Troubleshooting FAQ

No.1 Fault: Discharge pressure is too high

Possible cause:

  • There is air or other non-condensable gas existed in the system.
  • Water heat exchanger is scaling or fouling blockage.
  • The circulation water volume is not enough
  • Refrigerant charging is too much.

Detection and elimination method:

  • Vent the air from water heat exchanger
  • Wash and clean the water heat exchanger
  • Examine the water system pipeline and pump.
  • Drain part of the refrigerant

 

No.2 Fault: Discharge pressure is too low.

Possible cause:

  • Liquid refrigerant flow through evaporator to compressor, which make foam for the frozen oil
  • Suction pressure is too low
  • Refrigerant charging is too less, the refrigerant air goes into liquid pipeline

Detection and elimination method:

  • Examine and adjust the expansion valve, make sure the expansion valve temperature sensor bulb is close connected with the air suction pipe, and absolutely insulated with the ambient environment.
  • Please refer to “Fluorine filling if suction pressure too low”

 

No.3 Fault: Suction pressure is too high.

Possible cause:

  • Discharge pressure is too high.
  • Refrigerant charging is too much.
  • Liquid refrigerant flow through evaporator to compressor.

Detection and elimination method:

  • Drain part of the refrigerant.
  • Examine and adjust the expansion valve, make sure the expansion valve temperature sensor bulb is close connected with the air suction pipe, and absolutely insulated with the ambient environment.

 

No.4 Fault: Suction pressure is too low.

 Possible cause:

  • Ambient temperature is too low.
  • The evaporator liquid inlet or compressor suction pipe is blocked,expansion valve unadjusted, or failed.
  • The refrigerant is not enough in the system.

 Detection and elimination method:

  • Adjust suitable overheat temperature, examine whether there is Fluorine leakage from the expansion valve temperature sensor bulb.
  • Examine Fluorine leakage.
  • Examine the installation condition.

 

No.5 Fault: Compressor stopped because of high pressure protection.

Possible cause:

  • The water inlet temperature is too high, circulation water is not enough.
  • The high pressure stop setting is not correct, the air suction overheat greatly.
  • Fluorine filling is too much.

 Detection and elimination method:

  • Examine water system pipeline and water pump.
  • Examine the high pressure switch.
  • Examine the Fluorine filling volume, drain part of refrigerant.

 

No.6 Fault: Compressor stopped because of motor overloading.

Possible cause:

  • The voltage is too high or too low.
  • Discharge pressure is too high or too low
  • Device ;loading failure.
  • Ambient temperature is too high.
  • Motor or connecting terminal is in short circuit.

Detection and elimination method:

  • The voltage should be controlled within more or less 20V than rated voltage, and phase difference within ±30%.
  • Examine the compressor current,compare with the full loading current indicated in the user manual.
  • Improve air ventilation.

 

No.7 Fault: Compressor stopped because of built-in thermostat.

Possible cause:

  • The voltage is too high or too low.
  • Discharge pressure is too high.
  • The refrigerant in the system is not enough

Detection and elimination method:

  • Examine the voltage to make sure it is within the specialized range.
  • Examine the discharge pressure and find out the reason.
  • Examine whether there is Fluorine leakage

 

No.8 Fault: Compressor stopped because of low voltage production.

Possible cause:

  • Dry filter clogging.
  • Expansion valve failure.
  • The refrigerant is not enough

Detection and elimination method:

  • Examine, maintain, or change dry filter.
  • Adjust or change expansion valve.
  • Fill in refrigerant.

 

No.9 Fault: High noise of compressor.

Possible cause:

  • There is liquid hammer for liquid refrigerant flowing through evaporator compressor.

Detection and elimination method:

  • Adjust liquid supply, examine whether normal for the expansion valve and air suction overheat degree.

 

No.10 Fault: Compressor can not start.

Possible cause:

  • Over current relay is tripped,insurance is burn.
  • The control circuit is not connected.
  • No current.
  • The pressure is too low, which can not conduct the pressure switch.
  • The contactor coil is burn out.
  • Water system failure, relay is tripped

Detection and elimination method:

  • Set the control circuit in manual mode, restart the compressor after maintenance.
  • Examine controlling system.
  • Examine power supply.
  • Examine whether the refrigerant is too less.
  • Reconnect, adjust two of the wiring.