Hitachi FSG Series Service Manual
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Hitachi FSG Series Service Manual

Hitachi FSG Series Service Manual

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"SET-FREE"
FSG/FS3

Service Manual

Outdoor Units: 5 ~ 20 HP
Indoor Units Type:
• In-the-Ceiling
• 4-Way Cassette
• 2-Way Cassette
• Wall
• Floor
• Floor Concealed
• Ceiling
• Total Heat Exchangers

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Summary of Contents for Hitachi FSG Series

  • Page 1: Service Manual

    "SET-FREE" FSG/FS3 Service Manual Outdoor Units: 5 ~ 20 HP Indoor Units Type: • In-the-Ceiling • 4-Way Cassette • 2-Way Cassette • Wall • Floor • Floor Concealed • Ceiling • Total Heat Exchangers...
  • Page 3 HITACHI may bring the latest innovations to their customers Whilst every effort is made to ensure that all dimensions and specifications are correct, any printers' errors not rectified are outside the control of HITACHI, who cannot be held responsible for same...

  • Page 5: Table Of Contents

    CONTENTS CONTENTS 1. TROUBLESHOOTING 1.1. INITIAL TROUBLESHOOTING......................1-1 1.1.1. ROTARY SWITCH AND DIP SWITCH SETTING ................1-1 1.1.2. CHECKING OF ELECTRICAL WIRING ..................1-5 1.1.3. CHECKING BY 7-SEGMENT DISPLAY..................1-6 1.1.4. EMERGENCY OPERATION WHEN INVERTER COMPRESSOR IS DAMAGED ......1-7 1.1.5.
  • Page 6 CONTENTS 2.3. 4-WAY CASSETTE TYPE ........................2-15 2.3.1. REMOVING LONG LIFE FILTER ....................2-15 2.3.2. REMOVING INTAKE AIR GRILLE ....................2-15 2.3.3. REMOVING ELECTRICAL BOX COVER ..................2-15 2.3.4. REMOVING OPTIONAL AIR PANEL....................2-15 2.3.5. REMOVING TURBO FAN AND FAN MOTOR................2-16 2.3.6. REMOVING PRINTED CIRCUIT BOARD (PCB) ................2-17 2.3.7.
  • Page 7 CONTENTS 2.9. TOTAL HEAT EXCHANGER ....................... 2-45 2.9.1. REMOVING AIR FILTER ......................2-45 2.9.2. REMOVING TOTAL HEAT EXCHANGING ROTOR..............2-46 2.9.3. REMOVING AIR SUPPLY FAN ASSEMBLY AND EXHAUST FAN ASSEMBLY......2-46 2.10. CLEANING INDOOR UNIT HEAT EXCHANGER................2-47 2.10.1. REQUIRED TOOLS FOR CLEANING (FOR ALL INDOOR UNITS) ..........2-47 2.10.2.
  • Page 8 CONTENTS 4.2. OUTDOOR UNIT............................ 4-6 4.2.1. DEMAND ............................4-7 4.2.2. FORCED STOPPAGE ........................4-7 4.2.3. FIXING OPERATION MODE ......................4-8 4.2.4. SNOW SENSOR..........................4-8 4.2.5. DEFROSTING CONDITION CHANGEOVER ................4-9 4.2.6. INDOOR FAN CONTROL DURING THERMO-OFF AT HEATING..........4-9 4.2.7. ALL SEASON HEATING OPERATION..................

  • Page 9: Troubleshooting

    TROUBLESHOOTING 1 TROUBLESHOOTING INITIAL TROUBLESHOOTING 1.1.1 ROTARY SWITCH AND DIP SWITCH b. Optional Function Setting (DSW2) SETTING Note: The “n” mark indicates position of dip switches. n INDOOR UNIT Figures show the setting before shipment. The PCB in the indoor unit is equipped with 7 types of dip switches and rotary switch.
  • Page 10 TROUBLESHOOTING n OUTDOOR UNIT e. Refrigerant Cycle No. Setting (DSW5) Setting is required. Setting position before shipment is all TURN OFF all power sources before setting. Without turning OFF. OFF, the switches do not work and the contents of the setting are invalid.
  • Page 11 TROUBLESHOOTING n DSW1: Refrigerant cycle no. setting n DSW4: Test Operation & Service Settings Setting is required if H-Link is used. Setting position before Setting is required. This dip switch is utilized for test shipment are all OFF (Refrigerant cycle No. 0). In the same operation or when servicing operation is performed.
  • Page 12 TROUBLESHOOTING n DSW10: Transmitting Setting n DSW7: Compressor Emergency Operation Setting is required for cancellation of end resistance and Setting is not required. All compressor are running except when fuse is melted. compressor selected Œ Before shipment, No. 1 pin of DSW10 is Œ...

  • Page 13: Checking Of Electrical Wiring

    TROUBLESHOOTING 1.1.2 CHECKING OF ELECTRICAL WIRING n Check to ensure that the terminal for power source wiring Electrical Data and Recommended Wiring, Breaker Size/1 Outdoor Unit (terminals ”L1” to ”L1” and ”N” to ”N” of each terminal board: AC380-415V, terminals “R” to “R” and “T” to “T” of 3RZHU )XVH 5XQQLQJ...

  • Page 14: Checking By 7-Segment Display

    TROUBLESHOOTING 1.1.3 CHECKING BY 7-SEGMENT DISPLAY n Simple checking by 7-Segment Display vTurn on All Indoor Units v All the Indoor Units Connected to the Outdoor Unit Turn on the Outdoor Unit Turn Auto-addressing starts During auto-addressing, the following items can be checked using the outdoor unit’s on-board 7-segment LED display.

  • Page 15: Emergency Operation When Inverter Compressor Is Damaged

    TROUBLESHOOTING 1.1.4 EMERGENCY OPERATION WHEN INVERTER COMPRESSOR IS DAMAGED n Failure of Inverter Compressor a. Contents of Operation (Applied Models: RAS-8FS3(G), d. Emergency Operation 10FS3(G), 16FS3(G), 20FS3(G)) 1. Turn OFF all the power source switches. 1. This operation is an emergency operation by a 2.

  • Page 16: Failure Of Power Supply To Indoor Unit And Remote Control Switch

    TROUBLESHOOTING 1.1.5 FAILURE OF POWER SUPPLY TO INDOOR UNIT AND REMOTE CONTROL SWITCH n Lights and LCD are not Indicated. n Not Operated If fuses are melted or a breaker is activated, investigate the cause of over current and take necessary action. Action Phenomenon Cause...

  • Page 17: Abnormal Transmission Between Remote Control Switch And Indoor Unit

    TROUBLESHOOTING 1.1.6 ABNORMAL TRANSMISSION BETWEEN REMOTE CONTROL SWITCH AND INDOOR UNIT n ”RUN” Lamp on Remote Control Switch: Flickering every 2 seconds Action Phenomenon Cause Check Item (Turn OFF main switch) Disconnection or insufficient Contacting of Remote Check cable and Repair cable or connect it Control Cable connections...

  • Page 18: Abnormalities Of Devices

    TROUBLESHOOTING 1.1.7 ABNORMALITIES OF DEVICES Action Phenomenon Cause Check Item (Turn OFF main switch) Measure coil resistance by Disconnected Coil tester Failure of Replace Indoor unit fan Indoor Unit motor Fan Motor Measure insulation Burnt-Out Coil resistance Measure coil resistance by Disconnected Coil tester...
  • Page 19 TROUBLESHOOTING 1.1.7 ABNORMALITIES OF DEVICES (Cont.) Action Phenomenon Cause Check Item (Turn OFF main switch) Check Setting Condition of "Remote Control Thermostat" by Optional Setting Setting and Control: "00": Control by Indoor Thermistor for The Comp. Suction Air does not Stop In case that thermostat of "01": Control by or Start even if...
  • Page 20 TROUBLESHOOTING 1.1.7 ABNORMALITIES OF DEVICES (Cont.) Action Phenomenon Cause Check Item (Turn OFF main switch) Failure of Failure of Thermistor Replace or correctly Discharge Check Thermistor by self- connect wiring when it is Air Temp. checking *2) Disconnected abnormal Thermistor Wire of Indoor Fan Thermistor...
  • Page 21 TROUBLESHOOTING 1.1.7 ABNORMALITIES OF DEVICES (Cont.) Action Phenomenon Cause Check Item (Turn OFF main switch) Indoor Cool Load is Greater Calculate Cool load. Use a bigger unit. than Cooling Capacity Correctly charge Gas Leakage Measure Superheat. refrigerant after repairing or Shortage of Refrigerant gas leakage.
  • Page 22 TROUBLESHOOTING 1.1.7 ABNORMALITIES OF DEVICES (Cont.) Action Phenomenon Cause Check Item (Turn OFF main switch) Clogging of Outdoor Unit Remove Clogging. Heat Exchanger? Obstacles at Inlet or outlet Insufficient of outdoor unit heat Remove obstacles. Air Flow to exchanger. Outdoor Unit Heat Is service space for Secure service space.
  • Page 23 TROUBLESHOOTING 1.1.7 ABNORMALITIES OF DEVICES (Cont.) Action Phenomenon Cause Check Item (Turn OFF main switch) Indoor Heat Load is Greater Replace the Unit with a Calculate Heat Load. than Heating Capacity Bigger Unit. Correctly Charge Leakage or Refrigerant after Gas Measure Superheat.
  • Page 24 TROUBLESHOOTING 1.1.7 ABNORMALITIES OF DEVICES (Cont.) Action Phenomenon Cause Check Item (Turn OFF main switch) Check for filter clogging. Remove clogging. Insufficient Air Flow to Check for any obstacles at Indoor Unit inlet or outlet of indoor Remove Obstacles. Heat unit.
  • Page 25 TROUBLESHOOTING 1.1.7 ABNORMALITIES OF DEVICES (Cont.) Action Phenomenon Cause Check Item (Turn OFF main switch) Foreign Particles Inside of Check it by viewing. Remove foreign Particles. Fan Casing Indoor Unit Fan Runner is Adjust position of fan Check it by viewing. Hitting Casing runner.

