a. Cooling process (if the outdoor temperature is higher than 15 ºC) Check item Standard Causes Result Is H1 (compressor frequency) + (CC Running horsepower of the – Low: excessive refrigerant; (number of running compressors) indoor units X 8Hz –...
  • Page 103 Test run Service Manual b. Heating process (if the outdoor temperature is higher than 0 ºC) Check item Standard Causes Result Is oE1,oE2 (outdoor unit expansion Total of oE1, oE2: total Low: excessive refrigerant; valves opening) abnormally low or high frequency of compressor x High: insufficient refrigerant.

  • Page 104: Judgement Systems For Refrigerant Amount

    Test run Service Manual 6.4. Judgement systems for refrigerant amount 6.4.1. Automatic judgement system for refrigerant amount This function is available under the following conditions: − Total piping length is 300 m or more. − The indoor and outdoor air temperature is within the applicable range as shown in the figure: Before performing this function, charge the additional refrigerant according to the total piping length.

  • Page 105: Simple Judgement System For Refrigerant Amount

    Test run Service Manual d) No. 1 or No. 4 pin of DSW4 is ON. e) At starting the judgement system operation for the refrigerant amount, the indoor and outdoor air temperature is beyond the applicable range. f) The refrigerant cycle is varied widely. In case except a) to e), it may be impossible to utilize the judgement because that the refrigerant cycle is varied widely.
  • Page 106 Test run Service Manual 3. Calculate the total frequency (=H1(Inverter frequency)+Constant compressor reduced frequency) according to the following table: Converted frequency of constant speed compressor Outdoor Unit Model RAS-14/16FSN2 – – – RAS-18/20FSN2 – – RAS-22/24FSN2 – – RAS-26/28FSN2 – –...

  • Page 107: Troubleshooting

    Troubleshooting Service Manual Troubleshooting Contents Troubleshooting ____________________________________________________________ 93 7.1.2. Emergency operation ___________________________________________________________ 95 7.1.3. Failure of the power supply to the indoor unit and the remote control switch _______________ 101 7.1.4. Abnormal transmission between the remote control switch and the indoor unit _____________ 102 7.1.5.

  • Page 108: Initial Troubleshooting

    Troubleshooting Service Manual 7.1. Initial troubleshooting 7.1.1. Checking by means of the 7-segment display Simple checking procedure by means of the 7-segment display 1. Turn on all the indoor units which are connected to the outdoor unit. 2. Turn on the outdoor unit 3.

  • Page 109: Emergency Operation

    Troubleshooting Service Manual 7.1.2. Emergency operation Emergency mode operation (RAS-14FSN2 to RAS-48FSN2 Only) 1. Emergency mode operation from Remote Control Switch If compressor/fan motor is failed, emergency operation mode is available to change from the remote control switch. Even if the compressor is failed, the air conditioning operation is continuously available until the troubleshooting is performed.
  • Page 110 Troubleshooting Service Manual 2. Emergency mode operation from PCB for inverter compressor failure This operation is an emergency operation by the constant speed compressor when the inverter compressor is failed. Alarms corresponding to inverter compressor failure 04: Abnormality of inverter transmitting 06: Abnormality of inverter voltage 23: Failure of discharge gas thermistor 48: Inverter overcurrent protection activation...
  • Page 111 Troubleshooting Service Manual 3. Emergency mode operation from PCB for constant speed compressor failure This operation is an emergency operation by the other compressor when the constant speed compressor is failed. Alarms corresponding to constant speed compressor failure 23: Failure of discharge gas thermistor 39: Abnormality of running current at constant speed compressor a Procedure...
  • Page 112 Troubleshooting Service Manual Method of collecting refrigerant 1 In case that compressor operates Perform only when collecting refrigerant is required. Process Procedure Remarks Turn OFF the main switch of O.U. Connect manifold to the check joint at low and high pressure sides in O.U.
  • Page 113 Troubleshooting Service Manual Process Procedure Remarks In case collecting refrigerant oil in oil separator is required: – This work is necessary for replacing comp. and return oil – Connect the charge hose to the charge port of return oil circuit. circuit.
  • Page 114 Troubleshooting Service Manual 2 In case that compressor does not operate Perform only when collecting refrigerant of outdoor unit is required. (Perform the replacing compressor and oil return circuit if necessary.) Process Procedure Remarks Turn OFF the main switch of O.U. Connect manifold to the check joint* at low and high * Not the check joint of liquid/gas stop valves.

  • Page 115: Failure Of The Power Supply To The Indoor Unit And The Remote Control Switch

    Troubleshooting Service Manual 7.1.3. Failure of the power supply to the indoor unit and the remote control switch The LED and the LCD are not indicated. Not operated If the fuses are blown out or a breaker is activated, investigate the cause of the overcurrent and take the necessary action.

  • Page 116: Abnormal Transmission Between The Remote Control Switch And The Indoor Unit

    Troubleshooting Service Manual 7.1.4. Abnormal transmission between the remote control switch and the indoor unit RUN LED on the remote control switch: Flickering every 2 seconds. Action Phenomenon Cause Check item (Turn OFF the main switch) Disconnection or insufficient contacting Check the cable and the Repair the cable or connect the of the remote control cable...

  • Page 117: Abnormal Operation Of The Devices

    Troubleshooting Service Manual 7.1.5. Abnormal operation of the devices In the case that no abnormality (Alarm Code) is indicated on the remote control switch, and normal operation is not available, take necessary action according to the procedures mentioned below. Action Phenomenon Cause Check item...
  • Page 118 Troubleshooting Service Manual Abnormal operation of the devices (Cont.) Action Phenomenon Cause Check item (Turn OFF the main switch) Check the setting condition of "thermistor of remote control switch." by means of the optional setting Setting and control: "00": Control by means of the indoor thermistor for the The Comp.
  • Page 119 Troubleshooting Service Manual Abnormal operation of the devices (Cont.) Action Phenomenon Cause Check item (Turn OFF the main switch) Failure of the Thermistor Check the Thermistor by Replace or Correctly Failure of the Discharge means of the connect the wiring when Air Temp.
  • Page 120 Troubleshooting Service Manual Abnormal operation of the devices (Cont.) Action Phenomenon Cause Check item (Turn OFF the main switch) Indoor heat load is greater than the cooling capacity Calculate the heat load Use a bigger unit Correctly charge the Gas leakage or shortage Measure superheat refrigerant after repairing of refrigerant...
  • Page 121 Troubleshooting Service Manual Abnormal operation of the devices (Cont.) Action Phenomenon Cause Check item (Turn OFF the main switch) Check clogging of the outdoor unit heat Remove the clogging exchanger? Obstacles at inlet or the outlet of outdoor unit heat Remove the obstacles Insufficient air flow to exchanger?
  • Page 122 Troubleshooting Service Manual Abnormal operation of the devices (Cont.) Action Phenomenon Cause Check item (Turn OFF the main switch) Replace the unit with Indoor heat load is greater than the heating capacity Calculate the heat load a bigger unit Correctly charge the Gas leakage or refrigerant after the insufficient refrigerant...
  • Page 123 Troubleshooting Service Manual Abnormal operation of the devices (Cont.) Action Phenomenon Cause Check item (Turn OFF the main switch) Check the filter for a Remove the clogging clogging Insufficient air flow to Check for any obstacles at the indoor unit heat the inlet or the outlet of the Remove the obstacles exchanger...
  • Page 124 Troubleshooting Service Manual Abnormal operation of the devices (Cont.) Action Phenomenon Cause Check item (Turn OFF the main switch) Remove the foreign Foreign particles inside of the fan casing Visually inspect it particles Adjust the position of the Indoor unit fan runner is hitting the casing Visually inspect it fan runner Adjust the position of the...

