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Symptoms
Shutdown against low
pressure protection of
the
compressor
Failed startup of the
compressor
Temperature sensor
protection
Pressure transducer
error
Flow switch protection
Protection against the
failed 4–way valve
Protection against the
failed compressor IPM
module
A Series Inverter Modular Air-cooled Chiller (Heat Pump)
Probable causes
1. The electrostatic expansion valve is
faulty.
2. The low pressure cutoff is faulty.
3. Refrigerant is insufficient.
4. The entering chilled water
temperature is 5°C lower than the
rated.
5. The chilled water flow is too low.
1. The overcurrent relay tripped off
and the fuse was burnt out.
2. The control circuit was open.
3. There is no current.
4. Low/high pressure protection.
5. The contact coils is burnt out.
6. The water flow is cut off.
7. The wireless controller raised the
alarm signal. ON/ OFF time setting by
the wireless controller is incorrect.
8. The sensed temperature exceeded
the rated.
1. The bulb plug and the main board
plug were connected incorrectly.
2. The temperature bulb was
damaged.
3. The main board was damaged.
1. The pressure sensor is open-
circuited.
2. The pressure sensor is short-
circuited.
3. The pressure sensor is damaged.
1. The water pump has not started.
2. The water flow is too low.
3. The water flow switch was
damaged.
4. There was air inside the water
system.
1. The entering and leaving water
temperature sensor fell off or installed
incorrectly.
2. The 4–way valve was damaged.
1. The voltage suddenly dropped.
2. The compressor drive board was
damaged.
44
Recommended action
1. Replace the coils or even the
valve body.
2. Check the low pressure
cutoff.
3. Check and charge
refrigerant.
4. Check if the chilled water is
down-temperature.
5. Adjust the chilled water flow.
1. Replace it.
2. Check wiring of the control
system.
3. Check the power supply.
4. See corresponding statement
above.
5. Replace it.
6. Check the water system.
7. Check the alarm type and
take corresponding corrective
measure.
8. Check and reset it.
1. Check if the bulb plug was
connected to the correct
main board plug.
2. Replace it.
1. Check the circuit of the
pressure sensor.
2. Replace it.
1. Start the water pump.
2. Adjust the water flow.
3. Adjust the water flow.
4. Dispel air inside the water
system.
1. Check if the entering and
leaving water temperature
sensors were installed correctly
and if silica gel at the probe for
heat conduction was applied
properly.
2. Replace it.
1. Check if it occurred before
protection.
2. Replace it.
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