  • Page 26: Troubleshooting Procedure

    TROUBLESHOOTING TROUBLESHOOTING PROCEDURE 1.2.1 ALARM CODE TABLE Code No. Category Content of Abnormality Leading Cause Indoor Unit Tripping of Protection Device Failure of Fan Motor, Drain Discharge, PCB, Relay. Outdoor Unit Tripping of Protection Device Activation of PSH Abnormality between Indoor and Incorrect Wiring.

  • Page 27: Troubleshooting By Alarm Code

    TROUBLESHOOTING 1.2.2 TROUBLESHOOTING BY ALARM CODE Alarm Code Activation of Safety Device in Indoor Unit n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 28 Normal PCB1 Check activation of the following safety devices. Remove the cause after checking. € High Pressure Switch (PSH: 3.0MPa (30 kgf/cm²G) for FS3 Series / 3.3MPa (33 kgf/cm²G) for FSG Series) Check Item Power Suplly Connector for CMC1...
  • Page 29 TROUBLESHOOTING Action Phenomenon Cause Check Item (Turn OFF main switch) Clogging of Heat Remove clogging. Exchanger? Check for dust on air filter Remove dust. Insufficient Air Flow to Heat Exchanger (Outdoor Heat Check for any obstacles at Exchanger during Cooling inlet or outlet of outlet of Remove obstacles.
  • Page 30 TROUBLESHOOTING Action Phenomenon Cause Check Item (Turn OFF main switch) Check for clogging. Remove clogging. Check connecting wiring Replace connector. and connectors. Faulty or Malfunction of Check operating sound Replace coil. Expansion Valve from coil. Check discharge gas Replace thermistor. thermistor.
  • Page 31 TROUBLESHOOTING Alarm Code Abnormal Transmitting between Indoor Units and Outdoor Unit n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 32 TROUBLESHOOTING Is DSW10-1P (Terminal Resistance) Set it correctly. on PCB1 ON? Is the voltage between Check the fuses of Is LED1 (red) on faston terminal "R1" outdoor unit power PCB1 ON? and "N" of PCB1 220V supply. or 240V? Is connector (PCN1, Remove CN2 of Plug PCN1 and CN1 CN1) for transformer...
  • Page 33 TROUBLESHOOTING Action Phenomenon Cause Check Item (Turn OFF main switch) Power Failure or No Power Supply Measure voltage by tester. Supply power. Check for breakage of Remove short circuit and Short Circuit between Wires insulation. replace fuse. Short Circuited Wire to Measure insulation Remove short circuit to Ground...
  • Page 34 TROUBLESHOOTING Alarm Code Abnormal Transmitting between Inverter and Outdoor PCB1,3 n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 35 TROUBLESHOOTING Alarm Code Code Abnormality of Picking up Phase Signal n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 36 TROUBLESHOOTING Alarm Code Excessively Low or High Voltage for Inverter n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 37 TROUBLESHOOTING Alarm Code Decrease of Discharge Gas Superheat n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 38 TROUBLESHOOTING Action Phenomenon Cause Check Item (Turn OFF main switch) Ref. Cycle is Different from Check ref. cycle and Repair wiring. the Electrical System electrical system. Measure pressure. (Refer to Correctly charge Overcharged Refrigerant Figure in Test Run of TC.) refrigerant.
  • Page 39 TROUBLESHOOTING Alarm Code Excessively High Discharge Gas Temperature at the Top of Compressor Chamber n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 40 TROUBLESHOOTING Action (Turn OFF Main Phenomenon Cause Check Item Switch) Ref. Cycle is Different from Check ref. cycle and Repair wiring. the Electrical System electrical system. Correctly charge Shortage of Refrigerant Check pressures. refrigerant Faulty Ex. Valve Refer to 1.3.6. Replace ex.
  • Page 41 TROUBLESHOOTING Alarm Code Activation of Protection Device for Outdoor Fan Motor n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 42 TROUBLESHOOTING Alarm Code Abnormality of Thermistor for Indoor Unit Inlet Air Temperature (Air Inlet Thermistor) n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 43 TROUBLESHOOTING Alarm Code Abnormality of Thermistor for Indoor Discharge Air Temperature (Air Outlet Thermistor) n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 44 TROUBLESHOOTING Alarm Code Abnormality of Thermistor for Indoor Unit Heat Exchanger Liquid Refrigerant Pipe Temperature (Freeze Protection Thermistor) n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 45 TROUBLESHOOTING Alarm Code Abnormality of Thermistor for Indoor Unit Heat Exchanger Gas Refrigerant Pipe Temperature (Gas Piping Thermistor) n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 46 TROUBLESHOOTING Alarm Code Activation of Protection Device for Indoor Fan Motor (except RPK-Model) n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 47 TROUBLESHOOTING Alarm Code Activation of Protection Device for Indoor Fan Motor (RPK-Model) n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 48 TROUBLESHOOTING Alarm Code Abnormality of High Pressure Sensor for Outdoor Unit n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 49 TROUBLESHOOTING Alarm Code Abnormality of Thermistor for Outdoor Air Temperature (Outdoor Unit Ambient Thermistor) n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 50 TROUBLESHOOTING Alarm Code Abnormality of Thermistor for Discharge Gas Temperature on the Top of Compressor Chamber n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, or the unit No.
  • Page 51 TROUBLESHOOTING Alarm Code Abnormality of Thermistor for Evaporating Temperature during Heating Operation (Outdoor Unit) n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and or the unit No.
  • Page 52 TROUBLESHOOTING Alarm Code Abnormality of Low Pressure Sensor for Outdoor Unit n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 53 TROUBLESHOOTING Alarm Code Incorrect Capacity Setting or Combined Capacity between Indoor Units and Outdoor Unit n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 54 TROUBLESHOOTING Alarm Code Abnormality in Transmitting of Other Indoor Units n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 55 TROUBLESHOOTING Alarm Code Incorrect Indoor Unit No. Setting n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 56 TROUBLESHOOTING Alarm Code Abnormality of Running Current at Constant Compressor n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 57 TROUBLESHOOTING Action Phenomenon Cause Check Item (Turn OFF main switch) operate within Excessively High or Low 380-145V±10%(50Hz) Voltage of Power Source 380V±10%(60Hz) 220V±10%(60Hz) Excessively Large Running Imbalance Among Phase Adjust voltage between Current of Compressor Motor at Power Source each phase. Excessively High Check for causes.
  • Page 58 TROUBLESHOOTING Alarm Code Activation to Protect System from Low Compression Ratio n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 59 TROUBLESHOOTING Alarm Code Activation to Protect System from Excessively High Suction Pressure n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 60 TROUBLESHOOTING Alarm Code Activation to Protect System from Excessively High Discharge Pressure n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 61 TROUBLESHOOTING Alarm Code Activation to Protect System from Excessively Low Discharge Pressure (for Protection of Refrigerant Shortage) n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 62 TROUBLESHOOTING Alarm Code Activation to Protect System from Excessively Low Suction Pressure (Protection from Vacuum Operation) n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 63 TROUBLESHOOTING Alarm Code Abnormality of Current Transformer (0A Detection) n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 64 TROUBLESHOOTING Alarm Code Protection Activation Against Instantaneous Overcurrent of Inverter (1) n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 65 TROUBLESHOOTING Alarm Code Protection Activation Against Instantaneous Overcurrent of Inverter (2) n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 66 TROUBLESHOOTING Alarm Code Protection Activation of Transistor Module n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 67 TROUBLESHOOTING Alarm Code Abnormality of AC Chopper Circuit Board n ”RUN” light flickers and ”ALARM” is indicated on the remote control switch. n The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit No.
  • Page 68 TROUBLESHOOTING Alarm Code Incorrect Wiring Among Indoor Units ‘ This alarm code is indicated only when remote control switch PC-2H2 is used being connected to indoor unit. ‘ This alarm occurs in the case of incorrect connection like that TL terminal is connected to Vc terminal as below when indoor units are wired.
  • Page 69 TROUBLESHOOTING Alarm Code Compressor Protection ‘ This alarm code appears when one of the following alarms occurs three times within 6 hours, which may result in serious compressor damages, if the outdoor unit is continuously operated without removing the cause. Alarm Code: Content of Abnormality Tripping of Protection Device in Outdoor Unit...

