Fujitsu ARC90LHTA Service Instruction
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Fujitsu ARC90LHTA Service Instruction

Duct type inverter
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SERVICE
INSTRUCTION
R410A
AMP Air Conditioning
SPLIT TYPE
ROOM AIR CONDITIONER
DUCT
INVERTER
Models
Indoor unit
AR* C72LHTA
AR* C90LHTA
www.ampair.co.uk | sales@ampair.co.uk
type
Outdoor unit
AO* A72LALT
AO* A90LALT

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Summary of Contents for Fujitsu ARC90LHTA

  • Page 1 SPLIT TYPE ROOM AIR CONDITIONER DUCT type INVERTER SERVICE INSTRUCTION Models Indoor unit Outdoor unit AR* C72LHTA AO* A72LALT AR* C90LHTA AO* A90LALT R410A AMP Air Conditioning www.ampair.co.uk | sales@ampair.co.uk...

  • Page 2: Table Of Contents

    CONTENTS 1. DESCRIPTION OF EACH CONTROL OPERATION 1. COOLING OPERATION....................01-01 2. HEATING OPERATION....................01-02 3. DRY OPERATION......................01-03 4. AUTO CHANGEOVER OPERATION................01-04 5. INDOOR FAN CONTROL....................01-05 6. OUTDOOR FAN CONTROL..................01-07 7. COMPRESSOR CONTROL..................01-08 8. TIMER OPERATION CONTROL................... 01-09 9.

  • Page 3: Description Of Each Control Operation

    R410A DUCT type INVERTER 1 . DESCRIPTION OF EACH CONTROL OPERATION AMP Air Conditioning www.ampair.co.uk | sales@ampair.co.uk...

  • Page 4: Cooling Operation

    1-1. COOLING OPERATION 1-1-1 COOLING CAPACITY CONTROL A sensor (room temperature thermistor) built in the indoor unit will usually perceive difference or variation between a set temperature and present room temperature, and controls the operation frequency of the compressor. * If the room temperature is 2°C higher than a set temperature, the compressor operation frequency will attain to maximum performance.

  • Page 5: Heating Operation

    1-2. HEATING OPERATION 1-2-1 HEATING CAPACITY CONTROL A sensor (room temperature thermistor) built in the indoor unit will usually perceive difference or variation between a set temperature and present room temperature, and controls the operation frequency of the compressor. * If the room temperature is lower 3°C than a set temperature, the compressor operation frequency will attain to maximum performance.

  • Page 6: Dry Operation

    1-3. DRY OPERATION 1-3-1 INDOOR UNIT CONTROL The compressor rotation speed shall change according to set temperature and room temperature variation which the room temperature sensor of the indoor unit has detected as shown in the Fig 3. ( Table 3 : Compressor Rotational Speed Range ) X zone 42rps AO* A72LALT...

  • Page 7: Auto Changeover Operation

    1-4. AUTO CHANGEOVER OPERATION When the air conditioner is set to the AUTO mode by remote control, operation starts in the optimum mode from among the HEATING, COOLING and MONITORING modes. During operation, the optimum mode is automatically switched in accordance with temperature changes. The temperature can be set between 18°C and 30°C in 1 °C steps.

  • Page 8: Indoor Fan Control

    1-5. INDOOR FAN CONTROL 1. Fan speed ( Table 5 : Indoor Fan Speed ) AR* C72LHTA Standard (72Pa) Static Pressure 1 (0Pa) Static Pressure 2 (50Pa) Static Pressure 3 (150Pa) Operation mode motor HEATING COOLING HEATING COOLING HEATING COOLING HEATING COOLING 1040...
  • Page 9 3. COOLING OPERATION Switch the airflow [Auto], and the indoor fan motor will run according to a room temperature, as shown in Fig.6. On the other hand, if switched in [Hi] ~ [Lo], the indoor motor will run at a constant airflow of [COOL] operation modes Lo, Med, Hi, as shown in Table 5.

  • Page 10: Outdoor Fan Control

    1-6. OUTDOOR FAN CONTROL 1. Outdoor Fan Motor The outdoor fan speed is decided depending on the operation mode and the outdoor temperature. The compressor and the fan start-up at the same time, and the fan stops after the compressor stops and 60 seconds has passed. The fan doesn't operates for 5 seconds after the fan stops.