  • Page 125: Troubleshooting Procedure

    Troubleshooting Service Manual 7.2. Troubleshooting procedure 7.2.1. Alarm code indication of remote control switch If the RUN LED flickers for 2 seconds, there is a failure in the transmission between the Indoor Unit and the Remote Abnormal Refrigerant Abnormal Indoor Control Switch.
  • Page 126 Troubleshooting Service Manual Code Category Content of Abnormality Leading Cause Abnormality of Running Current at Constant Compressor Overcurrent, Blown Fuse of Failure of Current Sensor. Compressor Pressure Ratio Decrease Protection Activating Failure of Compressor, Inverter Overload to Indoor in Cooling. High Temperature of Low Pressure Increase Protection Activating Outdoor Air In Heating Expansion Valve Open Lock Protection...

  • Page 127: Troubleshooting By Alarm Code

    Troubleshooting Service Manual 7.2.2. Troubleshooting by alarm code Alarm code Description Activation of the safety device in the indoor unit The RUN LED flickers and "ALARM" is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB.
  • Page 128 Troubleshooting Service Manual Alarm code Description Activation of the safety device in the outdoor unit The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are indicated on the display of the outdoor unit PCB1.
  • Page 129 Troubleshooting Service Manual Action Phenomenon Cause Check item (Turn OFF the main switch) Check the heat exchanger Remove the dust or the for dust or for clogging clogging Check the air filter for dust Remove the dust Insufficient air flow to the heat exchanger Check for any obstacles at (Outdoor heat exchanger during the cooling the inlet or the outlet of the...
  • Page 130 Troubleshooting Service Manual Action Phenomenon Cause Check item (Turn OFF the main switch) Check for clogging Remove the clogging Check the connect wiring and Replace the connector the connectors Faulty or malfunction of the Check the operation sound Replace the coil expansion valve from the coil Check the discharge gas...
  • Page 131 Troubleshooting Service Manual Alarm code Description Abnormal transmission between the indoor units and the outdoor unit The RUN LED flickers and "ALARM" is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 132 Troubleshooting Service Manual From previous page Is LED3 (yellow ON, Is LED3 on PCB even if CN2 of PCB is Faulty PCB removed? Check other Indoor Units Check the wiring between the Is LED 3 (yellow) on PCB outdoor unit and the indoor flickering more than once in 10 units units or the fuse (EF1) seconds?
  • Page 133 Troubleshooting Service Manual Action Phenomenon Cause Check item (Turn OFF the main switch) Measure the voltage by means Power failure or no power supply Supply the power of the tester Check the insulation material for Remove the short circuit and Short circuit between wires breaks replace the fuse...
  • Page 134 Troubleshooting Service Manual Alarm code Description Abnormal transmission between Inverter and the Outdoor Unit PCB1, 2 The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 135 Troubleshooting Service Manual Alarm code Description Abnormality of picking up phase signal The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 136 Troubleshooting Service Manual Alarm code Description Excessively low or high voltage for the inverter The RUN LED flickers and "ALARM" is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The alarm code is displayed on the display of the outdoor unit PCB1.
  • Page 137 Troubleshooting Service Manual Alarm code Description Excessively low or high voltage for fan module  The RUN LED flickers and "ALARM" is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 138 Troubleshooting Service Manual Alarm code Description Decrease of discharge gas superheat The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB.
  • Page 139 Troubleshooting Service Manual Position of the Thermistor Thermistor ref. Display Drive Number of Unit HP Thermistor position (a) compressors THM8 Inverter 8~12HP d1 THM9 14~16HP d2 THM12 18~28HP d3 Constant speed THM13 30~36HP d4 THM18 38~48HP d5 Action Phenomenon Cause Check item (Turn OFF the main switch) Ref.
  • Page 140 Troubleshooting Service Manual Alarm code Description Excessively high discharge gas temperature at the top of the compressor chamber The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 141 Troubleshooting Service Manual Position of the Thermistor Thermistor ref. Display Drive Number of Unit HP Thermistor position (a) compressors THM8 Inverter 8~12HP d1 THM9 Constant 14~16HP d2 speed THM12 18~28HP d3 THM13 30~36HP d4 THM18 38~48HP d5 Action Phenomenon Cause Check item (Turn OFF the main switch) Ref.
  • Page 142 Troubleshooting Service Manual Alarm code Description Activation of the protection device for the outdoor AC fan motor (RAS-26FSN2 to RAS-48FSN2 Only) The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 143 Troubleshooting Service Manual Alarm code Description Abnormal operation of thermistor for the indoor unit air inlet temperature (air inlet thermistor) The RUN LED flickers and "ALARM" is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 144 Troubleshooting Service Manual Alarm code Description Abnormal operation of the thermistor for the indoor discharge air temperature (air outlet thermistor) The RUN LED flickers and "ALARM" is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 145 Troubleshooting Service Manual Alarm code Description Abnormal operation of the thermistor for the indoor unit heat exchanger liquid refrigerant pipe temperature (freeze protection thermistor) The RUN LED flickers and "ALARM" is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB.
  • Page 146 Troubleshooting Service Manual Alarm code Description Abnormal operation of the thermistor for the indoor unit heat exchanger gas refrigerant pipe temperature (gas piping thermistor) The RUN LED flickers and "ALARM" is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 147 Troubleshooting Service Manual Alarm code Description Activation of the protection device for the indoor fan motor (RCI) The RUN LED flickers and "ALARM" is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section, and the alarm code is indicated on the display of the outdoor unit PCB1.
  • Page 148 Troubleshooting Service Manual Alarm code Description Activation of the protection device for the indoor fan motor (RPK) The RUN LED flickers and "ALARM" is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB.
  • Page 149 Troubleshooting Service Manual Alarm code Description Activation of the protection device for the indoor fan motor (except RCI and RPK) The RUN LED flickers and "ALARM" is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB.
  • Page 150 Troubleshooting Service Manual Alarm code Description Abnormal operation of the high-pressure sensor for the outdoor unit The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 151 Troubleshooting Service Manual Description Alarm code Abnormal operation of the thermistor for the outdoor temperature (outdoor unit ambient thermistor) The RUN LED flickers and "ALARM" is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 152 Troubleshooting Service Manual Description Alarm code Abnormal operation of thermistor for discharge gas temperature on the top of compressor chamber The RUN LED flickers and "ALARM" is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 153 Troubleshooting Service Manual Alarm code Description Abnormal operation of the thermistor for the evaporating temperature during the heating process (outdoor unit) The RUN LED flickers and "ALARM" is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB.
  • Page 154 Troubleshooting Service Manual Alarm code Description Abnormal operation of the low-pressure sensor for the outdoor unit The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB.
  • Page 155 Troubleshooting Service Manual Alarm code Description Incorrect capacity setting or combined capacity between Indoor Units and Outdoor Unit The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 156 Troubleshooting Service Manual Alarm code Description Incorrect indoor number setting The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 157 Troubleshooting Service Manual Alarm code Description Abnormality of picking up circuit for protection (Outdoor Unit) The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 158 Troubleshooting Service Manual Alarm code Description Abnormality of running current at constant compressor The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 159 Troubleshooting Service Manual Action Phenomenon Cause Check item (Turn OFF Main Switch) Excessively high voltage or low Operate within 380V±10%(50Hz) voltage of the power source or 415V±10%(50Hz) Excessively large running current Imbalance among phases at the Adjust the voltage between each of the compressor motor power source phase...
  • Page 160 Troubleshooting Service Manual Alarm code Description Activation for protecting the system from the low compression ratio The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 161 Troubleshooting Service Manual Alarm code Description Activation for protecting the system from excessively low suction pressure The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 162 Troubleshooting Service Manual Alarm code Description Activation for protecting the system from excessively high discharge pressure The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 163 Troubleshooting Service Manual Alarm code Description Activation for protecting the system from excessively low suction pressure (protection from the vacuum operation) The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 164 Troubleshooting Service Manual Alarm code Description Activation of inverter overcurrent protection device (1) The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 165 Troubleshooting Service Manual Alarm code Description Activation of inverter overcurrent protection device (2) The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 166 Troubleshooting Service Manual Alarm code Description Abnormality of current transformer The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB.
  • Page 167 Troubleshooting Service Manual Alarm code Description Inverter error signal detection The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB.
  • Page 168 Troubleshooting Service Manual Alarm code Description Increase in the inverter fin temperature The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB.