  • Page 70: Troubleshooting In Check Mode By Remote Control Switch

    TROUBLESHOOTING 1.2.3 TROUBLESHOOTING IN CHECK MODE BY REMOTE CONTROL SWITCH n Use the remote control CHECK switch in the following cases. 1. When the RUN lamp is flashing 2. To trace back the cause of trouble after restarting from stoppage with the RUN lamp flashing 3.
  • Page 71 TROUBLESHOOTING n CONTENTS OF CHECK MODE 1 The next indication is shown by pressing the part } of "TEMP" switch. If the part ~ of "TEMP" switch is pressed, the previous indication is shown. 7HPSHUDWXUH LQGLFDWLRQ Indication of Category Code Indication of Temperature, etc b1 22 Indoor Unit Temp.
  • Page 72 TROUBLESHOOTING Heating Thermo-ON Alarm Thermo Temp. of bb 23 Operation Remote Control Coding Thermo-ON Switch ” shown ,QGLFDWLRQ RQ 0LFUR&RPSXWHU ,QSXW 2XWSXW Y52H Micro Computer Input/Output in Indoor Unit Y211 Y52C1 ” Y52C2 Y20B Symbols with a letter Y Micro Computer Input/Output in are relays on PCB Y20A...
  • Page 73 TROUBLESHOOTING &RPSUHVVRU 3UHVVXUH)UHTXHQF\ ,QGLFDWLRQ Discharge Pressure HI 18 (High) (X 0.1 MPa) ” H2 04 Suction Pressure (Low) (X 0.01 MPa) ” This is an indication for internal information for the remote H3 44 Control Information control switch. This does not have any specific meaning. ”...
  • Page 74 TROUBLESHOOTING n CONTENTS OF CHECK MODE 2 The latest data of the first three indoor units only connected serially are indicated when more than three indoor units are connected to one remote control switch. By pressing the } part of "TEMP" switch, the next display is indicated.
  • Page 75 TROUBLESHOOTING &RPSUHVVRU 3UHVVXUH)UHTXHQF\ ,QGLFDWLRQ 99 18 Discharge Pressure (High) (X 0.1 MPa) ” 9A 04 Suction Pressure (Low) (X 0.01 MPa) ” 9b 44 This is an indication for internal information for the remote control Control Information switch. This does not have any specific meaning. ”...
  • Page 76 TROUBLESHOOTING 1.2.4 TROUBLESHOTING BY 7-SEGMENT DISPLAY n CHECKING METHOD BY 7-SEGMENT DISPLAY By using the 7-segments and check switch (PSW) on the PCB1 in the Outdoor Unit, total quantity of combined Indoor Units, 7- segments operation conditions and each part of refrigerant cycle can be checked. n To start checking, press the "PSW2"...
  • Page 77 TROUBLESHOOTING from Previous Page ” Checking item PSW3 PSW2 Checking contents Air flow ratio PSW2 PSW3 PSW3 PSW2 o E 1 Outdoor Expansion Valve MV1 Opening PSW2 PSW3 PSW3 PSW2 o E 2 Outdoor Expansion 1 0 0 Valve MV2 Opening PSW2 PSW3 PSW3...
  • Page 78 TROUBLESHOOTING from Previous Page ” Checking item PSW3 PSW2 Indicates running current of primary side of inverter Estimated Running Current of Compressor PSW2 PSW3 PSW3 PSW2 Estimated Running Current of Compressor PSW2 PSW3 (For 8, 10, 16, 20HP) PSW3 PSW2 Estimated Running Current of Compressor PSW2...
  • Page 79 TROUBLESHOOTING from Previous Page ” Checking item PSW3 PSW2 ó o 0 (No, 0 Unit) (No. 0 Unit) PSW2 PSW3 (°C) Indoor Unit Discharge Air Temperature. PSW3 PSW2 ó o F (No. F Unit) (No. F Unit) PSW2 PSW3 (°C) (Indicates only the units number connected) PSW3 PSW2...
  • Page 80 TROUBLESHOOTING from Previous Page ” Checking item PSW3 PSW2 Displayed in 4 digit number U J 2 Total Accumulated hours 9999 2 1 9 of Compressor MC2 PSW2 PSW3 (x 10 times hours) (For 8, 10, 16, 20HP) PSW3 PSW2 Displayed in 4 digit number U J 3 Total Accumulated hours...
  • Page 81 TROUBLESHOOTING n RUNNING CURRENT OF COMPRESSOR n Inverter Primary Current The inverter primary current is estimated from the running current of the compressor MC1 indicated on 7-segments, as the right chart shows. n Indicated Running Current of Compressor MC2, MC3, MC4 The running current of the compressor MC2, MC3, MC4, is detected by current sensor.
  • Page 82 TROUBLESHOOTING n Protection Control Code on 7-Segment Display n Higher priority is given to protection control related to 1. The protection control indication can be seen on 7-segments when a protection control is activated. frequency control than the other. 2. The 7segment continues ON while function is working, <Priority Order>...
  • Page 83 TROUBLESHOOTING n ACTIVATING CONDITION OF PROTECTION CONTROL CODE For following the conditions as the temperature change, The activating conditions of protection control are shown in etc., the control of frequency, etc. is performed to prevent the table below the abnormal conditions by the protection control. Code Protection Control Activating Condition...

  • Page 84: Function Of Rsw, Dsw And Leds

    TROUBLESHOOTING 1.2.5 FUNCTION OF RSW, DSW AND LEDS n Printed Circuit Board in Indoor Unit. n Dip Switch and LED Functions on Indoor Unit Printed Circuit Board Part Name Contents of Functions ® Setting of Indoor Unit Number ¯ Setting of Optional Functions DSW2 A.
  • Page 85 TROUBLESHOOTING n Printed Circuit Board in Outdoor Unit Œ Arrangement Inside of Main Electrical Box RAS-5FSG, RAS-5FS3 Before Manufacturing # U4MV0196 The Interior of the Front Side Electrical Control Box After Manufacturing # U4MV0197 The Interior of the Electrical Control Box Front Side RAS-8~20FSG, RAS-8~20FS3 Before Manufacturing # U4NG1001...
  • Page 86 TROUBLESHOOTING Œ Purpose Symbol Purpose 1. Transmitting between Indoor Unit and Outdoor Unit 2. Processing for Sensor Input 3. Processing for Dip Switch Input 4. Operation Control for Above items 1 to 3. Compressor Operation Control, Bypass Valve Control, Fan Control and Overcurrent Control PCB1 for Control 5.
  • Page 87 TROUBLESHOOTING n Dip Switches and LED Functions on Outdoor Unit Printed Circuit Boards Name of Internal Part Name Contents of Functions Circuit Board ® Setting of Outdoor Unit Number DSW1 ¯ Setting of Capacity Code DSW2 Outdoor unit capacity is set according to nominal capacity (HP). °...
  • Page 88 TROUBLESHOOTING b. Inverter Printed Circuit Board: PCB3 *Dip Switch and LED Functions on Outdoor Unit Inverter Printed Circuit Board Switch Name Function DSW1 Normal: No.1 and No.2 of DSW1 are OFF. Emergency Operation or Troubleshooting: No.1 of DSW1 is ON No.2 of DSW1 is OFF The above setting aims not to trip even if the CT detects 0A.
  • Page 89 TROUBLESHOOTING c. ”SNUBBER” Board: PCB5 This PCB is applied to the following products only; RAS-5FSG/FS3 (Before Manufacturing # U4MV0196) RAS-8~20FSG/FS3 (Before Manufacturing # U4NG1001) LED3 * LED Function on Outdoor Unit Printed Circuit Board Name of Printed Function Circuit Board This indicates the voltage between both terminal of capacitor CB1 and CB2 for inverter part.

  • Page 90: Procedure Of Checking Each Main Parts

    TROUBLESHOOTING PROCEDURE OF CHECKING EACH MAIN PARTS 1.3.1 SELF CHECKING OF PCBS USING REMOTE CONTROL SWITCH Following troubleshooting procedure is utilized for function test of PCB’s in the Indoor Unit and Outdoor Unit RUN/STOP Stop Operation Press TEMP Press both PCB Check Mode CHECK switches for 3 seconds...
  • Page 91 TROUBLESHOOTING From previous page In case that there is the next unit TEMP CHECK [Self - checking indication of the Press next unit] Repetition of Self - Checking of Unit No. "0" (ex). indication of Unit No. "1" After 7 seconds Result After 1 second “...

  • Page 92: Self-Checking Of Remote Control Switch

    TROUBLESHOOTING 1.3.2 SELF-CHECKING OF REMOTE CONTROL SWITCH Cases where CHECK switch is utilized. 1. If the remote control switch reads malfunction 2. For regular maintenance check. Turn ON the power source Only for cancellation ” of EEPROM, depress the Simultaneously depress the following 3 following 3 switches switches.
  • Page 93 TROUBLESHOOTING ” The LCD indication changes as shown below. The detected temperature of remote control thermostat is indicated at the part (A) part in the figure below. “ If the number "--" or "FF" is indicated at the "A" part, the remote control thermostat is abnormal.

  • Page 94: Self-Checking Of Indoor Unit Pcb

    TROUBLESHOOTING 1.3.3 SELF-CHECKING OF INDOOR UNIT PCB n Self-Checking by Relays on Indoor Unit PCB n To Check Abnormality on Indoor Unit PCB due to Malfunction n To check Abnormality on Indoor Unit PCB Based on Results of Checking by CHECK switch on the remote control switch and Self-Checking Function Œ...
  • Page 95 TROUBLESHOOTING n Self- Checking Procedures in Check Mode For: RCI- FSGE, RCD-FSG, RPI-FSG(E), RPC-FSGE, RPF(I)-FSG Check Item State of Mode Confirmation Method (A) Initialize Exp. Valve Exp. Valve fully open “ fully closed and Auto Louver Auto Louver is horizontally stopped. (B) Analog Test If each thermistor for intake air, discharge air and freeze If FAN operation is available, it is...

  • Page 96: Self - Checking Of 7 - Day Timer (Psc-3T)

    TROUBLESHOOTING 1.3.4 SELF - CHECKING OF 7 - DAY TIMER (PSC-3T) This procedure is utilized for regular maintenance check, and if the 7-day timer is malfunction. Turn ON the main power switch. ” Checking of LCD and Indicating Circuit: Simultaneously depress the following 4 switches, [HOUR] of All the LCD indications activated, for 5 seconds.

  • Page 97: Self - Checking Of Central Station (Psc-3S1)

    TROUBLESHOOTING 1.3.5 SELF - CHECKING OF CENTRAL STATION (PSC-3S1) This procedure is utilized for regular maintenance check, and if the central station is malfunction. Turn ON the main power switch. ” Checking of LCD and Indicating Circuit: Simultaneously depress the following 4 switches, [FAN] All the LCD indications activated, for 5 seconds.