  • Page 11: Compressor Control

    1-7. COMPRESSOR CONTROL 1. OPERATION SPEED RANGE The operation speed of the compressor is different based on the operation mode as shown in Table 7. (Table 7 : Compressor Operation Speed Range) COOLING HEATING 77rps 30rps AO* A72LALT 28rps 85rps 42rps 86rps 30rps...

  • Page 12: Timer Operation Control

    1-8. TIMER OPERATION CONTROL 1-9. TIMER OPERATION CONTROL1-9. TIMER OPERATION CONTROL 1-8-1 Wired Remote Controller AR-WAE1E ON / TIMER OFF / TIMER WEEKLY TIMER TEMPERATURE SET BACK TIMER 1. ON / OFF TIMER OFF timer : When the clock reaches the set time, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
  • Page 13 2-2. DAY OFF setting The DAY OFF setting is only available for days for which weekly settings already exist. If the operating time carries over to the next day (during a next day setting), the effective DAY OFF range will be set as shown below. Normal DAY OFF Operation mode...

  • Page 14: Electronic Expansion Valve Control

    1-9. ELECTRONIC EXPANSION VALVE CONTROL The most proper opening of the electronic expansion valve is calculated and controlled under the present operating condition based on the following values. The compressor speed, the temperatures detected by the discharge temperature sensor, the indoor heat exchanger sensor, the outdoor heat exchanger sensor, and the outdoor temperature sensor.

  • Page 15: Test Operation Control

    1-12. 4-WAY VALVE EXTENSION SELECT At the time when the air conditioner is switched from the Cooling mode to Heating mode, the compressor is stopped, and the 4-way valve is switched in 3 minutes later after the compressor stopped. 1-13. TEST OPERATION CONTROL With Wired Remote Controller Under the condition where the air conditioner stops, press the MASTER CONTROL button and the FAN CONTROL button simultaneously for 2 seconds or more, and the test operation control...
  • Page 16 (5) Press the SELECT button (SW108), and display the code number of the mode you want to get on the LED105. Cooling test operation Heating test operation Test operation stop LED105 LED104 LED105 LED104 LED105 LED104 *2: Numbers other than 00-02 are used during maintenance. Please do not use during normal operation. (6) After confirming the operation mode you want to set, press ENTER button (SW109) for more than 3 seconds.

  • Page 17: Pump Down

    1-14. PUMP DOWN Confirm that the power is off, and the than ERROR lamp POWER/MODE PO WE R ER ROR MODE lamp open the service panel. LED 101 LED 102 (GREEN) (R ED) 7 Segment Turn the power on. MODE/EXIT LED Lamp LED105 LED104...

  • Page 18: Compressor Preheating

    1-15. COMPRESSOR PREHEATING When 30 minutes has passed after power-on or operation stop, the preheating is started according to the outdoor unit heat exchanger (outlet) temperature as shown in Fig.11. It applies the current to compressor and the compressor is heated. (By heating the compressor, warm air is quickly discharged when operation is started.) When operation was started, the preheating ends.

  • Page 19: Defrost Operation Control

    1-18. DEFROST OPERATION CONTROL 1. CONDITION OF STARTING THE DEFROST OPERATION The defrost operation starts when the outdoor heat exchanger temperature sensor detects the temperature lower than the values shown in Table 9. (Table 9 : Condition of starting Defrost Operation) Condition of 1st defrost operation Compressor contiguous Below 10min.
  • Page 20 3. Defrost Flow Chart The defrosting shall proceed by the integrating operation time and outdoor heat exchanger emperature as follows. Heating operation start : Compressor ON (Not defrosted for 10 minutes) (Integrating defrost (In case of 1st defrost) (In case of 2nd and later defrost) (Constant monitoring) Compressor integrating Compressor integrating...

  • Page 21: Off Defrost Operation Control

    1-19. OFF DEFROST OPERATION CONTROL When operation stops in the HEATING mode, if frost is adhered to the outdoor unit heat-exchanger, the defrost operation will proceed automatically. In this time, if is displayed on the wired RC, the outdoor unit will allow the heat-exchanger to defrost, and then stop. 1.

  • Page 22: Various Protections

    1 -20. VARIOUS PROTECTIONS 1. DISCHARGE GAS TEMPERATURE OVER RISE PREVENTION CONTROL 1-1. Discharge Temperature Protection 1 (a). When the discharge temperature becomes more than 115°C, the compressor is stopped under all conditions. (b). The compressor restarts after 7 minutes has passed from the protection stop by (a). (c).