  • Page 169: Inverter Failure

    Troubleshooting Service Manual Alarm code Description Inverter failure The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
  • Page 170 Troubleshooting Service Manual Alarm code Description 56 57 58 Abnormal operation of DC fan motor protection The RUN LED flickers and “ALARM” is displayed on the remote control switch. The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.

  • Page 171: Compressor Protection

    Troubleshooting Service Manual Alarm code Description Compressor protection This alarm code is displayed when one of the following alarms occurs three times within six hours. If the outdoor unit operates continuously without removing the cause of the alarm, the compressor may be seriously damaged. Alarm Code: Content of Abnormality Tripping of the protection device in the outdoor unit...

  • Page 172: Troubleshooting In Check Mode

    Troubleshooting Service Manual 7.2.3. Troubleshooting in check mode Use the ‘OK’ switch of the remote control in the following cases: 1. When the RUN LED is flickering. 2. To trace back the cause of the malfunction after restarting from the stoppage while the RUN LED is flickering.

  • Page 173: Temperature Indication

    Troubleshooting Service Manual Although the wireless controller is used for the wall type  indoor unit with the built-in receiver part, you can check the NOTES: alarm code by connecting the PC-ART. 1. The unit does not operate by pressing the operation switch.
  • Page 174 Troubleshooting Service Manual Indication of micro-computer input/output Part name Relay Heating thermo ON Alarm Micro-computer input/  Relay for drain pump (MD) and/or Cooling thermo ON dew heater (EHW). output in indoor unit Relay for electric heater (CEH) ↓ Y211 Relay for 4-way valve Y52C1 Relay for compressor...
  • Page 175 Troubleshooting Service Manual Compressor pressure/frequency indication Discharge pressure H 18 (high) (x 0.1 MPa) ↓ Suction pressure (low) H2 04 This is an indication for internal information for the remote (x 0.01 MPa) control switch. This does not have any specific meaning ↓...
  • Page 176 Troubleshooting Service Manual Contents of the Check mode 2 When more than three indoor units are connected to one remote control switch, the latest data of only the first three indoor units that are connected serially are displayed. If you press the part " ...
  • Page 177 Troubleshooting Service Manual Compressor pressure/frequency indication Discharge pressure 99 18 (high) (x 0.1 MPa) ↓ Suction pressure (low) 9A 04 (x 0.01 MPa) ↓ This indicates the internal information for the remote control 9b 44 Control information switch. This does not have any specific meaning ↓...

  • Page 178: Checking `Procedure

    Troubleshooting Service Manual 7.2.4. Troubleshooting by means of the 7 segment display Simple checking by 7-segment display Turn ON all Indoor Inits connected During auto-addressing, the following items can be checked using the to the Outdoor Unit outdoor unit’s on-board 7-segment LED display: 1 Disconnection of power supply to the indoor unit.
  • Page 179 Troubleshooting Service Manual  Note: Shadowed items are applicable only to FSN2 series Item Indication Data Values Units Total of Thermo-ON indoor unit o P 3 2 0 0 ~ 9999 x1/8 HP capacity Running frequency of inverter 0 ~ 115 compressor MC1 Number of running 0 ~ 5...
  • Page 180 Troubleshooting Service Manual Item Indication Data Values Units Discharge gas temp. on the top  d 5 1 ~ 142 ºC of compressor MC5 (TD5) (for 38 to 48HP) -46 ~ 80 Evaporating temperature TE1  E 1 ºC (-127 = Open circuited) at heating (127 = Short circuited) Evaporating temperature TE2...
  • Page 181 Troubleshooting Service Manual Item Indication Data Values Units  L O0 Indoor unit heat exchanger liquid pipe temperature (freeze -62 ~ 127 ºC protection) (from 0 to 63)  L 63  G O0 Indoor unit heat exchanger gas -62 ~ 127 ºC pipe temperature.
  • Page 182 Troubleshooting Service Manual Item Indication Data Values Units Discharge gas temp. decrease 0: not in operation c 1 5 protection degeneration control 1: in operation Discharge gas temp. increase 0: not in operation c 1 6 protection degeneration control 1: in operation Current protection 0: not in operation c 1 7...
  • Page 183 Troubleshooting Service Manual Item Indication Data Values Units (Hystory No. 1) Integrated hours at alarm in n o 01 The latest failure indicated n o 02 A C 48 (Hystory No. 2) Cause of stoppage Failure history i  2 ITC indication (Hystory No.

  • Page 184: Troubleshooting

    Troubleshooting Service Manual 7.2.5. Running current of the compressor Inverter primary current The inverter primary current is estimated from the running current of the compressor MC1 displayed on the 7 segment display, as chart. 380~415V 25 – 20 – Upper limit 15 –...
  • Page 185 Troubleshooting Service Manual Cause code of stoppage for Fan Controller (content of check item “FC”) Code Cause Automatic stoppage of the transistor module (IPM Error) (overcurrent, decrease voltage, increase temperature) Instantaneous overcurrent Abnormal inverter fin thermistor Electronic thermal activation Inverter voltage decrease (Insufficient Voltage) Voltage increase Abnormal Inverter transmission Reset of micro-computer for inverter...

  • Page 186: Protection Control Code On The 7-Segment Display

    Troubleshooting Service Manual 7.2.6. Protection control code on the 7-segment display 1. Protection control code is displayed on 7-segment when a protection control is activated. 2. Protection control code is displayed while function is working, and goes out when released. 3.

  • Page 187: Activating Condition Of The Protection Control Code

    Troubleshooting Service Manual 7.2.7. Activating condition of the protection control code To monitor the conditions such as the temperature change and others, the control of the frequency and other controls are performed by the protection control in order to prevent the abnormal operations. The activating conditions of the protection control are shown in the table below: ...
  • Page 188 Troubleshooting Service Manual Code Protection control Activating condition Remarks Vacuum/discharge gas In Case of Ps<0.09MPa for over 12 minutes, or When it activates three times in one hour, the temperature increase discharge gas temperature ≥ 132°C for over ten alarm codes “47” (Ps) or “08” (Discharge gas) retry minutes or discharge gas temperature ≥...

  • Page 189: Procedure For Checking Each Main Part

    Troubleshooting Service Manual 7.3. Procedure for checking each main part 7.3.1. Self-checking procedure of PCB by means of the Remote Control Switch Use the following troubleshooting procedure for testing the PCB in the indoor unit and the outdoor unit: Press Stop operation Press both switches for three...
  • Page 190 Troubleshooting Service Manual If you are using a wireless remote control switch with the built-in receiver part of the wall-type indoor unit and you need to perform the above checking, perform the following procedure: 1. Turn OFF the power supply. 2.