  • Page 98: Procedure Of Cheching Other Main Parts

    TROUBLESHOOTING 1.3.6 PROCEDURE OF CHECHING OTHER MAIN PARTS n High Voltage Discharge Work for Replacing Parts DANGER: Perform this high voltage discharge work to avoid an electric shock. Procedure: a. Turn OFF the main switches and wait for three minutes. c.
  • Page 99 TROUBLESHOOTING n Checking Procedures Transistor Module Outer Appearance and Internal Circuit of Transistor Module [Case1] [Case2] Remove all the terminals of the transistor module before check. If items (a) to (e) are performed and the results are satisfactory, the transistor module is normal. Measure it under 1 kW range of a tester.
  • Page 100 TROUBLESHOOTING c. By touching the - side of the tester to the N terminal of transistor module and the + side of tester to U, V and W of transistor module, measure the resistance. If all the resistances are from 1 to 5 kW, it is normal. e.
  • Page 101 TROUBLESHOOTING b. By touching the - side of the tester to the + terminal of the diode module and the + side of tester to the ~ terminals (3 Nos.) of the diode module, measure the resistance. If all the resistances are greater than 500 kW, it is normal.
  • Page 102 TROUBLESHOOTING n Checking of Electrical Coil Parts Abbreviations Used for Colors Black Brown Yellow Green Blue Grey Orange White Name of Parts Model Electrical Wiring Diagram Wiring No. Resistance (W) Fan Motor for Indoor Unit: for: EHOCM2P4P30 RPK-1.0FSGM DC Motor RPK-1.5FSGM RPK-2.0FSGM RPK-2.3FSGM...
  • Page 103 TROUBLESHOOTING Name of Parts Model Electrical Wiring Diagram Wiring No. Resistance (W) BLK€ - óRED 23.99 REDó - ìBLU 7.67 BLUì - öGRY 6.16 REDó - úWHT 26.63 Fan Motor for Indoor Unit at 20 °C 180W for: RPI-3.0FSGE BLK€ - óRED 19.65 REDó...
  • Page 104 TROUBLESHOOTING Name of Parts Model Electrical Wiring Diagram Wiring No. Resistance (W) BLK€ - ìRED Fan Motor for Indoor Unit 146.7 REDì - úWHT 150.6 for: RCD-1.0FSG at 20 °C RCD-1.5FSG BLK€ - ìRED Fan Motor for Indoor Unit 79.6 REDì...
  • Page 105 TROUBLESHOOTING Name of Parts Model Code Resistance (W) Drain-up Motor for: 139.1 P19837 RCI-1.0FSGE, RCI-1.5FSGE, RCI-2.0FSGE, at 21 °C RCI-2.5FSGE, RCI-3.0FSGE, RCI-4.0FSGE, RCI-5.0FSGE Drain-up Motor for: KJV-1004 RCD-1.0FSG, RCD-1.5FSG, RCD-2.0FSG, at 20 °C RCD-2.5FSG, RCD-3.0FSG, RCD-4.0FSG, RCD-5.0FSG Solenoid Valve for Gas Bypass 2,018 for: ST10PA...
  • Page 106 TROUBLESHOOTING Name of Parts Model Resistance (W) Inverter Compressor Motor 1,746 for: G402DHVM at 75 °C RAS-8FSG, RAS-10FSG, RAS-16FSG, RAS-20FSG Fix Compressor Motor 4,006 G401DHM for: at 75 °C RAS-8FSG Fix Compressor Motor 3,222 G501DHM for: at 75 °C RAS-10FSG Fix Compressor Motor 2,775 G601DHM...
  • Page 107 TROUBLESHOOTING n Checking of Compressor CHECK LIST ON COMPRESSOR Client: Model: Date: Serial No: Production Date: Checker: Check Item Check Method Result Remarks € Are wires of each thermistor correctly Are THM8, THM9, THM12 and THM13 correctly connected? connected by viewing? ó...
  • Page 108 TROUBLESHOOTING Additional Information for ”CHECK LIST ON COMPRESSOR” Check Item Additional Information (Mechanism of Compressor Failure) 1 & 2 The liquid refrigerant return volume to the compressor is controlled by the discharge gas temperature Td1 when only No.1 compressor is operating. If Td1 and Td2 are reversely connected, the liquid refrigerant return volume will become small by detecting the temperatures even if the actual discharge gas temperature is high.

  • Page 109: Test Run

    TROUBLESHOOTING TEST RUN 1.4.1 TEST RUN MODE BY REMOTE CONTROL SWITCH ® Turn ON the power source of the Indoor and Outdoor Units ¯ Set the TEST RUN mode by remote control switch. Operation Lamp Depress the "MODE" and the "CHECK" switches simultaneously for more than 3 seconds.

  • Page 110: Test Run From Outdoor Unit Side

    TROUBLESHOOTING 1.4.2 TEST RUN MODE BY OUTDOOR UNIT The procedure of test run from outdoor unit side is WARNING: indicated below. Setting of this DIP switch is available with - Do not touch any other electrical parts when the power source ON. operating switches on the PCB.

  • Page 111: Checking List (Fsg And Fs3 Series)

    TROUBLESHOOTING 1.4.3 CHECKING LIST (FSG AND FS3 SERIES) n CHECK LIST ON TEST OPERATION Client: Installer: Date: Outodoor Unit Model: Outdoo Unit Serial No.: Checker: Indoor Unit Model Indoor Unit Serial No. Piping Length (m) Additional Refrigerant Charge (kg) 1. General Check Item Result Was the dip switch, DSW6 for piping length in Outdoor Unit set?
  • Page 112 TROUBLESHOOTING 3. Check Item after Sampling Data a. Cooling Operation (It is applicable when outdoor temperature is higher than 15 °C) Check Item Standard Causes Result /RZ ,QVXIILFLHQW Is H1(Compressor Frequency) + (CC (Numbers of Running Horsepower 5HIULJHUDQW Running Compressor)-1) X (v) abnormally low or of Indoor Units X 15Hz +LJK ([FHVVLYH high? (It is applicable when Intake Air Temp.
  • Page 113 TROUBLESHOOTING b. Heating Operation (It is applicable when outdoor temperature is higher than 0 °C) Check Item Standard Causes Result /RZ ,QVXIILFLHQW Is oE1(O.U. Ex. Valves Opening) abnormally low or oE1 = 30~70% 5HIULJHUDQW high when TdSH is 15 to 30 deg.? +LJK ([FHVVLYH 5HIULJHUDQW /RZ 6ROHQRLG 9DOYH...

  • Page 115: Servicing

    SERVICING 2 SERVICING OUTDOOR UNIT WARNING: TURN OFF all power source switches 2.1.1 REMOVING AIR INTAKE GRILLE 1. Remove two (2) screws for the air intake grille at the rear side of the unit. 2. Remove the air intake grille by pulling and unhooking four (4) hooks at both sides.

  • Page 116: Removing Outdoor Fan

    SERVICING WARNING: TURN OFF all power source switches 2.1.4 REMOVING OUTDOOR FAN 1. Remove the fan guard nets according to item 2.1.3, "Removing Fan Guard Nets". Flat Washer Propeller Fan 2. Remove the fans by removing the cap nuts and flat Motor shaft washers fixing the propeller fans onto the motor shafts.

  • Page 117: Removing Compressor (Ras-5Fsg And Fs3)

    SERVICING WARNING: TURN OFF all power source switches 2.1.5 REMOVING COMPRESSOR (RAS-5FSG AND RAS-5FS3) Lace Do not expose the inner refrigeration cycle to the Water-proof atmosphere for a long period of time when replacing a Cover compressor to protect the cycle from mixing water or foreing particles.
  • Page 118 SERVICING WARNING: TURN OFF all power source switches Remove the spring 6. Remove the heater cover and the spring for the oil heater, by expanding the and release the oil heater. spring as shown Spring Heater Cover Oil Heater 7. Disconnect the discharge pipe of the compressor. Use two spanners when disassembling the flare-nuts.

  • Page 119: Removing Compressors (Ras-8Fsg, Ras-10Fsg, Ras-16Fsg, Ras-20Fsg, Ras-8Fs3, Ras-10Fs3, Ras-16Fs3 And Ras-20Fs3)

    SERVICING WARNING: TURN OFF all power source switches 2.1.6 REMOVING COMPRESSORS (RAS-8FSG, RAS-10FSG, RAS-16FSG, RAS- 20FSG, Lace RAS-8FS3, RAS-10FS3, RAS-16FS3 AND Water-proof RAS-20FS3) Cover Do not expose the inner refrigeration cycle to the atmosphere for a long period of time when replacing a compressor to protect the cycle from mixing water or foreing particles.
  • Page 120 SERVICING WARNING: TURN OFF all power source switches Remove the spring 6. Remove the heater cover and the spring for the oil heater, by expanding the and release the oil heater. spring as shown Spring Heater Cover Oil Heater 7. Disconnect the discharge pipe of the compressor. Use two spanners when disassembling the flare-nuts.

  • Page 121: Removing High Pressure Switch, High Pressure Sensor And Low Pressure Sensor

    SERVICING WARNING: TURN OFF all power source switches 10. Remove three nuts fixing the compressor and remove the Suction compressor. Pipe There is no nut at the left rear side. Pay attention Notes : to this part not Pull out towards to touch the front Side 1 Pull out the compressor without removing the oil heater.
  • Page 122 SERVICING WARNING: TURN OFF all power source switches High Pressure Switch A-1. Removing High Pressure Switch (RAS-5FSG, RAS-8FSG, RAS-10FSG, Faston RAS-5FS3, RAS-8FS3 and RAS-10FS3) Brazing Part Terminal ® Disconnect the faston terminals ¯ Remove the high pressure switch from the brazing part of the discharge pipe by a burner Note: Do not expose the refrigeration cycle to the atmosphere for...

  • Page 123: Removing Coil For Reversing Valve

    SERVICING WARNING: TURN OFF all power source switches 2.1.8 REMOVING COIL FOR REVERSING VALVE DANGER : Do not touch the electrical parts when the LED3(Red) on the SNUBBER PCB(PCB5) or the LED2(Red) on the Inverter PCB(PCB3) is lit, since the voltage is higher than 50V.

  • Page 124: Removing Reversing Valve

    SERVICING WARNING: TURN OFF all power source switches Thermistor 3. Pull out the fixing plate for the thermistor from the pipe after Thermistor detaching the CORK TAPE, and remove the thermistor for Holder the liquid pipe. Seal completely by cork tape 2.1.11 REMOVING REVERSING VALVE Power Source Before starting this work, collect refrigerant into a cylinder from...

  • Page 125: Removing Electrical Components

    SERVICING WARNING: TURN OFF all power source switches RAS-5FSG, 5FS3, RAS-16FSG, 16FS3 RAS-20FSG, 20FS3 RAS-8FSG, 8FS3, RAS-10FSG, 10FS3 2.1.12 REMOVING ELECTRICAL COMPONENTS DANGER DO NOT touch the electrical parts when the LED3(Red) on the SNUBBER PCB(PCB5) or the LED2(Red) on the Inverter PCB(PCB3) is lit, since the voltage is higher than 50V.

  • Page 126: In-The-Ceiling Type (Models: Rpi-0.8Fsge, Rpi-1.0Fsge, Rpi1.5Fsge,Rpi-2.0Fsge, Rpi- 2.5Fsge, Rpi-3.0Fsge, Rpi-4.0Fsge And Rpi-5.0Fsge)

    SERVICING WARNING: TURN OFF all power source switches n Others Mounting Plate for Mounting Plate Other parts located at the rear side of PCB mounting plate and AC Chopper for PCB AC chopper mounting plate should be replaced as follows. a.