  • Page 23: High Pressure Protection Control

    4 . HIGH PRESSURE PROTECTION CONTROL 4-1. Abnormal Stop <After the start-up and 1 minute has passed> (a). When the high pressure value becomes more than 4.10 MPaG, the compressor is stopped under all conditions. (b). When 3 minutes has passed after the protection stop by (a), and high pressure value becomes *[ A ] MPaG or less, the protection is released and the compressor is restarted.
  • Page 24 6. HEATING OVERLOAD PROTECTION In Heating mode, the compressor speed is controlled as following based on the detection value of the indoor heat-exchanger temperature sensor and pressure sensor. 6-1. High Temperature Release Control <Indoor unit control> (Fig 19 : High temperature release control by indoor unit) B zone When Indoor unit When Indoor unit...

  • Page 25: Economy Operation

    4 . LOW VOLTAGE PROTECTION When the temporary blackout, the load current is reduced to delay the switching power-off, and reset of microcomputer is delayed. A low voltage signal is detected every 1msec. (Table 12 : Low voltage protection) Condition Operation Compressor : stop When level [ L ] is detected 3msec...

  • Page 26: Drain Pump Operation

    1-23. DRAIN PUMP OPERATION 1. When the compressor starts, the drain pump starts simultaneously. 2. The drain pump operates continuously for 3 minutes after the compressor is turned off. 3. When the compressor stops by the "Anti- freezing protection", the drain pump is turned off in 1 hour after the compressor stops.

  • Page 27: Low Noise Operation

    1-24. LOW NOISE OPERATION The compressor speed and the outdoor unit fan speed are limited to reduce the operation noise by External Input. During the LOW NOISE OPERATION, "CURRENT OVERLOAD OPERATION", "ECONOMY OPERATION" and "PEAK CUT OPERATION" are effective, and the outdoor unit operates by lowest current of them. However, during the DEFROST OPERATION, the compressor operates by the speed for DEFROST OPERATION.

  • Page 28: Description Of Display Unit

    1-26. DESCRIPTION OF DISPLAY UNIT 1-26-1 Field setting switches Remove the front panel of the outdoor unit and the cover of the electrical component box to access the print circuit board of the outdoor unit. Print circuit board switches for various settings and LED displays are shown in the figure. ERROR Lamp (LED102) POWER/MODE Lamp (LED101) It will flash rapidly in case of an error.
  • Page 29 (3) If SELECT button (SW108) is pressed in the state of (2), contents of all the errors will display. Error 1. Error 2. Error 3. LED105 LED104 LED105 LED104 LED105 LED104 (4) If ENTER button (SW109) is pressed, it will return to state of (1). If no action is taken, it will return to the state of (1) after 60 seconds.

  • Page 30: Field Setting And Monitor Mode List

    1-26-6 Field Setting and Monitor Mode List ITEM Setting Mode Classification Information contents CODE No. The rotational speed of the outdoor unit fan motor is displayed Operation of Rotational speed of outdoor unit fan motor Monitor mode each part [ 0 ~ 999 ] rpm The rotational speed of the compressor is displayed Rotational speed of INV compressor [ F1 ]...

  • Page 31: Trouble Shooting

    R410A DUCT type INVERTER 2 . TROUBLE SHOOTING AMP Air Conditioning www.ampair.co.uk | sales@ampair.co.uk...

  • Page 32: Error Display

    2. TROUBLE SHOOTING 2-1 ERROR DISPLAY 2-1-1 WIRED REMOTE CONTROLLER DISPLAY The Error code operate as follows according to the error contents. Indoor Unit : AR* C72 / 90LHTA Trouble Error Contents Error Code Shooting Wired remote controller error Serial error (Serial reverse transfer error) Room temperature thermistor error Indoor heat exchanger temperature thermistor (middle) error Outdoor heat exchanger temperature...

  • Page 33: Outdoor Unit Display

    2-1-2 OUTDOOR UNIT DISPLAY Please refer the blinking pattern as follows. Outdoor Unit : AO* A72 / 90LALT The Error LED operate as follows according to the error contents. Trouble Error Contents Error Code Shooting E. 06. Outdoor heat exchanger temperature (outlet) error thermistor E.