  • Page 191: Self-Checking Procedure Of The Remote Control Switch

    Troubleshooting Service Manual 7.3.2. Self-Checking procedure of the Remote Control Switch Cases where the CHECK switch is used: 1. If the remote control switch displays a malfunction. 2. For the regular maintenance check. Turn ON the power source LCD Indication Indicating period (sec.)
  • Page 192 Troubleshooting Service Manual The LCD indication changes as shown below. The detected temperature of If the indicators “” or “FF” are displayed at the “A” part, the remote control the remote control thermostat is thermostat is abnormal. displayed at the (A) part in the figure below.

  • Page 193: Self-Checking Procedure Of The Indoor Unit Pcb (Only For Rpk)

    Troubleshooting Service Manual 7.3.3. Self-Checking procedure of the Indoor Unit PCB (only for RPK) Self-checking procedure by means of the relays on the indoor unit PCB – To check the abnormal operation on the indoor unit PCB due to a malfunction. –...

  • Page 194: Procedure Of Checking Other Main Parts

    Troubleshooting Service Manual TROUBLESHOOTING 7.3.4. Procedure of checking other main parts 1.3.3 Procedure of Checking Other Main Parts (1) High Voltage Discharge Work for Replacing Parts High voltage discharge work for replacing parts <Perform this high voltage discharge work to avoid an electric shock.> WARNING Procedure Perform this high voltage discharge work to avoid an electric shock...
  • Page 195 Troubleshooting Service Manual Checking procedure for transistor module (IPM) Remove all the terminals of the transistor module before check. If items (a) to (d) are performing and the results are satisfactory, the transistor module is normal. Measure it under 1kΩ range of a tester. &...
  • Page 196 Troubleshooting Service Manual Checking procedure for diode module. Outer appearance and internal circuit of diode module & CAUTION: Do not use a digital tester. Terminals Remove all the terminals of the diode module before check. If items (a) to (d) are performing and the results are satisfactory, the transistor module is normal.
  • Page 197 Troubleshooting Service Manual TROUBLESHOOTING Checking of Fan Module (6) Checking of Fan Module Before this work, check to ensure that LED201 (Red) of the PC Before this work, check to ensure that LED201 (Red) of the PCB2 is off. Disconnect all the wirings connected to the fan module as sho Disconnect all the wirings connected to the fan module as shown in the right figure.
  • Page 198 Troubleshooting Service Manual Checking procedure for the electronic expansion valve Indoor unit electronic expansion valve Outdoor unit electronic expansion valve Check the liquid pipe temperature during the It is abnormal if the liquid pipe pressure does heating process. not increase during the cooling process. Locked with fully closed It is abnormal if the temperature does not increase.
  • Page 199 Troubleshooting Service Manual Other parts Name of parts Model Resistance (Ω) (at 20 ºC) Solenoid valve for gas Coil: SR10PA + Body: SR-10D 1,250 bypass Reversing valve Coil: STF-01AJ502D1 (50Hz) 1,130 Body: STF-0712G (8-12HP) Body: VHV-1511G (14-24HP) Body: VHV-1516G (26-48HP) Compressor Motor (for E656DHD 0.51 Inverter Compressor)
  • Page 200 Troubleshooting Service Manual Checking of compressor Check list on compressor Client: Model: Date: Serial No. Production date: Checker: Check item Check method Result Remarks Are discharge gas thermistors 1. Are the wires of each thermistor correctly connected THM8, THM9, THM12, THM13 and in a visual inspection? THM18 correctly connected? 2.
  • Page 201 Troubleshooting Service Manual Additional Information for “Check list on compresssor” Check item Additional information (mechanism of the compressor failure) 1 & 2 The discharge gas temperature (Td1) controls the liquid refrigerant return volume to the compressor when only the compressor No.1 is operating. If Td1 and Td2 are connected in the reverse order, the liquid refrigerant return volume will decrease even if the actual discharge gas temperature is high, because PCB1 is checking the wrong compressor temperature.
  • Page 202 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

  • Page 203: Spare Parts

    Spare parts Service Manual Spare parts Contents Spare parts ______________________________________________________________ 189 8.1. RAS-8~12FSN2 - Cabinet and fan ________________________________________________ 190 8.2. RAS-8~12FSN2 - Refrigerant cycle _______________________________________________ 191 8.3. RAS-8~12FSN2 - Eelectrical equipment ___________________________________________ 192 8.4. RAS-14~24FSN2 - Cabinet and fan _______________________________________________ 193 8.5.

  • Page 204: 12Fsn2 - Cabinet And Fan

    Spare parts LOCATION OF SPARE PARTS IN THE UNIT Service Manual CABINET AND FAN MODEL: RAS-8FSN2 8.1. RAS-8~12FSN2 - Cabinet and fan RAS-10FSN2 RAS-12FSN2 U98C U34A U98E U34D U34B U98A U98F U98D U15A U98B U65H U34C U98H U98G D-RAS-8FSN2, D-RAS-10FSN2, D-RAS-12FSN2 SMGB0049 rev.0 - 02/2009 - 35 - https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

  • Page 205: 12Fsn2 - Refrigerant Cycle

    LOCATION OF SPARE PARTS IN THE UNIT Spare parts REFRIGERANT CYCLE MODEL: RAS-8FSN2 RAS-10FSN2 Service Manual RAS-12FSN2 8.2. RAS-8~12FSN2 - Refrigerant cycle U40A 10 and 12HP U77A U30D U77C U42A B-5x14 U21C U21D U77A U42B U77C U30D U30E U15C U77B U77A U77C U77C...

  • Page 206: 12Fsn2 - Eelectrical Equipment

    LOCATION OF SPARE PARTS IN THE UNIT Spare parts ELECTRICAL EQUIPMENT MODEL: RAS-8FSN2 RAS-10FSN2 Service Manual (380-415V/50Hz, 380V/60Hz) RAS-12FSN2 8.3. RAS-8~12FSN2 - Eelectrical equipment U82A U65F U65F U82B U85B U74A U15D U14B U65D U04B U04A U74B U85A U65C U74C U65G U65A U14A U65B...

  • Page 207: 24Fsn2 - Cabinet And Fan

    Spare parts LOCATION OF SPARE PARTS IN THE UNIT Service Manual CABINET AND FAN MODEL: RAS-14FSN2 RAS-16FSN2 RAS-18FSN2 8.4. RAS-14~24FSN2 - Cabinet and fan RAS-20FSN2 RAS-22FSN2 RAS-24FSN2 U34D U98J U15A U65G U34A U34D U34A U98C U98A U98E U34B U98F U98D U34C U98B U98i...

  • Page 208: 24Fsn2 - Refrigerant Cycle

    Spare parts LOCATION OF SPARE PARTS IN THE UNIT Service Manual REFRIGERANT CYCLE MODEL: RAS-14FSN2 RAS-16FSN2 RAS-18FSN2 8.5. RAS-14~24FSN2 - Refrigerant cycle RAS-20FSN2 RAS-22FSN2 RAS-24FSN2 U40B U21C U40A U21E U15E U30E U42C U21C U42C U21D U77A U77A U77D U77A U77D U77D U15D U30C...

