58
Troubleshooting
The suction pressure is too high
Possible Cause
Handling Method
(1) The cooling load is too high (i.e. the water supply temperature is
high).
See the section E.
(2) The expansion valve excessively supplies liquid (i.e. the
superheating capacity is too low, and the liquid overflows to the
compressor).
Adjust the superheat setting, and inspect
whether the temperature sensor is installed in
the gas pipe.
(3) The suction valve is broken (i.e. the compressor noise is high).
Replace the compressor.
The exhaust pressure is too low
Possible Cause
Handling Method
(1) The refrigerant is charged insufficiently (i.e. the superheating
capacity is high, the sub-cooling capacity is low, and there are bubbles
in the window).
Find out and repair the leakage point, and
recharge the refrigerant.
(2) The exhaust valve of the compressor is broken or leaks air.
Replace the compressor.
(3) The low pressure switch is poor.
Replace the poor control element.
(4) Operate below the minimum operating environment temperature.
Provide the proper exhaust pressure control
or ambient temperature locking switch.
The exhaust pressure is too high
Possible Cause
Handling Method
(1) The condensing air is too little or too hot, and the air flow is blocked.
Clear the coil, and inspect whether the fan
and the motor are normal.
(2) There is air or noncondensing gas in the system (i.e. the condenser
is unusually hot).
Recharge the refrigerant after the system is
vacuumized.
(3) The refrigerant is charged excessively (the sub-cooling capacity
is high, the superheating capacity is low, and the suction pressure is
high).
Recycle the excessive refrigerant.
(4) The system load is excessively high.
Reduce the load.
(5) The condensing fan or the fan pressure is poorly controlled (i.e.
certain fan is faulty, and the condenser pressure is too high).
Repair or replace the switch.
The unit cannot run the heating function (limited to CXAJ)
Possible Cause
Handling Method
(1) The control circuit is wrong or poor.
Inspect the control circuit.
(2) The four-way valve is faulty.
Replace the four-way valve.