  • Page 127: Removing Indoor Fan Motor

    SERVICING WARNING: TURN OFF all power source switches 2.2.2 REMOVING INDOOR FAN MOTOR 1. Open bottom Service Access Service Access 2. Disconnect the Connector for the Motor and Capacitor 3. Remove the Fan Motor mounted on the fixing plate according to the process shown beside 4.

  • Page 128: Removing Thermistors For Liquid Pipe And Gas Pipe

    SERVICING WARNING: TURN OFF all power source switches 2.2.3 REMOVING THERMISTORS FOR LIQUID PIPE AND GAS PIPE 1. Remove the srews (4 pcs.) fixing the service cover and remove the service cover. 2. Remove the CORK TAPE and pull out the thermistors after removing the fixing plate for the thermistor NOTE: Gas Pipe...

  • Page 129: 4-Way Cassette Type

    SERVICING 4-Way Cassette Type 2.3.1 REMOVING LONG LIFE FILTER 1. The long life filter is located inside of the intake air grille. Detach the filter after opening the intake air grille. By pushing the knob in the arrow mark direction, the intake air grille can be opened.

  • Page 130: Removing Turbo Fan And Fan Motor

    SERVICING WARNING: TURN OFF all power source switches 2. Remove the intake air grille from the optional air panel. Remove four (4) screws fixing the optional air panel. (Remove the fixing screws by hooking on the hinge.) Remove the optional air panel after unhooking the hinge onto the hooks at the two positions near the drain pan.

  • Page 131: Removing Printed Circuit Board (Pcb)

    SERVICING WARNING: TURN OFF all power source switches 4. Removing Turbo Fan and Fan Motor The turbo fan can be removed after removing the fixing screws for the turbo fan, vibration absorbing rubber, special washers and flat washers. 1 Remove the wiring connector for the fan motor and the earth wire 2 Remove the motor after removing four (4) fixing screws.

  • Page 132: Removing Float Switch

    SERVICING WARNING: TURN OFF all power source switches 2.3.7 REMOVING FLOAT SWITCH 1. Remove the intake air grille according to the item 2.3.2, ”Removing Intake Air Grille”. 2. Remove the bell-mouth and turbo fan according to the item 2.3.5, ”Removing Turbo Fan and Fan Motor”. 3.

  • Page 133: Removing Drain Pan

    SERVICING WARNING: TURN OFF all power source switches NOTE: Do not remove the screw (B). Drain-Up If removed, the drain-up mechanism will drop Fixing Plate for Mechanism Drain-Up Mechanism Hose Band Drain Hose 2.3.9 REMOVING DRAIN PAN 1. Remove the optional air panel according to the item, 2.3.4, ”Removing Optional Air Panel”.

  • Page 134: Removing Thermistors For Liquid Pipe And Gas Pipe

    SERVICING WARNING: TURN OFF all power source switches 2.3.10 REMOVING THERMISTORS FOR LIQUID PIPE AND GAS PIPE 1. Remove the optional air panel according to the item 2.3.4, Figure 1 ”Removing Optional Air Panel”. 2. Remove the bell-mouth according to No.3 of item 2.3.5, ”Removing Turbo Fan and Fan Motor”.

  • Page 135: Removing Automatic Louver Motor

    SERVICING WARNING: TURN OFF all power source switches 8. Tighten the lock nut with spanner after tightening lightly by Fig. 1. Expansion Valve hand. The tightening torque shall be within the range of 12Nm(120kg-cm) ~15Nm(150kg-cm). NOTE: Pulse Motor Do not apply the strong forces such as the rotating torque and the bending load to the motor by holding the motor by Drive Part hand when tightening the lock nut.

  • Page 136: 2-Way Cassette Type

    SERVICING WARNING: TURN OFF all power source switches 4. Remove the motor with the fixing plate after removing three (3) fixing screws. Panel Fixing Plate Fixing Plate 5. Remove the motor from the fixing plate after removing two Motor (2) fixing screws, and remove the pinion from the motor after removing one (1) screw.

  • Page 137: Removing Electrical Box Cover

    SERVICING WARNING: TURN OFF all power source switches 2.4.3 REMOVING ELECTRICAL BOX COVER 1. By opening the intake air grille, the electrical box can be seen. Remove one (1) screw fixing the electrical box cover Indoor Unit and remove the cover. Electrical Box Cover 2.4.4...

  • Page 138: Removing Fan Motor

    SERVICING WARNING: TURN OFF all power source switches 2.4.5 REMOVING FAN MOTOR 1. Remove the intake air grille according to the item, 2.4.2, ”Removing Optional Air Panel”. 2. Disconnect the connector for the fan motor. 3. Remove the fan motor mounted on the fixing plate according to the procedures shown beside.

  • Page 139: Removing Bearing

    SERVICING WARNING: TURN OFF all power source switches 5. Loosen the screw of the coupling by a hexagon wrench. Motor Turn counter- clockwide to loosen Hexagon Wrench Coupling 6. Remove the motor, after removing the fixing band for the motor. Perform this work by supporting the motor by hand. Band Fixing screw 2.4.6...

  • Page 140: Removing Float Switch

    SERVICING WARNING: TURN OFF all power source switches 2.4.9 REMOVING FLOAT SWITCH 1. Remove the optional air panel according to the item 2.4.4, ”Removing Optional Air Panel”. 2. Remove the fan assembly according to the item 2.4.5, ”Removing Fan Motor”. 3.

  • Page 141: Removing Thermistors For Liquid And Gas Pipes

    SERVICING WARNING: TURN OFF all power source switches 5. Pull out the rubber plug and drain the water left in the drain pan. Prick the drain hole with a pencil, etc., to check to ensure that the drain hole is not clogged. 6.

  • Page 142: Removing Motor For Automatic Louver

    SERVICING WARNING: TURN OFF all power source switches 2.4.14 REMOVING MOTOR FOR AUTOMATIC LOUVER Screw 1. Remove the optional air panel according to the item 2.4.4, ”Removing Optional Air Panel”. Motor Cover 2. Remove the motor cover at the piping side after removing two (2) fixing screws.

  • Page 143: Removing Front Panel

    SERVICING WARNING: TURN OFF all power source switches 3. Lift up the air filter, detach the hooks and draw the air filter downward Air Filter 2.5.2 REMOVING FRONT PANEL Bush 1. Press the “PUSH” marks at both ends of the front panel Screw Front Panel and open the suction grille by pulling toward the front side.

  • Page 144: Removing Motor For Automatic Louver

    SERVICING WARNING: TURN OFF all power source switches 2.5.3 REMOVING MOTOR FOR AUTOMATIC LOUVER Connector (White) 1. Remove the front panel according to the item 2.5.2, Connector (Black) ”Removing Front Panel”. 2. Remove the electrical box according to the item 2.5.5, Screws (4pcs.) “Removing Electrical Box Cover”.

  • Page 145: Removing Electrical Box Cover

    SERVICING WARNING: TURN OFF all power source switches Vertical Louver 5. Removing Thermistor for Discharge Air Remove the thermistor for discharge air from the holder of the vertical louver and the hook at the right side of the air outlet. Thermistor for Holder Discharge Air...

  • Page 146: Removing Indoor Pcb

    SERVICING WARNING: TURN OFF all power source switches 2.5.6 REMOVING INDOOR PCB Electrical Box Earth Wire Hook 1. Remove the front panel according to the item 2.5.2, Cover Hook ”Removing Front Panel”. 2. Remove one screw (1) for the electrical box cover. Low Voltage 3.

  • Page 147: Removing Fan And Fan Motor

    SERVICING WARNING: TURN OFF all power source switches 5. Detach the hook holding the left side of the heat exchanger Screw and remove one (1) screw fixing the heat exchanger. Detach Hook 6. Remove one (1) screw fixing the heat exchanger and detach the hook holding the right side of the heat exchanger.

  • Page 148: Removing Electronic Expansion Valve Coil

    SERVICING WARNING: TURN OFF all power source switches Fan Motor 5. Draw the fan leftward with lifting up the bearing side of the Lift up the fan and draw it fan slightly, the fan and the fan motor are removed. leftward Loosen Screw 6.

  • Page 149: Floor Type

    SERVICING WARNING: TURN OFF all power source switches NOTE: Fig. 1. Expansion Valve Do not apply the strong forces such as the rotating torque and the bending load to the motor by holding the motor by hand when tightening the lock nut. Pulse Motor Although the direction of the eccentric part of the motor is assembled with the eccentric part of the motor directed...

  • Page 150: Removing Air Filter

    SERVICING WARNING: TURN OFF all power source switches 2.6.2 REMOVING AIR FILTER 1. The air filter is located at the inner side of the intake air grille. Remove all the intake air grilles. 2. Remove the air filter by pulling the knob of the air filter. 2.6.3 REMOVING DISCHARGE AIR GRILLE 1.

  • Page 151: Removing Printed Circuit Board (Pcb)

    SERVICING WARNING: TURN OFF all power source switches Connector 5. Disconnect the wiring connector for the fan motor. Remove the wiring assembly and connector. Wiring Assembly 6. Remove the casing (1) by pushing the hook part at four (4) positions towards the inner side. Hook Casing 7.

  • Page 152: Removing Thermistors For Liquid Pipe And Gas Pipe

    SERVICING WARNING: TURN OFF all power source switches 5. Remove the electrical box cover after removing two (2) fixing screws. Electrical Box Cover Screw 6. The electrical box can be turned up to an angle of 90° by removing two (2) fixing screws and unhooking the hook at the rear side of the electrical box.

  • Page 153: Floor Concealed Type

    SERVICING WARNING: TURN OFF all power source switches 5. Remove the piping cover after removing two (2) fixing screws for the partition plate and four (4) fixing screws for piping cover Piping Cover Partition Plate Screw 6. Remove CORK TAPE and pull out the thermistor after removing the thermo clip for the thermistors.

