AERMEC HMG - Troubleshooting

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TROUBLESHOOTING
MALFUNCTION CAUSE OF THE PROBLEM SOLUTION OF THE PROBLEM
Blockage caused by the
compressor high pressure
protection
1. Incomplete aspiration.
2. Ambient temperature too high.
3. The condenser fins are dirty and there are
obstructions.
4. Inadequate condensation air flow and failed
condenser fan.
5. High pressure shutdown failed.
6. Overcharged refrigerant.
1. Aspirate the system again and recharge the
refrigerant.
2. Improve ventilation.
3. Clean the condenser fins.
4. Repair the condenser fan.
5. Check the high pressure switch.
6. Check the refrigerant charge and drain some
refrigerant.
Blockage caused by
overload of the compressor
motor
1. The voltage is too high or too low.
2. The discharge pressure is too high or too low.
3. The return water temperature is too high.
4. The overloaded element is defective.
5. The ambient temperature is too high.
6. There is a phase loss for the compressor.
7. The compressor motor is short-circuited.
1. Check if the voltage is or not less than 80%
and the phase difference does not exceed ±
30%.
2. Check the discharge pressure and identify the
causes.
3. Check the return water temperature and
identify the causes.
4. Check the compressor current.
5. Improve ventilation.
6. Check the three phase resistances.
Stop for compressor low
pressure protection
1. The electrostatic expansion valve is defective.
2. The low pressure cut-off is defective.
3. The refrigerant is insufficient.
4. Entering chilled water temperature is 5 ° C
lower than nominal.
5. The chilled water flow is too low.
1. Replace the coils or even the valve body.
2. Check the low pressure cut.
3. Check and charge the refrigerant.
4. Check if the chilled water is low temperature.
5. Adjust the flow of chilled water.
Failure to start the
compressor
1. The overcurrent relay has tripped and the fuse
has blown.
2. The control circuit was open.
3. There is no current.
4. Low / high pressure protection.
5. The contact coils are burned out.
6. The water flow is open circuit.
7. The wireless controller has generated the
alarm signal. The ON / OFF time setting from
the wireless controller is incorrect.
8. The detected temperature has exceeded the
nominal one.
1. Replace it.
2. Check the wiring of the control system.
3. Check the power supply.
4. See the corresponding statement above.
5. Replace it.
6. Check the water system.
7. Check the type of alarm and take the
corresponding corrective action.
8. Check and reset it.
Temperature sensor
protection
1. The card plug and the main card plug were
connected incorrectly.
2. The temperature bulb has been damaged.
3. The main board has been damaged.
1. Check if the plug of the bulb has been
connected to the correct plug of the main
board.
2. Replace it.
Pressure transducer error
1. The pressure sensor is open circuit.
2. The pressure sensor is short-circuited.
3. The pressure sensor is damaged.
1. Check the pressrue sensor circuit.
2. Replace it.
Flow switch protection
1. The water pump did not start.
2. The water flow is too low.
3. The water flow switch is damaged.
4. There was air inside the water system.
1. Start the water pump.
2. Adjust the water flow.
3. Adjust the water flow.
4. Dissipate the air inside the water system.
4-way valve faulty
1. The entering and leaving water temperature
sensor has been dropped or not installed
correctly.
2. The 4-way valve has been damaged.
1. Check whether the entering and leaving water
temperature sensors have been installed
correctly and whether the silica gel on the
heat conducting probe has been applied
correctly.
2. Replace it.
Protection against faulty
compressor IPM module
1. The voltage suddenly dropped.
2. The compressor drive board has been
damaged.
1. Check if it occurred before protection.
2. Replace it.