Fujitsu AUXB04GALH Service Manual page 174

Trouble shooting 89
Peripheral device No Cooling/ Heating
General check procedure
1. Check Error code on the VRF system. (Remote controller, Service tool, etc)
2. Check LED brinks on the controler PCB of DX-KIT
3. Check Error code on the peripheral device.
4. Check none of protection function is operating on the system.
Protection functions (For the description of protective conditions, see the service manual.)
- Abnormal Temperature: Compressor temperature, Discharge temperature, Heat-sink temperature, IDU HEX temp.
- Abnormal pressure: High pressure, Low pressure,
- Abnormal on devices: EEV coil, FAN motor, Compressor Frq,
Check Point 1: Temperature sensors
Sensor position / Wire connection / Temperature detection
- Measure the resistance of sensor at the terminal board, and compare the temperature (transformed with resistance value)
with the actual detecting temperature by using the Service tool.
Gas / Liquid Sensor Chracterristcs (Rough value)
Temperature ( F)
°
Temperature ( C)
°
Resistance Value (kOhm)
Inlet / Outlet Air Sensor Chracterristcs (Rough value)
Temperature ( ° F)
Temperature ( ° C)
Resistance Value (kOhm)
If the sensor position was incorrect, install the sensor to the correct position
If the temperature detection was wrong, replace the sensor.
Check Point 2: EEV
Wire connection / EEV movment
- Measure the resistance of EEV coil and measure the DC12V power input at the terminal board.
EEV1: CN10_Pin No.1 - Pin No.6, Pin No.1 - Pin No.4, Pin No.2 - Pin No.3, Pin No.2 - Pin No.5
EEV2: CN11_Pin No.1 - Pin No.6, Pin No.1 - Pin No.4, Pin No.2 - Pin No.3, Pin No.2 - Pin No.5
- Check EEV initialisation movment by the power reset of DX-Kit.
- Check refrigerant flowing by measuring the temperature of pipe inlet and pipe outlet.
Read wire Resistance value (20°C)
White - Red
Yellow - Brown
Orange - Red
Blue - Brown
If the resistance of EEV coil was not correct, replace the EEV unit.
If the DC12V did not appear on the terminal, check DCV power supply on CN102.
No Voltage : Replace the power supply PCB,
DC12V appeares: Replace the controller PCB.
If the EEV did not react after power reset, or no refrigerant flowing, replace the EEV unit.
Check Point 3: External factor
Air circulation obstruction
Design mismatch (Capacity, FAN speed mismatch, Field setting (Analog signal input) etc,)
Peripheral device abnormal (See the Serivce manual for the peripheral device)
Forecast of Cause :
1. Temperature controlling
32 41 50 59
0 5 10 15
33.6 25.2 20.1 15.8
32 41 50 59
0 5 10 15
168.6 129.8 100.9 79.1
CLOSE
Example : Hot Gas
Pipe (In)
200 ±10%
2. EEV controlling
68 77 86 95 104
20 25 30 35 40
12.5 10.0 8.0 6.5 5.3
68 77 86 95 104
20 25 30 35 40
62.5 49.8 40.0 32.4 26.3
Pipe (Out)
04-98
3. External Factor
113 122
45 50
4.3 3.5
113 122
45 50
21.2 17.8
OPEN
Example : Hot Gas
Pipe (In)
Pipe (Out)