  • Page 34: Trouble Shooting With Error Code

    2-2 TROUBLE SHOOTING WITH ERROR CODE Trouble shooting 1 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Serial error (Serial reverse transfer error) Detective Actuators: Detective details: When the indoor unit cannot properly receive the serial signal from Outdoor unit Main PCB outdoor unit for 10 seconds or more.
  • Page 35 Trouble shooting 2 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Indoor signal error Detective Actuators: Detective details: Indoor unit controller PCB When the indoor unit cannot properly receive the serial signal from outdoor unit for 10 seconds or more. Indoor unit filter PCB Forecast of Cause: 1.
  • Page 36 Trouble shooting 3 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Indoor heat exchanger temperature thermistor (middle) Error Detective Actuators: Detective details: Indoor unit controller PCB When Heat exchanger temperature thermistor (middle) open or Heat exchanger temperature short-circuit is detected at power ON.
  • Page 37 Trouble shooting 4 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Wired remote controller error Detective Actuators: Detective details: Indoor unit controller PCB When the indoor unit cannot properly receive the signal from Wired remote controller Wired remote controller for 1 minute or more.
  • Page 38 Trouble shooting 5 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Room temperature thermistor error Detective Actuators: Detective details: Indoor unit controller PCB When Room temperature thermistor open or short-circuit is Room temperature thermistor detected at power ON. Forecast of Cause : 1.
  • Page 39 Trouble shooting 6 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Outdoor discharge pipe temperature thermistor error Detective Actuators: Detective details: Outdoor unit Main PCB When Discharge pipe temperature thermistor open or short-circuit is detected at power ON or while running the compressor. Discharge pipe temperature thermistor Forecast of Cause : 1.
  • Page 40 Trouble shooting 7 Indicate or Display: OUTDOOR UNIT Error Method: Outdoor heat exchanger temperature Refer to error code table. thermistor (outlet) error Detective Actuators: Detective details: Outdoor unit Main PCB When Heat exchanger temperature thermistor (out) open or Heat exchanger temperature thermistor (Out) short-circuit is detected at power ON or while running the compressor.
  • Page 41 Trouble shooting 8 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Outdoor temperature thermistor error Detective Actuators: Detective details: Outdoor unit Main PCB When Outdoor temperature thermistor open or short-circuit is detected at power ON or while running the compressor. Outdoor temperature thermistor Forecast of Cause : 1.
  • Page 42 Trouble shooting 9 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Heat sink thermistor (inverter) error Detective Actuators: Detective details: Outdoor unit Inverter PCB When Heat sink temperature thermistor (INV) open or Heat sink temperature thermistor (INV) short-circuit is detected at power ON or while running the compressor.
  • Page 43 Trouble shooting 10 Indicate or Display: OUTDOOR UNIT Error Method: Compressor temperature thermistor error Detective Actuators: Detective details: Outdoor unit Main PCB When Compressor temperature thermistor open or short-circuit is detected at power ON or while running the compressor. Compressor temperature thermistor Forecast of Cause : 1.
  • Page 44 Trouble shooting 11 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Power supply frequency detection error Detective Actuators: Detective details: Indoor unit Controller PCB When power frequency is not detected by 4 seconds after power-on. Indoor unit Filter PCB Forecast of Cause: 1.
  • Page 45 Trouble shooting 12 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. IPM Protection Detective Actuators: Detective details: When over current flows in Inverter PCB, the compressor stops. Outdoor unit Inverter PCB After the compressor restarts, if the same error is repeated within Compressor 40sec, the compressor stops reappear.
  • Page 46 Trouble shooting 13 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Compressor location error Detective Actuators: Detective details: When "compressor location detection error" is detected consecutively Outdoor unit Inverter PCB 5 times, within 40 seconds after start-up. Forecast of Cause : 1.
  • Page 47 Trouble shooting 14 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Outdoor Unit Fan Error Detective Actuators: Detective details: When outdoor fan rotation speed is less than 100rpm in 20 seconds Outdoor unit Main PCB after fan motor starts, fan motor stops. Outdoor fan motor After fan motor restarts, if the same operation within 60sec is repeated Main Filter PCB...
  • Page 48 Trouble shooting 15 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Inverter error Detective Actuators: Detective details: When there is communication error between Main PCB Outdoor unit Main PCB and Inverter PCB. Outdoor unit Inverter PCB When "Inverter PCB cement resistor difference voltage between both ends"...
  • Page 49 Trouble shooting 16 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Indoor fan motor 1 lock error Indoor fan motor 1 rev. error Detective Actuators: Detective details: Indoor unit Controller PCB When the condition that actual rev. of Indoor Fan is 1/3 or less. Or the condition of fan speed is 0rpm is continued more than 56 seconds.
  • Page 50 Trouble shooting 17 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Discharge temperature error Detective Actuators: Detective details: Outdoor unit Main PCB When the discharge temperature becomes higher than 115°C. Discharge pipe temperature thermistor When detecting it 2 times within 24 hours, the compressor stops. Forecast of Cause : 1.
  • Page 51 Trouble shooting 18 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Excessive high pressure protection Detective Actuators: Detective details: Outdoor unit Main PCB In cooling operation, after 1 minute or more compressor starts, when outdoor heat exchanger temperature is 68 °C and above. Outdoor fan motor Heat exchanger temp.
  • Page 52 Trouble shooting 19 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. 4-way Valve Error, Solenoid Valve Error Detective Actuators: Detective details: When the indoor heat exchanger temperature is compared with Indoor unit Controller PCB the room temperature, and either following condition is detected Heat exchanger temperature thermistor continuously two times, the compressor stops.
  • Page 53 Trouble shooting 20 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Pressure switch error, Pressure sensor error Detective Actuators: Detective details: Outdoor unit Main PCB 30 seconds or more after power-on, when pressure sensor detection value detects the condition below continuously for 30 seconds or more. Pressure sensor High pressure : Ps <...
  • Page 54 Trouble shooting 21 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Compressor temperature error Detective Actuators: Detective details: Outdoor unit Main PCB When the compressor temperature becomes 112°C or more. Compressor temperature thermistor Forecast of Cause : 1.
  • Page 55 Trouble shooting 22 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Low pressure error Detective Actuators: Detective details: In cooling operation, 1 minute or more after compressor's start-up, Outdoor unit Main PCB when pressure sensor detects 0.12 MPa or less for consecutive Pressure sensor 5 minutes.
  • Page 56 Trouble shooting 23 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Model distinction error (Indoor) Detective Actuators: Detective details: When power is on and there is some below case. Indoor unit Controller PCB 1. When model information of EEPROM is incorrect 2.
  • Page 57 Indicate or Display: Trouble shooting 24 INDOOR UNIT Error Method: Refer to error code table. Indoor fan motor 1 drivers circuit error Indoor fan motor 2 drivers circuit error Detective Actuators: Detective details: When a momentary power cut off. Indoor unit Power PCB When do not start fan motor.