  • Page 209: 48Fsn2 - Electrical Equipment

    ELECTRICAL EQUIPMENT MODEL: RAS-14FSN2 RAS-32FSN2 RAS-16FSN2 RAS-34FSN2 (380-415V/50Hz, 380V/60Hz) Spare parts RAS-18FSN2 RAS-36FSN2 RAS-20FSN2 RAS-38FSN2 Service Manual RAS-22FSN2 RAS-40FSN2 RAS-24FSN2 RAS-42FSN2 RAS-26FSN2 RAS-44FSN2 8.6. RAS-14~48FSN2 - Electrical equipment RAS-28FSN2 RAS-46FSN2 RAS-30FSN2 RAS-48FSN2 U82A U65E U65E U72A U82B U85B U85C U74A U14B U65B U65A...

  • Page 210: 48Fsn2 - Electrical Equipment

    ELECTRICAL EQUIPMENT MODEL: RAS-14FSN2 RAS-32FSN2 RAS-16FSN2 RAS-34FSN2 (380-415V/50Hz, 380V/60Hz) Spare parts RAS-18FSN2 RAS-36FSN2 RAS-20FSN2 RAS-38FSN2 RAS-22FSN2 RAS-40FSN2 Service Manual RAS-24FSN2 RAS-42FSN2 RAS-26FSN2 RAS-44FSN2 8.7. RAS-14~48FSN2 - Electrical equipment RAS-28FSN2 RAS-46FSN2 RAS-30FSN2 RAS-48FSN2 RAS-14 to 24FSN2 U72C U04D U72B U04C RAS-26 to 48FSN2 U72C U72B Only for...
  • Page 211 Spare parts Service Manual Applicable Number Remarks Part name models RAS U01A 08HP~44HP HIGH PRESSURE PRESSURE SW U01B 08HP~44HP PRESSURE SENSOR U01C 08HP~44HP U04A 08HP~12HP FOR DC FAN 12A 14HP~44HP FOR DC FAN (MOF1, 2) 12A U04B 08HP~12HP FOR INV. COMP. 40A 14HP~44HP FOR INV.
  • Page 212 Spare parts Service Manual Applicable Number Remarks Part name models RAS U30A 08HP~44HP U30C 08HP~44HP U30D 08HP~44HP U30E 08HP~44HP U30F 26HP~44HP U32A 08HP~12HP 14HP~44HP FOR INV. COMP. U32B 08HP~12HP VIBRATION ABSORBER 14HP~44HP FOR CONSTANT COMP. U32C 14HP~44HP U34A 08HP~44HP OUTLET U34B 08HP~44HP INLET (LEFT SIDE)
  • Page 213 Spare parts Service Manual Applicable Number Remarks Part name models RAS U77A 08HP~12HP SVF, SVA, SVB 14HP~26HP SVF, SVA1, 2, SVB, SVG SOLENOID VALVE 30HP~44HP SVF, SVA1, 2, 3, 4 SVB, SVG U77B 08HP~44HP U77C 08HP~12HP SVF, SVA, SVB, SVC 14HP SVF, SVA1, 2, SVB, SVG, SVC 18HP~26HP...
  • Page 214 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

  • Page 215: Servicing

    Servicing Service Manual Servicing Contents Servicing ________________________________________________________________ 201 9.1.1Outdoor units FSN2 _______________________________________________________ 202 9.1.1. Removing air intake grille _______________________________________________________ 202 9.1.2. Removing front service panel ____________________________________________________ 203 9.1.3. Removing fan guard net ________________________________________________________ 204 9.1.4. Removing outdoor fan _________________________________________________________ 205 9.1.5.

  • Page 216: 1Outdoor Units Fsn2

    Servicing Service Manual 9.1.1Outdoor units FSN2 9.1.1. Removing air intake grille At Right and Left Side At Rear Side 1 Remove screws at the bottom of the air intake grille. 1 Remove six (6) screws fixing each side of the air intake grille.

  • Page 217: Removing Front Service Panel

    Servicing Service Manual 9.1.2. Removing front service panel Remove screws fixing the front service panel. Service Panel: eight (8) screws, Front Panel: six (6) NOTE: screws When attaching / removing the service panel, pay attention not to be injured with the plate edge. Slightly lift the panels upward and remove them.

  • Page 218: Removing Fan Guard Net

    Servicing Service Manual 9.1.3. Removing fan guard net Remove six (6) screws fixing the fan guard net. Remove the fan guard net. NOTE: DO NOT apply the excessive force to the shroud (plastic part) to avoid deformation and breakage. RAS-12FSN2 (Example) Screw Fan Guard Net Shroud...

  • Page 219: Removing Outdoor Fan

    Servicing Service Manual 9.1.4. Removing outdoor fan 1 Remove the fan guard net according to the item “Removing Fan Guard Net”. RAS-8FSN2 to RAS-12FSN2 RAS-14FSN2 to RAS-24FSN2 DC Fan Motor (MOF2) DC Fan Motor (MOF1) DC Fan Motor RAS-26FSN2 to RAS-42FSN2 RAS-44FSN2 to RAS-48FSN2 AC Fan Motor (MOF4) DC Fan Motor (MOF3)
  • Page 220 Servicing Service Manual 3 Removing Wire NOTES: – Remove the service panel and the electrical control 1. The cord outlet end of the motor should be box cover according to the item 2.2 “Removing downward-facing when mounting the motor. Front Service Panel” and the item 2.15 “Removing (Make the wire trap.) Electrical Control Box”.

  • Page 221: Removing Compressor

    Servicing Service Manual 9.1.5. Removing compressor When collect the refrigerant by operating the compressor, refer to “Method of Collecting Refrigerant”. In other cases, collect the refrigerant before starting the work, and turn OFF the power source of the unit. NOTE: NOTE: Do NOT touch the compressor and the high pressure The thermistor holder, thermistor fixing plate...
  • Page 222 Servicing Service Manual 4 Release the bind lace of the waterproof cover for removing. NOTES: 1. When removing the waterproof cover, pay 3. The aluminium sheet is conductive. If the attention not to deform the piping around the aluminium sheet is damaged, it may lead to cover.
  • Page 223 Servicing Service Manual 6 Release the spring to remove the oil heater. Spring Spring Oil heater Oil heater Constant Speed Compressor (E656DH, E1000GH) Inverter Compressor (E656DHD) 7 Disconnect the discharge and the suction pipes from the compressor. Suction pipe Check that the pipe inside pressure is equal to the atmospheric pressure.
  • Page 224 Servicing Service Manual 8 Disconnect the oil discharge pipe from the compressor. When disconnecting, pinch and cut the pipe at the closer position to the compressor from the brazing part, so that the refrigerant oil remained inside the compressor does not overspill from oil discharge pipe.
  • Page 225 Servicing Service Manual 10 Remove the nuts fixing the compressor and remove the compressor. Inverter Compressor: three (3) nuts, Constant Speed Compressor: four (4) nuts NOTES: 1. When removing the compressor, pay attention not to contact with surrounding pipes. If contacted, pipe may deform. Nut fixing position (only for constant speed compressor) 2.
  • Page 226 Servicing Service Manual 11 Take out the remaining refrigerant oil in the compressor from the discharge pipe, and measure the oil quantity. This procedure should be performed for constant speed compressor or the inverter compressor replacement. NOTES: 1. Additional refrigerant oil charge is required if: remaining refrigerant oil quantity in the old compressor >...
  • Page 227 Servicing Service Manual 12 Mount the new compressor. When attaching the nut at the front side, pay attention not to deform the discharge piping. Perform the brazing according to the following order: a) Oil Discharge Pipe b) Discharge Pipe c) Suction Pipe NOTES: 1.
  • Page 228 Servicing Service Manual 13 Charge the refrigerant oil calculated in the procedure (11) from the union(T) at the return oil circuit. Connect the charging hose with the union while vacuuming from the check joint at the low pressure side, then start suctioning.
  • Page 229 Servicing Service Manual 15 Wind the oil heater around the compressor. NOTES: Oil heater mounting position: Back to the original setting 1. If the power line or the oil heater lead line (Refer to the procedure (6)) contacts with the high temperature part such 16 Attach the waterproof cover.
  • Page 230 Servicing Service Manual 18 Perform the final check for wiring conditions referring to NOTE: the drawing below. Check that all wires do not contact with the compressor, piping or plate edges. If it contacts, wire breakage or fire may be occurred. Tack Remove Td thermistor and PSH from dent part of waterproof cover right side.

