Fault symptom 1: insufficient cooling capacity
Cause analysis
(1) The room or box is not sealed or the thermal insulation performance is poor
(2) The evaporator frost is too thick
(3) The efficiency of the compressor deteriorates
(4) The expansion valve is too large or too small
(5) There is more air in the system
(6) The filter drier or infusion pipeline is not smooth
(7) There is a large amount of lubricating oil stored in the evaporator
Exclusion Method
(1) Overhaul or replace thermal insulation materials
(2) Regular defrosting
(3) Check whether the leakage of the suction and exhaust valve plate, cylinder or piston is too large, and repair it
(4) Adjust the opening degree of the valve according to the requirements of the working conditions
(5) Discharge according to the "vent" operation
(6) Find out the cause of the blockage and eliminate it after dismantling and inspection
(7) Remove lubricating oil and improve oil return measures
Fault symptom 2: The compressor cannot be started or stopped immediately after starting
Cause analysis
(1) The power supply is powered off or less than 10% of the rated value
(2) The pressure controller or temperature controller is improperly adjusted, so that the contact is always open
(3) The motor winding is burned or short-circuited
(4) The compressor exhaust shut-off valve is not opened, causing the action of the high-pressure controller
(5) Transformers, contactors, intermediate relay coils burned out or poor contact contact
(6) The compressor is stuck or bitten inside, resulting in overload
Exclusion Method
(1) Eliminate circuit faults and supply power according to product requirements
(2) Adjust the position of the contact according to the requirements of the working conditions
(3) Dismantle and repair the motor
(4) Open the exhaust shut-off valve and make its contacts on
(5) Dismantling and repair
(6) After inspection, disassemble and repair
Fault phenomenon 3: The compressor suddenly stops or stops frequently during operation
Cause analysis
(1) The suction pressure is lower than the setting value of the low-voltage relay, so that the contact jumps off and cuts off the power supply
(2) The exhaust pressure is too high, so that the high-voltage relay acts
(3) The temperature controller is adjusted too small
(4) The motor is overloaded, causing the thermal relay to operate or the fuse to blow
(5) Serious leakage of the valve plate, or leakage of the automatic oil return valve of the oil separator
(6) Ice plugging of thermal expansion valve
Exclusion Method
(1) After finding out the cause, eliminate the fault
(2) After finding out the cause, deduct 2 faults
(3) Expand the scope of control
(4) Eliminate overload faults
(5) According to the cause of the failure, dismantle and repair
(6) Remove the water from the system
Symptom 4: No cooling capacity
Cause analysis
(1) The filling agent in the temperature sensing package of the expansion valve leaks, so that the valve pin is closed
(2) The expansion valve is blocked
(3) The filter mesh is blocked
(4) The solenoid valve is damaged and cannot be opened
(5) The outlet valve of the condenser or liquid reservoir is not opened
(6) The paper pad on the upper part of the valve plate or the lower part of the cylinder liner is broken down or broken
(7) The compressor suction and exhaust valve are broken
(8) Almost all the refrigerant leaks
Exclusion Method
(1) Repair or replace the expansion valve
(2) Cleaning after disassembly
(3) Clean after disassembly
(4) Repair or replace the solenoid valve
(5) Open the outlet valve
(6) Replace the paper gasket after inspection
(7) Disassemble the cylinder head and replace the valve plate
(8) Find out the leakage, and add refrigerant after elimination
Fault phenomenon 5: The compressor is seriously frosted
Cause analysis
(1) The expansion valve is opened too much
(2) The refrigerant charge of the system is excessive
(3) The heat load is too small
(4) The thermodynamic expansion valve temperature bag is not tightly tied or the strapping position is incorrect
Exclusion Method
(1) Adjust the valve opening
(2) Discharge too much refrigerant
(3) Increase the heat load or reduce the cooling capacity
(4) Re-bundle as required
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