  • Page 58: Trouble Shooting With No Error Code

    2-3 TROUBLE SHOOTING WITH NO ERROR CODE Trouble shooting 25 Forecast of Cause: 1. Power supply failure Indoor unit - No Power 2. External cause 3. Electrical components defective Check Point 1 : Check installation condition Isn’t the breaker down? Check loose or removed connection cable.
  • Page 59 Trouble shooting 26 Forecast of Cause: 1. Power supply failure Outdoor unit - No Power 2. External cause 3. Electrical components defective Check Point 1 : Check installation condition Isn’t the breaker down? Check loose or removed connection cable. >> If abnormal condition is found, correct it by referring to manual. Check Point 2 : Check external cause at indoor unit and outdoor unit (Voltage drop or noise) Instant voltage drop of ----- Check if there is a abnomally large load in the same power supply...
  • Page 60 Trouble shooting 27 Forecast of Cause: 1. Setting / Connection failure No Operation (Power is ON) 2. External cause 3. Electrical component defective Check Point 1 : Check indoor and outdoor installation condition Indoor unit - Check incorrect wiring between indoor unit - remote controller, or terminals between indoor units. Or, check if there is an open cable connection.
  • Page 61 Trouble shooting 28 Forecast of Cause: 1. Indoor unit error 2. Outdoor unit error No cooling / No heating 3. Effect by surrounding environment 4. Connection pipe / Connection wire failure 5. Refrigeration cycle failure Check Point 1 : Check indoor unit Does indoor unit fan run on high fan? Is Air filter dirty? Is Heat exchanger clogged?
  • Page 62 Trouble shooting 29 Forecast of Cause : 1. Abnormal installation (Indoor unit / outdoor unit) Abnormal Noise 2. Fan failure (Indoor unit / outdoor unit) 3. Compressor failure (Outdoor unit) Diagnosis method when abnormal noise is occurred Abnormal noise is coming from indoor unit. Abnormal noise is coming from outdoor unit.