  • Page 231: Replacing Return Oil Circuit (Strainer)

    Servicing Service Manual 9.1.6. Replacing return oil circuit (Strainer) Turn OFF all power source switches before starting. cycle through refrigerant collecting system. (Both 1 Remove the front service panel according to the item high and low pressure sides) “Removing Front Service Panel”. b Remove the flare nut connecting return oil circuit 2 Collect all remaining refrigerant in the refrigerant cycle with the oil separator outlet port.
  • Page 232 Servicing Service Manual RAS-14FSN2 to RAS-24FSN2 (A) Flare Nut at Upper Part of Return Oil Circuit Oil Separator (B) Flare Nut for Oil Separator Outlet Port Return Oil Circuit RAS-26FSN2 to RAS-42FSN2 (figure for RAS-42FSN2) (A) Flare Nut at Upper Part of Return Oil Circuit Oil Separator (B) Flare Nut for Oil Separator Outlet Port Return Oil Circuit...

  • Page 233: Removing High Pressure Switch, High Pressure Sensor And Low Pressure Sensor

    Servicing Service Manual 9.1.7. Removing high pressure switch, high pressure sensor and low pressure sensor 1 Remove the front service panel according to Item “Removing front service panel”. 2 High pressure switch / pressure sensor fixing position. High pressure switch, high pressure sensor and low pressure sensor are fixed as shown in the figure. RAS-8FSN2 to RAS-12FSN2 High pressure switch (PSH1)
  • Page 234 Servicing Service Manual RAS-26FSN2 to RAS-42FSN2 (figure for RAS-42.FSN2) High pressure compressor (PSH4) High pressure High pressure High pressure compressor compressor (PSH5) compressor (PSH3) (PSH2) High pressure compressor (PSH1) High pressure sensor (Pd) Constant speed compressor (MC5) Constant speed compressor (MC4) Constant speed compressor (MC3) Constant speed...
  • Page 235 Servicing Service Manual Removing high pressure switch 1 Collect the refrigerant. 2 Disconnect the faston terminals. Faston terminal 3 Remove the high pressure switch from the brazing part of the discharge pipe by use of a burner. High pressure switch NOTES: –...

  • Page 236: Removing Reversing Valve And Removing Reversing Valve Coil

    Servicing Service Manual 9.1.8. Removing reversing valve and removing reversing valve coil 1 Remove the front service panel according to the item “Removing Front Service Panel”. 2 The reversing valve fixing position is as shown in the figure. RAS-8FSN2 to RAS-12FSN2 RAS-14FSN2 to RAS-24FSN2 (figure for RAS-12FSN2) (figure for RAS-24FSN2)
  • Page 237 Servicing Service Manual RAS-8FSN2 to RAS-12FSN2 Removing reversing valve 1 Before starting this work, collect the refrigerant into a cylinder from the refrigerant cycle, and turn OFF the power source of the unit. 2 Remove the four (4) screws fixing the electrical control box cover.
  • Page 238 Servicing Service Manual 6 Remove the reversing valve assembly. NOTE: Remove the brazing as shown in the figure by covering When removing brazing, cover the reversing valve with the reversing valve with wet cloth for cooling. wet cloth for cooling. Remove the brazing in the following order: a Brazing at right and left branch pipes of three pipes from the reversing valve.

  • Page 239: Removing Solenoid Valve And Solenoid Valve Coil

    Servicing Service Manual 9.1.9. Removing solenoid valve and solenoid valve coil Remove the front service panel according to the item “Removing Front Service Panel”. RAS-8FSN2 to RAS-12FSN2 Removing Solenoid Valve 1 Collect the refrigerant from the check joint. 2 Remove the solenoid valve coils according to the item “Removing Solenoid Valve Coil”.
  • Page 240 Servicing Service Manual RAS-14FSN2 to RAS-24FSN2 (figure for RAS-24FSN2 Solenoid Valve SVA3 (Only for RAS-18FSN2 to RAS-24FSN2) Solenoid Valve Solenoid Valve Solenoid Valve SVA2 Solenoid Valve Solenoid Valve SVA1 Detailed figures Brazing Removing Portion Brazing Removing Portion SVA1 Brazing Removing Portion (Clogging may occur) SVA3...
  • Page 241 Servicing Service Manual RAS-26FSN2 to RAS-42FSN2 (figure for RAS-42FSN2) Solenoid Valve Solenoid Valve SVA5 SVA4 Solenoid Valve Solenoid Valve SVA3 SVA2 Solenoid Valve Solenoid Valve Solenoid Valve Solenoid Valve SVA1 Detailed figures Brazing Removing Portion Brazing Removing Portion SVA1 Brazing Removing Portion Brazing Removing Portion SVA4...
  • Page 242 Servicing Service Manual RAS-44FSN2 to RAS-48FSN2 Solenoid Valve Solenoid Valve SVA4 Solenoid Valve Solenoid Valve SVA5 SVA3 SVA2 Solenoid Valve Solenoid Valve Solenoid Valve Solenoid Valve SVA1 Detailed figures Brazing Removing Portion Brazing Removing Portion SVA1 Brazing Removing Portion Brazing Removing Portion SVA5 Brazing Removing Portion SVA4...

  • Page 243: Replacing Oil Separator, Liquid Tank And Accumulator

    Servicing Service Manual Removing solenoid valve coil 1 Remove one (1) screw fixing the solenoid valve coil. If Screw Solenoid valve coil the portion is difficult to remove brazing with a Phillips screwdriver, use a spanner or an adjustable wrench. –...
  • Page 244 Servicing Service Manual RAS-8FSN2 to RAS-12FSN2 Removing oil separator 1 Loosen two (2) screws at the oil separator rear side through the space between oil separator and Oil Separator accumulator with a Phillips screwdriver. The back side of the oil separator bottom plate are U-shaped dent structure.
  • Page 245 Servicing Service Manual RAS-8FSN2 to RAS-12FSN2 Removing liquid tank 1 Loosen two (2) screws at the liquid tank rear side from the liquid tank right side with a Phillips screwdriver. The back side of the liquid tank bottom plate are Liquid Tank U-shaped dent structure.
  • Page 246 Servicing Service Manual RAS-8FSN2 to RAS-12FSN2 Removing accumulator 1 Remove four (4) screws fixing the accumulator. 2 Hoist up the accumulator vertically from the outdoor unit Accumulator by use of crane and so on. RAS-14FSN2 to RAS-28FSN2 Accumulator RAS-30FSN2 to RAS-48FSN2 (figure for RAS-48-FSN2) Accumulator SMGB0049 rev.0 - 02/2009...

  • Page 247: Removing Stop Valve

    Servicing Service Manual 9.1.11. Removing stop valve Before starting this work, collect the refrigerant into a cylinder from the refrigerant cycle, and turn OFF the power source of the unit. 1 Remove the front service panel according to the item 3 Remove the screws fixing the plate as shown in the “Removing Front Service Panel”.
  • Page 248 Servicing Service Manual RAS-14FSN2 to RAS-24FSN2 Brazing removing portion [ After removing stop valve ] Stop valve (Liquid side) Stop valve (Gas side) Plate Plate Remove screws Perform the brazing work while Fixing screw Fixing screw covering the stop valve with wet for Liquid Side for Gas side cloth for cooling.