  • Page 154: Removing Front Covers

    SERVICING WARNING: TURN OFF all power source switches 2.7.2 REMOVING FRONT COVERS 1. Remove the air filter according to the item, 2.7.1, ”Removing Air Filter”. 2. Remove the front lower cover after removing screws (1.0HP: 9pcs., 1.5HP: 10pcs.) at the lower part of the front cover.

  • Page 155: Ceiling Type

    SERVICING WARNING: TURN OFF all power source switches CEILING TYPE 2.8.1 REMOVING AIR FILTER 1. The air filter is located inside of the intake air grille. Remove the air filter after opening the intake air grilles. 2. Push the knobs of the intake air grille backwards. 3.

  • Page 156: Removing Fan Motor

    SERVICING WARNING: TURN OFF all power source switches 3. Pull out the deflector including the bearing after removing Fixing Screw four (4) fixing screws at the right and left. Air Deflection Air Deflection Bearing 2.8.4 REMOVING FAN MOTOR 1. Open the intake air grille according to the item, 2.8.1, ”Removing Air Filter”.

  • Page 157: Removing Bearing

    SERVICING WARNING: TURN OFF all power source switches 5. Remove the casing (1) by pushing the hook part at four (4) positions towards the inner side. Hook Casing 6. Loosen the screws by a hexagon wrench. Motor Loosen Allen Key Coupling 7.

  • Page 158: Removing Coupling

    SERVICING WARNING: TURN OFF all power source switches 2.8.6 REMOVING COUPLING 1. Remove the side covers according to the item, 2.8.2, ”Removing Side Cover”. 2. Separate the casing into two (2) pieces according to the item, 2.8.4, ”Removing Fan Motor”. Loosen the screw for the coupling by a hexagon wrench.

  • Page 159: Removing Printed Circuit Board (Pcb)

    SERVICING WARNING: TURN OFF all power source switches 4. Remove the thermistors for the liquid pipe and gas pipe. Side Cover Thermistor for Gas Pipe Heat Exchanger Thermistor for Liquid Pipe 2.8.9 REMOVING PRINTED CIRCUIT BOARD (PCB) 1. Open the intake air panel according to the item, 2.8.1, ”Removing Air Filter”.

  • Page 160: Removing Total Heat Exchanging Rotor

    SERVICING WARNING: TURN OFF all power source switches 2.9.2 REMOVING TOTAL HEAT EXCHANGING ROTOR 1. Turn off the power source for the total heat exchanger. Heat Exchange Rotor Air Discharge 2. Remove the air filters for supply air and exhaust air before removing the total heat exchanging rotor.

  • Page 161: Cleaning Indoor Unit Heat Exchanger

    SERVICING 2.10 CLEANING INDOOR UNIT HEAT EXCHANGER 2.10.1 REQUIRED TOOLS FOR CLEANING (FOR ALL INDOOR UNITS) Tool Remark Cleaning Water Pump A water pump equipped with a tank is recommended Water Tank Clean Water Approx. 18 liters Nozzle Brush (non-metal) If the heat exchanger is heavily clogged with dust, remove it with this brush.
  • Page 162 SERVICING Remark Cleaning Water Collector In-the-Celing Type 2-Way Cassette Type Wall Type Ceiling Type Insert the Insert the Bar Transparent Vinyl Sheet Boss Hose Inner Side of Ø120 hole should be covered with felt sheet to insert the spray nozzle. Cleaning Water Collector Kit 4-Way Cassette Type Part...

  • Page 163: Cleaning 4-Way Cassette Type Indoor Unit

    SERVICING WARNING: TURN OFF all power source switches 2.10.2 CLEANING 4-WAY CASSETTE TYPE INDOOR UNIT Spread a vinyl sheet over the floor to protect furnitures, etc. from cleaning water before this work. Procedure: NOTES: 1 Remove the optional air panel according to page 2-15 Remove the drain pan after removing drain water on the and the item, 2.3.4, ”Removing Optional Air Panel”.
  • Page 164 SERVICING WARNING: TURN OFF all power source switches 2. Scratch off the dust on the inner surface of the heat exchanger downwards using a brush. Collect all dust in a bucket or carton box. 3. Suspend the cleaning water collector from the indoor unit. a.
  • Page 165 SERVICING WARNING: TURN OFF all power source switches 5. Insert the spray nozzle through the hole of the cleaning water collector. Operate the water pump and clean the dust on the heat exchanger. After cleaning, spray clean water to remove the cleaning water. Adjust the pressure of the water pump so as not to damage the fins.

  • Page 166: Cleaning 2-Way Cassette Type Indoor Unit

    SERVICING WARNING: TURN OFF all power source switches 7. Check the insulation of the drain pump with a megohm- meter. Check to ensure that the insulation is grater than 1 MW when 500V is applied. 8. Connect wiring as it was. 9.
  • Page 167 SERVICING WARNING: TURN OFF all power source switches 6. Suspend the cleaning water collector from the indoor unit. Indoor Unit a. Connect a rope to the suspension bracket of the indoor unit put is downwards. b. Insert the support bar into the cleaning water collector hole.

  • Page 168: Cleaning Wall Type Indoor Unit

    SERVICING WARNING: TURN OFF all power source switches 2.10.4 CLEANING WALL TYPE INDOOR UNIT Spread a vinyl sheet over the floor to protect furnitures, etc. from cleaning water before this work 1. Remove each parts according to the item 2.5. ”Wall Type”. 2.
  • Page 169 SERVICING WARNING: TURN OFF all power source switches 4. By lifting the drain hose and put the end in a bucket. Bucket Drain Hose 5. Removing Dust on Heat Exchanger Remove the dust on the heat exchanger with a brush by scratching dust downwards.

  • Page 170: Cleaning Ceiling Type Indoor Unit

    SERVICING WARNING: TURN OFF all power source switches 8. After checking that no power is supplied, connect the drain pipe and remove the insulation tape for the wiring connectors and then mount the front cover correctly. 9. Check insulation of the terminal board in the electrical box. If the insulation is greater than 1MW by a 500 Megohm- meter, it is normal.

  • Page 171: Removing Remote Controller

    SERVICING WARNING: TURN OFF all power source switches 12. Check insulation of the terminal board with a megohm- meter. Check to ensure that the insulation is greater than 1 MW when 500V is applied. 13. Check to ensure that water can flow smoothly after pouring water on the drain pan.

  • Page 172: Collecting Refrigerant For Replacing Indoor Unit

    SERVICING 2.12 COLLECTING REFRIGERANT FOR REPLACING INDOOR UNIT 1. Prepare an empty refrigerant cylinder at -760mmHg with a charging hose. Measure the empty cylinder’s weight. 2. After shutting the stop valve on the cylinder, connect the charge hose to the liquid line stop valve. Connect a pressure gauge to the check joint on the gas line stop valve.

  • Page 173: Main Parts

    MAIN PARTS 3. MAIN PARTS 3.1. INVERTER 3.1.1. CALCULATION OF OPERATING FREQUENCY Indoor Unit Intake Air temperature Sensing Intake air Temperature by Thermistor Micro-Computer for Indoor unit Micro-Computer for outdoor Unit n Temperature n Total Operating Trans- Setting Difference miting Indoor units Calculation of Temperature...

  • Page 174: Specifications Of Inverter

    MAIN PARTS 3.1.2. SPECIFICATIONS OF INVERTER RAS-5FSG, RAS-5FS3, RAS-8FSG, RAS-8FS3, RAS-10FSG, RAS-10FS3, RAS- Applicable Models 16FSG, RAS-16FS3, RAS-20FSG, RAS-20FS3 3 Phase 380 / 415V – 10% 50Hz –5% Applicable Power Source Output Voltage (Maximum) 380 / 415V, 3 Phase Output Current (Maximum) 14.0A (5,8 and 10HP) / 16.5A (16 and 20HP) Time Rating Continuous...
  • Page 175 MAIN PARTS Protection Function Overcurrent Protection for Inverter ® ¯ ° ± ® Short-circuit Trip of Arm (Internal Protection of Transistor Module) ¯ Instantaneous Overcurrent Trip (Internal Protection of Transistor Module) ° Instantaneous Overcurrent Trip ± Electronic Thermal Trip Condition is maintained longer than 30 seconds or accumulated longer than 3.5 minutes during 10 minutes sampling time.

  • Page 176: Arrangement Of Inverter Power Unit

    MAIN PARTS 3.1.3. ARRANGEMENT OF INVERTER POWER UNIT Model Parts Name 380 / 415V, 50Hz Fin (mm) (2003255350) Transistor Module PM25RSB120 Diode Module DF40AA160 Diode Module RM201-1A-20F...
  • Page 177 MAIN PARTS Model Parts Name 380 / 415V, 50Hz Fin (mm) (2003255350) Transistor Module 6MBP25RA120-05 Diode Module 6RI30G-160...
  • Page 178 MAIN PARTS 3.1.4. INVERTER TIME CHART Main Circuit Power Source Frequency LOW Frequency HIGH All bit 1 All bit 1 Operation Frequency Instruction Output Voltage Soft Start-Stop (Frequency) The changing speed depends on the outer setting Failure Signal Output Activation of Protection Device Protection Transmit...

  • Page 179: Protective Function

    MAIN PARTS 3.1.5. PROTECTIVE FUNCTION n Protection of Transistor Module n Excessive High or Low Voltage for Inverter a. Level of Detection a. Level of Detection 1. When some of the output terminals between "U" and 1. When the voltage of direct current is greater than "V", "V"...

  • Page 180: Thermistor

    MAIN PARTS 3.2. THERMISTOR Thermistors for Outdoor Unit Thermistor for discharge Gas Temperature (THM8 for Inverter Compressor, THM9, THM12 and THM13 for Constant Speed Compressor) Thermistor for Evaporating temperature(THM10 and THM11) Thermistor for Outdoor Ambient temperature (THM7) Thermistors for Indoor Unit Thermistor for Indoor Heat Exchanger Gas Pipe Temperature...