  • Page 63: Service Parts Information

    2-4 SERVICE PARTS INFORMATION SERVICE PARTS INFORMATION 1 Compressor Diagnosis method of Compressor (If outdoor unit LED displays error, refer to Trouble shooting ) Does not start up Stops soon after starting up Abnormal noise Is there open or loose connection Is there open or loose connection Check if vibration noise by loose bolt or contact noise...
  • Page 64 SERVICE PARTS INFORMATION 2 Inverter Compressor Check Point 1 : Check connection Check terminal connection of Compressor Check connection of Inverter PCB (Loose or incorrect wiring) (Loose or incorrect wiring) TM808 BLACK TM807 TM806 Inverter PCB WHITE WHITE BLACK Inverter PCB Compressor Compressor Check Point 2 : Check winding resistance...
  • Page 65 SERVICE PARTS INFORMATION 3 Outdoor Unit Electronic Expansion Valve (EEV) Check Point 1 : Check Connections Check connection of connector (Loose connector or open cable) EXPANSION VALVE COIL BLUE CN70 ORANGE YELLOW WHITE Check Point 2 : Check coil of EEV Check Point 4 : Check Noise at start up Remove connector, check each winding resistance of Coil.
  • Page 66 SERVICE PARTS INFORMATION 4 (Mounted on Inverter PCB) Check Point 1 Disconnect the connection wires between the Inverter PCB - electrolytic capacitor and Inverter PCB - Inverter Compressor. Set the tester to the "Resistance" mode, and measure the resistance between the following terminals. Terminal Red wire (P) - screw terminals U/V/W White wire (N) - screw terminals U/V/W...

  • Page 67: Appending Data

    R410A DUCT type INVERTER 3 . APPENDING DATA AMP Air Conditioning www.ampair.co.uk | sales@ampair.co.uk...

  • Page 68: Function Setting

    3-1. FUNCTION SETTING 3-1-1 INDOOR UNIT Follow the instructions in the Local Setup Procedure, which is supplied with the remote control, in accordance with the installed condition. After the power is turned on, perform the Function Setting on the remote control. The settings may be selected between the following two: Function Number or Setting Value.
  • Page 69 1-4. Setting the Heater Room Temperature Correction Depending on the installed environment, the room temperature sensor may require a correction. The settings may be selected as shown in the table below. Factory setting) Setting Description Function Number Setting Value Standard (No correction) Warmer control (+1.0°C) Slightly warmer control (+0.5°C)
  • Page 70 1-7. Cool Air Prevention This setting is used to set the fan speed when the compressor stops once the room temperature has reached the set temperature during heating operation. Factory setting) Setting Description Function Number Setting Value Super low Follow the setting on the remote controller (corresponding to ventilation) 1-8.
  • Page 71 3-1-3 Procedures to change the Function Setting This procedure changes the function settings used to control the indoor unit according to the installation conditions. Incorrect settings can cause the indoor unit to malfunction. This procedure should be performed by authorized installation or service personnel only. Perform the "FUNCTION SETTING"...
  • Page 72 3-1-4 WIRED REMOTE CONTROLLER Wired remote controller Can be used. ( Do not change.) Dual remote controller setting Filter reset operation and filter display ( Duct model is nonfunctional.) DIP SW Can be used. ( Do not change.) Can be used. ( Do not change.) Memory backup setting SWITCH POSITION Wired remote controller...

  • Page 73: Thermistor Resistance Values

    3-2. THERMISTOR RESISTANCE VALUES 3-2-1 Indoor unit Indoor heat exchanger thermistor Room temperature thermistor Tempe C Resistance(K ) Voltage(V) Tempe C Resistance(K ) Voltage(V) -10.0 58.25 1.15 -10.0 312.27 0.69 -5.0 44.03 1.39 -5.0 233.21 0.88 33.62 1.66 176.03 1.10 25.92 1.94 134.23...
  • Page 74 Heat sink thermistor Outdoor heat exchanger thermistor Outdoor Temprature thermistor Tempe C Resistance(K ) Voltage(V) Tempe C Resistance(K ) Voltage(V) Tempe C Resistance(K ) Voltage(V) -30.0 95.57 0.24 -30.0 200.20 0.80 -30.0 94.26 0.08 -25.0 68.89 0.32 -25.0 144.32 1.05 -25.0 67.95 0.11...
  • Page 75 1116,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan February. 2014 Printed in Japan AMP Air Conditioning www.ampair.co.uk | sales@ampair.co.uk...

This manual is also suitable for:

Arc72lhtaAoa72laltAoa90lalt

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