  • Page 249: Removing Expansion Valve Coil

    Servicing Service Manual 9.1.12. Removing expansion valve coil 1 Remove the front service panel according to the item 3 For replacing the expansion valve coil, press the coil “Removing Front Service Panel”. into the expansion valve slot with turning the coil. If an excessive force is applied to the coil, the coil bracket 2 Turn the expansion valve coil in counterclockwise may be deformed.
  • Page 250 Servicing Service Manual RAS-8FSN2 to RAS-12FSN2 RAS-14FSN2 to RAS-24FSN2 (figure for RAS-24-FSN2) RAS-26FSN2 to RAS-42FSN2 (figure for RAS-42-FSN2) RAS-44FSN2 to RAS-48FSN2 (figure for RAS-48-FSN2) Expansion valve position SMGB0049 rev.0 - 02/2009 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

  • Page 251: Removing Thermistor Forliquid Pipe

    Servicing Service Manual 9.1.13. Removing thermistor forliquid pipe 1 Remove the front service panel according to the item “Removing Front Service Panel”. NOTE: When removing the thermistor for the liquid pipe, pay 2 Remove each two (2) screws fixing the electrical control attention not to be caught hands or thermistor on the box cover, and remove the electrical control box cover.
  • Page 252 Servicing Service Manual RAS-8FSN2 to RAS-12FSN2 RAS-14FSN2 to RAS-24FSN2 Electrical Control Box Electrical Control Box Auxiliary Electrical for Transmission Control Box THM23 THM17 THM10 THM17 Tchg THM11 THM23 THM11 Tchg RAS-26FSN2 to RAS-42FSN2 Electrical Auxiliary Electrical Control Box for Control Box Transmission THM10 THM17...

  • Page 253: Removing Thermistor For Ambient Temperature

    Servicing Service Manual 9.1.14. Removing thermistor for ambient temperature 1 Remove the front service panel according to the item “Removing Front Service Panel”. “Removing Air Intake Grille”. 2 Remove each four (4) screws fixing the electrical 5 Remove the fixing clamps for wiring. control box cover, and remove the electrical control box 6 Reassemble the thermistor for ambient temperature in cover.

  • Page 254: Removing Electrical Control Box

    Servicing Service Manual 9.1.15. Removing electrical control box 1 Remove the front service panel according to the item 4 Disconnect all of the connectors connected to the PCB1 “Removing Front Service Panel”. 5 Remove the screws fixing the compressor cable, the 2 Remove four (4) screws of each electrical control box power source cable and the transmission cables, and cover and remove the electrical control box cover.
  • Page 255 Servicing Service Manual 8 For attaching the electrical box, perform the reverse procedures for removing. NOTES: 1 Check to ensure that waterproof vinyl pipe edge and connectors are fixed firmly with cord clamp in the electrical box when wiring as shown in the figure below.

  • Page 256: Removing Other Electrical Components

    Servicing Service Manual 9.1.16. Removing other electrical components NOTES: Removing PCB1 1. Apply conductive silicon grease (Service Parts No.: 1 Remove all the connectors for wiring at PCB1. P22760) slightly over the contact surface with the fin 2 Hold the middle part of the holder fixing the PCB1 when replacing the components of the heat radiation (Part A in the figure, 10 portions) with a long-nose fin such as transistor module (IPM), diode module (DM)
  • Page 257 Servicing Service Manual RAS-8FSN2 to RAS-12FSN2 (380-415V/50Hz) Front side (Main) The interior of the electrical control box (Main) A Portion Middle part of holder PCB Fixing Holder: 10 RAS-8FSN2 to RAS-12FSN2 (220V/60Hz) Front side (Main) The interior of the electrical control box (Main) PCB1: Control PCB in outdoor unit PCB2:...
  • Page 258 Servicing Service Manual RAS-14FSN2 to RAS-24FSN2 (380-415V/50Hz) Front side (Main) The interior of the electrical control box (Main) A Portion Middle part of holder PCB Fixing Holder: 10 RAS-18-24FSN2 only Front side (Auxiliary) RAS-18-24FSN2 only RAS-14FSN2 to RAS-24FSN2 (220V/60Hz) The interior of the electrical control box (Main) Front side (Main) Front side (Auxiliary) PCB1:...
  • Page 259 Servicing Service Manual RAS-26FSN2 to RAS-42FSN2 (380-415V/50Hz, 380V/60Hz) Front side (Main) The interior of the electrical control box (Main) A Portion Middle part of holder PCB Fixing Holder: 10 Front side (Auxiliary) RAS-26FSN2 to RAS-42FSN2 (220V/60Hz) Front side (Main) The interior of the electrical control box (Main) Front side (Auxiliary) PCB1: Control PCB in outdoor unit...
  • Page 260 Servicing Service Manual RAS-44FSN2 to RAS-48FSN2 (380-415V/50Hz, 380V/60Hz) Front side (Main) The interior of the electrical control box (Main) A Portion Middle part of holder PCB Fixing Holder: 10 Front side (Auxiliary) RAS-44FSN2 to RAS-48FSN2 (220V/60Hz) Front side (Main) The interior of the electrical control box (Main) Front side (Auxiliary) PCB1: Control PCB in outdoor unit...
  • Page 261 Servicing Service Manual Removing PCB2 for inverter After removing three (3) M3 screws, remove the bushes and collars from PCB2. When reassembling, the bushes and collars should be fixed correctly. NOTES: WARNING: 1 Do not touch any electrical components during Do not touch any electrical part while LED 201 (Red) LED201 (red) of PCB2 is ON.
  • Page 262 Servicing Service Manual Removing diode module and transistor module NOTES: Before this work, remove the service panel according to 1 When mounting PCB2, marks on the PCB2 look the item “Removing Front Service Panel”. upside down but this is the correct position. 2 Identify the terminal Nos.
  • Page 263 Servicing Service Manual Removing fan module NOTE: Before this work, remove the service panel according to 1. Do not apply great force when removing the fan the item “Removing Front Service Panel”. module, or the brazing will be fallen apart and a Check to ensure that LED201 (Red) of the PCB3 is off.
  • Page 264 https://splitsystema48.ru/instrukcii-po-ekspluatacii-kondicionerov.html...

  • Page 265: Main Parts

    Main parts Service Manual Main parts Contents 10. Main parts _______________________________________________________________ 251 10.1. Inverter ________________________________________________________________ 252 10.1.1. Specifications of inverter _______________________________________________________ 252 10.1.2. Inverter time chart ____________________________________________________________ 254 10.1.3. Protective Function ____________________________________________________________ 255 10.1.4. Overload Control _____________________________________________________________ 256 10.2. Thermistor _____________________________________________________________ 257 10.2.1.

  • Page 266: Inverter

    Main parts Service Manual 10.1. Inverter 10.1.1. S pecifications of inverter Aplicable model RAS-8~48FSN2 Aplicable power source 3 Phase. 380V, 415V 50 Hz Output voltage 380-415V Output current Time rating Continuous Control method Vector PWM Control Range Output Frequency 20~115Hz Accuracy of Frequency 0,01 Hz at applicable frequency range Accuracy of output voltage ±10% at applicable frequency range...
  • Page 267 Main parts Service Manual Protection Function Overcurrent Protection for Inverter Detecting current is more than 150% of the rated current. Rated Current x 150% Rated Current x 105% Time *) Internal protection Transistor module or IPM (1) Short-Circuit Trip of Arm *) (2) Instantaneous Overcurrent Trip *) (3) Instantaneous Overcurrent Trip (4) Electronic Thermal Trip...