  • Page 181: Resistance Value Of Thermistor

    MAIN PARTS 3.2.1. RESISTANCE VALUE OF THERMISTOR n Discharge Gas Overheating Prevention (Thermistor for Checking Upper Part of Compressor, THM8, THM9, THM12 and THM3) a. A thermistor checking the temperature of the compressor upper part is installed, to prevent discharge gas from overheating.
  • Page 182 MAIN PARTS n Thermistor for Room Temperature Control (Indoor n Thermistor for Discharge Air Temperature Control Unit Air Inlet Temperature Thermistor, THM1) (Indoor Unit Discharge Air Temperature Thermistor, THM2) The room temperature control is performed by this air inlet temperature thermistor, THM1. The setting temperatures are This thermistor (THM2) has been installed to prevent cold indicated on the remote control switch with figures.

  • Page 183: Electronic Expansion Valve

    MAIN PARTS 3.3. ELECTRONIC EXPANSION VALVE 3.3.1. ELECTRONIC EXPANSION VALVE FOR OUTDOOR UNITS Micro-Computer Pulse Signal Pulse Motor 2-Phase Permanent Magnetic Pulse Motor Control 0 to 500 Pulse by 1 Pulse Refrigerant Flow Control Precise control Needle Items Specifications For Main Cycle of: Models to be Applied RAS-5FSG, RAS-5FS3, RAS-8FSG, RAS-8FS3, RAS-10FSG, RAS-10FS3, RAS- 16FSG, RAS-16FS3, RAS-20FSG, RAS-20FS3...

  • Page 184: Electronic Expansion Valve For Indoor Units

    MAIN PARTS 3.3.2. ELECTRONIC EXPANSION VALVE FOR INDOOR UNITS Magnet Micro-Computer Coil Pulse Motor Pulse Signal 2-Phase Permanent Magnetic Pulse Motor Gear Control 0 to 2,000 Pulse by 1 Pulse Driver Refrigerant Flow Control Bellows Precise control Valve EDM Type Items Specifications Type...

  • Page 185: Pressure Sensor

    MAIN PARTS 3.4. PRESSURE SENSOR n High Pressure Control n Low Pressure Control The high pressure during heating operation is detected by a The suction pressure during cooling operation is detected by high pressure sensor, and compressor frequencies are a low pressure sensor, and compressor frequencies are controlled by the proportional controlling method with controlled by the proportional controlling method with operating capacity of indoor units so that the high pressure is...

  • Page 186: Noise Filter

    MAIN PARTS 3.5. NOISE FILTER The noise filter decreases the leakage of noise made by the inverter to the power supply side. Terminals indicated with "OUT" are connected to the inverter side and terminals indicated with "IN" to the power supply side.
  • Page 187 MAIN PARTS Items Specifications Model 20PTT10-H Rated current AC415V 20A -20 °C ~ 85 °C Permissible Temperature Range Circuit Diagram DATE CODE Units: mm...

  • Page 188: Capacitor

    MAIN PARTS 3.6. CAPACITOR This part is used for changing the alternative current to the direct current for the inverter. Connect two capacitor in line and used. Specifications Items Specifications Model 400LGN2700M Capacity of Static Electricity 2700mF Rated Voltage 400V -20 °C ~ 95 °C Permissible Temperature Range 3.7.
  • Page 189 MAIN PARTS Items Specifications 0.5mH – 10% (at 1kHz) Character Rated current 12.2mW – 20% (at 20°C) Direct Resistance -20 °C ~ 65 °C Permissible Temperature Range 0.5mH 37A 86–2...

  • Page 191: Circuit Diagram For Printed Circuit Board Of Outdoor Unit

    MAIN PARTS 3.8. CIRCUIT DIAGRAM FOR PRINTED CIRCUIT BOARD OF OUTDOOR UNIT n Control Board 1: PCB1 (1/2)
  • Page 192 MAIN PARTS n Control board 1: PCB1 (2/2)
  • Page 193 MAIN PARTS n Fan Control Board: PCB2...
  • Page 194 MAIN PARTS n Snubber Board:PCB5 n Inverter Board: PCB3...

  • Page 195: Circuit Diagram For Printed Circuit Board Of Indoor Unit

    MAIN PARTS 3.9. CIRCUIT DIAGRAM FOR PRINTED CIRCUIT BOARD OF INDOOR UNIT n Control Board: PCB of Indoor unit (Except for RPK Model) n Fan Control Relay Board: PCB of indoor Unit...
  • Page 196 MAIN PARTS n Control Board: PCB of Indoor Unit (Only for RPK Model)

  • Page 197: Circuit Diagram For Printed Circuit Board Of Remote Control Switch

    MAIN PARTS 3.10.CIRCUIT DIAGRAM FOR PRINTED CIRCUIT BOARD OF REMOTE CONTROL SWITCH n PC-2H2...
  • Page 198 MAIN PARTS n PC-5H...

  • Page 199: Circuit Diagram For Printed Circuit Board Of Receiver

    MAIN PARTS 3.11.CIRCUIT DIAGRAM FOR PRINTED CIRCUIT BOARD OF RECEIVER...

  • Page 201: Optional Function

    OPTIONAL FUNCTION 4. OPTIONAL FUNCTION 4.1. INDOOR UNIT 4.1.1. REMOTE CONTROL ON/OFF FUNCTION n Remote Control 2 (Pulse Signal Input) This function provides a control to stop and start the system automatically from a remote place. Three methods This is an ON/OFF function from a remote place by using are available by using each signal from a building pulse signal.
  • Page 202 OPTIONAL FUNCTION NOTES: NOTES: This function is available when "4.1.3 Power Supply This function is available when "4.1.3 Power Supply ON/OFF 2 (after Power Failure)" is applied. ON/OFF 2 (after Power Failure)" is applied. Picking up signal within 10 seconds after power supply Picking up signal within 10 seconds after power supply is turned ON is not available due to initializing of is turned ON is not available due to initializing of...

  • Page 203: Power Supply On/Off 1 (Automatic Operation When Power Supply On)

    OPTIONAL FUNCTION 4.1.3. POWER SUPPLY ON/OFF 2 (RESTARTING Table 4. 1 Specifications on Required Components for FUNCTION AFTER POWER FAILURE) (1)~(4) Functions: Manufacturer or Set the dip switch on the PCB for the indoor unit as shown Component Remarks Specifications in the figure below to restart the system automatically even OMRON Mini Power Relay if power failure continues for more than 2 seconds.

  • Page 204: Operation Control By Remote Temperature Sensor

    OPTIONAL FUNCTION Operation During: 4.1.6. COOLING OR HEATING OPERATION Cooling Operation: MODE SETTING CHANGE BY EXTERNAL Compressor is ON by closing terminals 2 and 3 at CN3 Compressor is OFF by opening terminals 2 and 3 at INPUT (Level Signal Input) By utilizing this function, the cooling or heating operation Heating Operation: mode can be changed by giving a contact signal from the...

  • Page 205: Picking Up Operation Signal

    OPTIONAL FUNCTION 4.1.7. PICKING UP OPERATION SIGNAL n Picking Up Operation Signal n Picking Up Heating Operation Signal (RPK-FSGM is not available) This function is utilized to pick up the operation signal. By this function, operation signal at a remote place can be This function is utilized to pick up the heating operation checked, or operation at the fresh air intake fan motor can signal.

  • Page 206: Outdoor Unit

    OPTIONAL FUNCTION n Picking Up Cooling Operation Signal (RPK-FSGM is n Picking Up "Thermo-ON" Signal during Cooling not available) Operation (Only for RCD-FSG(E) and RPF(l)-FSG(E) models) This function is utilized to pick up the cooling operation signal. The contact of RYa is closed when cooling This function is utilized to pick up the cooling "Thermo-ON"...

  • Page 207: Demand

    OPTIONAL FUNCTION 2. By pressing the push-switches PSW2 and PSW3, 4.2.1. DEMAND input/output terminal name is changed. The following In the case that the demand input terminals on the outdoor shows the display changes when PSW2 and PSW3 are unit printed circuit board are short-circuited, compressor(s) pushed.

  • Page 208: Fixing Operation Mode

    OPTIONAL FUNCTION ΠWiring Diagram Example of Snow Sensor 4.2.3. FIXING OPERATION MODE Indoor Unit PCB In the case that the fixing input terminals of the operation mode on the outdoor PCB are short-circuited, the operation mode can be fixed at the cooling or heating mode. Short-circuit between Terminals 1 and 2 of CN17: Fixed Heating Mode Short-circuit between Terminals 2 and 3 of CN17: Fixed...

  • Page 209: Defrosting Condition Changeover

    OPTIONAL FUNCTION 4.2.5. 4.2.6. DEFROSTING CONDITION CHANGEOVER INDOOR FAN CONTROL DURING THERMO-OFF AT HEATING By changing the position of No.5 on dip switch, DSW5, defrosting operation conditions can be changed. By setting the dip switch as shown below, the indoor fan operates for 2 min.

  • Page 210: All Season Cooling Operation

    OPTIONAL FUNCTION Operation 4.2.9. NIGHT SHIFT (LOW SOUND) OPERATION The limitation of Area of the permissible Operation By Changing No.2 of the dip switch, DSW5, the night shift outdoor Stoppage (low sound) operation can be set. In case of the night shift temperature operation, the cooling capacity is decreased down to 60%.

  • Page 211: Picking Up Signals From Outdoor Unit Printed Circuit Board

    OPTIONAL FUNCTION 4.2.10. PICKING UP SIGNALS FROM OUTDOOR n Picking Up Compressor ON Signal UNIT PRINTED CIRCUIT BOARD With this procedure the compressor signal can be picked up. The method is explained in the figure below. The The parts applied to picking up operation signals are shown required part is indicated in Table 4.

  • Page 212: Remote Control Switch (Pc-2H2)

    OPTIONAL FUNCTION 4.3. REMOTE CONTROL SWITCH (PC-2H2) & 4.3.1. NAME OF PARTS CAUTION: 3UHVV VZLWFKHV RQO\ ZLWK ILQJHUV 'R QR SUHVV VZLWFKHV E\ DQ\ RWKHU LWHP DV LW PD\ GDPDJH WKH VZLWFKHV Liquid Crystal Display (L.C.D) Section ¶ LOUVER (Swing Louver Operation) Switch ·...

  • Page 213: Simultaneous Operation

    OPTIONAL FUNCTION 4.3.2. SIMULTANEOUS OPERATION ΠSetting of Rotary Switches: n Simultaneous Indoor Unit Operation with Remote When indoor units are connected to the same Control Switch outdoor unit, it is unnecessary to set rotary switches, because they are automatically DANGER: addressed.

  • Page 214: Operation System With Two Remote Control Switches

    OPTIONAL FUNCTION False Number of Connected Units is Indicated b. Decide the number of units. The method should be the 3. When the indicated number of connected units is same as in "Simultaneous Indoor Unit Operation with smaller than the actual number or zero, presumable One Remote Control Switch".
  • Page 215 OPTIONAL FUNCTION n Changing of Optional Functions and Setting n Selection of Indoor Unit Conditions a. At the optional setting mode, the indication on the a. At the optional setting mode, the indication on the remote control switch is changed as shown in the right remote control switch is changed as shown in the right figure.

  • Page 216: Optional Functions Of Remote Control Switch

    OPTIONAL FUNCTION n Setting Items of Optional Functions Items Optional Functions Individual Setting Contents Setting Condition † Removal of Heating Temperature Not Available ® Calibration Available † Circulation Function at Heating Not Available ¯ Thermo-OFF Available † Enforced 3 Minutes Minimum Not Available °...
  • Page 217 OPTIONAL FUNCTION ¯ ³ Circulator Function at Heating Thermo-OFF Fixing of Setting Temperature In case that the fan speed is changed to "LOW" tap at This function is utilized when changes in setting heating Thermo-OFF, there is a case that the room air is temperature are not required.

  • Page 218: Indication Of Address (Adds) And Refrigerant Cycle Number (Rn)

    OPTIONAL FUNCTION 4.3.6. INDICATION OF ADDRESS (ADDS) AND REFRIGERANT CYCLE NUMBER (RN) b. Indication of Address and Refrigerant Cycle Number The address and the refrigerant cycle number can be The indication of the address and the refrigerant cycle indicated on the liquid crystal display of the remote control number of the indoor unit shown in the below figure.

  • Page 219: Optional Wireless Remote Control Switch, Pc-Lh3

    OPTIONAL FUNCTION 4.4. OPTIONAL WIRELESS REMOTE CONTROL SWITCH, PC-LH3 4.4.1. NAME OF PARTS ± RUN/STOP Switch: " " The operation is started when this switch is pressed and the operation is stooped when this switch is pressed again. ² MODE Selection Switch " "...

  • Page 220: Identifying Of Indoor Units Installed Side By Side

    OPTIONAL FUNCTION 4.4.2. IDENTIFYING OF INDOOR UNITS d. Set the rotary switch (RSW) on the indoor PCB of the INSTALLED SIDE BY SIDE indoor unit B as shown in the right figure. NOTES: This function is not available in case of simultaneous operation mode.
  • Page 221 OPTIONAL FUNCTION a. Installation of Air Panel for Wireless Control d. Set the Rotary Switches (RSW) on the printed circuit In case of simultaneous operation of plural (up to 16) boards of respective units as shown in the next table. units by the wireless remote control switch, apply the air panel for wireless control only to the unit to be Setting position...

  • Page 222: Emergency Operation

    OPTIONAL FUNCTION f. Attach the nameplate of unit number for outdoor unit e. The unit is operated. (field-supplied) corresponding to the unit number of the Operating Condition indoor unit. Operation Cooling Heating Setting Temperature 21 °C 30 °C Air Flow Mode High High When operating the unit by the wireless remote control...

  • Page 223: Optional Functions Of Wireless Remote Control Switch

    OPTIONAL FUNCTION b. Set the dip switches ® as shown in the table below. After dip switch setting, close the cover of the receiver part or the grille of panel. Dip Switch Optional Function 5 5 5 Filter Standard Option †...

  • Page 224: 7-Day Timer (Psc-3T)

    OPTIONAL FUNCTION 4.5. 7-DAY TIMER (PSC-3T) 4.5.1. NAME OF PARTS By plugging in this timer to the optional remote control switch, Functions daily ON/OFF operation control throughout the week is The 7-day timer provides the following functions: available. 1 ON/OFF Setting Time in a Week 7-Day timer has power failure back-up dry cell.

  • Page 225: Operation Procedure For Running Pattern

    OPTIONAL FUNCTION 4.5.2. OPERATION PROCEDURE FOR RUNNING PATTERN 1 Supply Power to the Unit 2 Setting the present Day: Depress the "SET/MONITOR" switch for more than 3 (three) seconds. The "SET" indication blinks. This indicates the "CLOCK" mode. Set the "|" mark with present day by depressing the "PRESENT DAY"...

  • Page 226: Optional Central Station (Psc-3S1)

    OPTIONAL FUNCTION 4.6. OPTIONAL CENTRAL STATION (PSC-3S1) 4.6.1. NAME OF PARTS µ This central station is able to control simultaneously 16 indoor MNRT/SET Switch units as one group and at maximum 16 groups (totally 256 indoor units). When setting mode is selected, the following are available.

  • Page 227: System

    OPTIONAL FUNCTION 4.6.2. SYSTEM n Setting of Rotary Switches Set the unit number of all the units using the rotary switch & (DSW1) of indoor unit PCB. CAUTION: The following functions by the Central Station are not WARNING: available. Therefore, special attention to the following is Do not set the same indoor unit number in the same required when designing your systems.
  • Page 228 OPTIONAL FUNCTION n System of more than 16 units n Setting of Rotary Switches Layout and Electrical Wiring Set the number by using the rotary switch, DSW1 on the PCB In the case that more than 16 indoor units including 16 units in the indoor units.

  • Page 229: Operation Procedure For Central Station

    OPTIONAL FUNCTION 4.6.3. OPERATION PROCEDURE FOR CENTRAL STATION ATTENTION: The following functions at the Central Station are not Precautions for Operation available. Therefore, special attention to the Œ Battery Backup following is required when designing systems. The central station (multi-function centralized controller) Œ...
  • Page 230 OPTIONAL FUNCTION n OPERATION PROCEDURE FOR INDIVIDUAL RUN/STOP OPERATION 1 Press the [UNIT] switch (~ or }) to set the unit number. 2 When [RUN/STOP] switch is pressed in this status, the unit will Mode operate or stop. Monitor n OPERATION PROCEDURE FOR OPERATION STATUS OF ALL UNITS (UP TO 16 UNITS CONNECTED) : Run : Stop or not Connected : (Blinking): Alarm...

  • Page 231: Field Work Instruction

    FIELD WORK INSTRUCTION 5. FIELD WORK INSTRUCTION 5.1. BURNT-OUT COMPRESSOR DUE TO INSUFFICIENT REFRIGERANT CHARGE n Question and Answer for Field Work Example 1: Burnt-out Compressor due to Insufficient Refrigerant Charge Phenomenon After commissioning, alarm code "08" sometimes occurred and compressors were burnt out after 2 month operation.

  • Page 232: Abnormally High Operating Sound (In-The-Ceiling Type Indoor Unit)

    FIELD WORK INSTRUCTION 5.3. ABNORMALLY HIGH OPERATING SOUND (IN-THE-CEILING TYPE INDOOR UNIT) n Question and Answer for Field Work Example 3: Abnormally High Operating Sound (In-the-Ceiling Type Indoor Unit) Phenomenon Operating sound during "Hi" speed was abnormally high. Cause The indoor units was installed without ducts. Due to almost no external static pressure, abnormally big air volume was supplied, resulting in higher air speed through the heat exchanger.

  • Page 233: Not Cooling Well Due To Insufficient Installation Space For Outdoor Unit

    FIELD WORK INSTRUCTION 5.5. NOT COOLING WELL DUE TO INSUFFICIENT INSTALLATION SPACE FOR OUTDOOR UNIT n Question and Answer for Field Work Example 5: Not Cooling Well due to Insufficient Installation Space for Outdoor Unit Cooling operation was well performed through the intermediate season. However, the cooling Phenomenon operation was not well available when the outdoor temperature was higher than 35 °C.

  • Page 234: Select Guide Of Drain Pipe For Indoor Unit

    FIELD WORK INSTRUCTION 5.6. SELECT GUIDE OF DRAIN PIPE FOR INDOOR UNIT n Selecting Method of Drain Pipe Diameter 1. Calculation of Drain Flow Volume NOTE Calculate from that the drain flow volume is VP20 and VP25: Not Applicable to Common Pipe approximately 3 (I/hr) per 1HP of the indoor unit VP30, 40 and 50: Applicable to Common Pipe nominal capacity.

  • Page 235: Maintenance Work

    FIELD WORK INSTRUCTION Example: System A Outdoor Unit System B Outdoor Unit System B System A Refrigerant: 50 kg Refrigerant: 60 kg Floor Floor Floor Floor 400 m² Floor 120 m² 70 m² 40 m² 70 m² Gas Leak Detector Opening: 0.06 m²...

  • Page 236: Service & Maintenance Record

    FIELD WORK INSTRUCTION 5.9. SERVICE & MAINTENANCE RECORD Check Item Action Judgement Check Item Action Judgement Is service space 19 Check for Leakage ditto Good sufficient? at Strainer Good 20 Check for Leakage Short circuit of Discharged Air? at electronic Ex. ditto Good Good...

  • Page 237: Service & Maintenance Record By 7-Segment Display

    FIELD WORK INSTRUCTION 5.10. SERVICE & MAINTENANCE RECORD BY 7-SEGMENT DISPLAY n Data Sheet for Checking by 7-Segment Display Outdoor Unit Model (Serial No. RAS- (Serial No. RAS- (Serial No. RAS- (Serial No. RAS- (Serial No. RAS- (Serial No. 1. Operation Mode 2.

  • Page 238: Service & Maintenance Record By Remote Control Switch

    FIELD WORK INSTRUCTION 5.11. SERVICE & MAINTENANCE RECORD BY REMOTE CONTROL SWITCH n Data Sheet for Checking by Remote Control Switch Time Client: I.U. Model Installation Date: I.U. Serial No. System No: I.U. No./Alarm Code Date Checked: Check Mode 1 Check Mode 2 1 - 2 1 - 2...
  • Page 240 SMGB0001- 06/01 - Printed in Spain...

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