  • Page 268: Inverter Time Chart

    Main parts Service Manual 10.1.2. Inverter time chart Main Circuit Power Source Frequency Frequency All bit 1 All bit 1 Operation HIGH Frequency Instruction Output Voltage Soft Start-Stop (Frequency) The changing speed dependes on the outer setting Failure Signal Output Activation of Protection Device Transmit error...

  • Page 269: Protective Function

    Main parts Service Manual 10.1.3. Protective Function 1. Excessive High or Low Voltage for Inverter a) Level of Detection - When the voltage of direct current is greater than 750 V, abnormalities are detected. - When the voltage of direct current is smaller than 350 V, abnormalities are detected. b) Function When abnormalities are detected, the inverter compressor is stopped and transmit the signal code of stoppage cause to PCB1.

  • Page 270: Overload Control

    Main parts Service Manual When the temperature of internal thermistor exceeds more than 100 ºC, an abnormality is detected. b) Function When abnormalities are detected, the inverter compressor is stopped and the signal code of stoppage cause is transmitted to PCB1. c) Cancellation of Protection Function Transmission for signal code of stoppage cause is canceled when a stopping order is issued or main power source is cut off.

  • Page 271: Thermistor

    Main parts Service Manual 10.2. Thermistor 10.2.1. Position of thermistor (Example: RAS-30FSN2) Thermistor for outdoor ambient temperature Heat exchanger Thermistor holder Heat exchanger liquid Thermistor pipe fixing plate Auxiliary electrical Electrical box Thermistor for discharge gas temperature THM10, 11, 15, 16 (Te) Thermistor for evaporating temperature THM17 (Tchg)
  • Page 272 Main parts Service Manual exceeds 132°C for 10 minutes, the compressor will stop. Even if an electronic expansion valve opens in that situation, the compressor will also stop. This way, the compressor is protected. Resistance values of the thermistor are shown in the figure. d.
  • Page 273 Main parts Service Manual Thermistor for the defrost operation (THM10, THM11 and THM15) The resistance values of this thermistor are the same as the resistance values of the thermistor for the outdoor ambient temperature. Thermistor for the room temperature control (thermistor for the inlet air temperature of the indoor unit, THM1) The thermistor for the inlet air temperature (THM1) controls the room temperature.

  • Page 274: Electronic Expansion Valve

    Main parts Service Manual 10.3. Electronic expansion valve 10.3.1. Electronic expansion valve for the outdoor unit Micro-computer Pulse motor Pulse signal 2-Phase permanent magnetic pulse motor Control 0 to 500 pulse by 1 pulse Refrigerant flow control Needle Precise control Items Specifications Applicable to the models...

  • Page 275: Pressure Sensor

    Main parts Service Manual 10.4. Pressure sensor High-pressure control Low-pressure control A high-pressure sensor detects the high pressure during A low-pressure sensor detects the suction pressure during the heating process. The PID control with the operation the cooling process. The PID control with the operation capacity of the indoor units controls the compressor capacity of the indoor units controls the compressor frequencies.

  • Page 276: Scroll Compressor

    Main parts Service Manual 10.5. Scroll compressor 10.5.1. Reliable mechanism for low vibrating and low sound 1. The rotating direction is definite. 2. The pressure inside of the chamber is high pressure, and the surface temperature of the chamber is 60 °C to 110 °C.

  • Page 277: Field Work Instruction

    Field work instruction Service Manual Field work instruction Contents 11. Field work instruction_______________________________________________________ 263 11.1. Checking the power source and the wiring connection ___________________________ 264 11.2. Burnt-out compressor due to an insufficient refrigerant charge _____________________ 264 11.3. Insufficient cooling performance when a long piping is applied _____________________ 265 11.4.

  • Page 278: Checking The Power Source And The Wiring Connection

    Field work instruction Service Manual 11.1. Checking the power source and the wiring connection Check the following items in the case of abnormal operation: Check item Procedure Is the breaker of the Check the secondary voltage of the breaker and the fuse by means of a tester. fuse cut out? Is the secondary Disconnect the secondary side of the transformer and check the voltage by means of a tester.

  • Page 279: Insufficient Cooling Performance When A Long Piping Is Applied

    Field work instruction Service Manual 11.3. Insufficient cooling performance when a long piping is applied Question and answer for the field work Example 2: Insufficient cooling performance when a long piping is applied Phenomenon Sufficient cooling was not available for an indoor unit that was located at the farthest position. Cause If the location of an outdoor unit is 20 meters lower than the location of the indoor units, resetting of the DIP switch DSW3 is required.

  • Page 280: Not Cooling Well Due To Insufficient Installation Space For The Outdoor Unit

    Field work instruction Service Manual 11.5. Not cooling well due to insufficient installation space for the outdoor unit Question and answer for the field work Example 5: Not Cooling Well due to Insufficient Installation Space for Outdoor Unit Phenomenon Cooling operation was well performed through the intermediate season. However, the cooling operation was not well available when the outdoor temperature was higher than 35°C.

  • Page 281: Caution With The Refrigerant Leakage

    Field work instruction Service Manual 11.6. Caution with the refrigerant leakage The designers and the installers have the responsibility to follow the local codes and the local regulations that specify the safety requirements against the refrigerant leakage. 11.6.1. Maximum permissible concentration of the HFC Gas The refrigerant R410A, which is charged in the SET-FREE FSN2 system, is an incombustible non-toxic gas.
  • Page 282 Field work instruction Service Manual Example Room R (kg) V (m³) C (kg/m³) Countermeasure System A Outdoor unit System B Outdoor unit 0.17 System A System B Refrigerant: 60 kg Refrigerant: 50 kg 1000 0.11 0.34 0.06 m³ Opening 0.34 0.06 m³...

  • Page 283: Maintenance Work

    Field work instruction Service Manual 11.7. Maintenance work For the indoor unit and the outdoor unit 1. Fan and fan motor – Lubrication: All the fan motors are prelubricated and sealed at the factory. Therefore, no lubrication maintenance is required. – Sound and vibration: Check for abnormal sounds and vibrations.

  • Page 284: Pump-Down Method For Replacing The Compressor

    Field work instruction Service Manual 11.7.1. Pump-down method for replacing the compressor Procedure Remarks Turn off the main switch of the outdoor unit. Remove the covers, the thermistor, the crankcase Make sure that the terminal part of the detached power heater, the power wirings, and other items according supply wires is not exposed by the winding insulation tape to the chapter "Removing the Parts of the Oudoor...
  • Page 285 Field work instruction Service Manual Procedure Remarks Check for a leakage of the check valve on the – When you stop the compressor for replacing: discharge gas side: – You can check the leakage of the check valve – DSW4-4 (Enforced stoppage of the compressor) by means of the Ps variation because the SVA opens so →...
  • Page 286 Shimizu-shi, Shizuoka-ken, Japan ISO 9001 Certified by JQA, Japan ISO 14001 Certified by JQA, Japan Hitachi Air Conditioning Products (M) Sdn. Bnd. Lot No. 10, Jalan Kemajan Bangi Industrial Estate 43650 Bandar Baru Bangi, Selangor Darul Ehsan, Malaysia Certification ISO 9001, Malaysia Certification ISO 14001, Malaysia SMGB0049 rev.0 - 04/2009 - Printed in Spain...

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