Troubleshooting - comatec AQWL Installations- Und Wartungshandbuch

The table below lists the anomalies of operation of the unit, the relevant causes and the corrective measures. For anomalies of any other type or
not listed, contact one of authorised Service Centre for technical assistance.
Anomaly Cause
The unit continues
Insufficient charge of refrigerant.
to work, but without
cooling The dehydrating filter is clogged.
Ice on the suction line Wrong calibration of overheating.
Vibration of lines.
Whistler emitted by the thermostatic expansion
valve.
Excessive noise
Noisy compressor.
One or more gas or oil leaks in the circuit.
Mechanical failure of the compressor.
Low oil level in the
compressor
Anomaly of the oil heater of the compressor's
base.
Breaking of the electric circuit.
Intervention of the HP pressure switch.
The fuse of the control circuit is broken.
Loosened terminals.
One or both
compressors are not
Halt caused by thermal overload of the electric
working
circuit.
Wrong wiring.
The line voltage is too low.
Short-circuit of the compressor's motor.
Seized compressor.
Gas leak.
Activation of the LP
Insufficient charge.
alarm, stop of the unit
Failure of the pressure switch.
Failure of the pressure switch.
The delivery valve is partially closed.
Activation of the HP
alarm, stop of the unit
Substances with condensable gases in the
circuit.
The fan of the condenser is stopped.
The liquid line is too hot Insufficient charge.
The valve of the liquid line is partially closed.
Frosting of the liquid
line
The liquid filter is clogged.

10 - Troubleshooting

Operation
Refill.
Replace.
Increase overheating.
Check the charge.
Check the clamping brackets, if any.
Refill.
Check the dehydrating filter.
Seized bearings; replace the compressor.
Check that the compressor's locknuts are tightened.
Identify and remove leaks.
Request the intervention of a Service Centre.
Check the electric circuit and the resistor of the heater of the
motor base, and replace defective components.
Check the electric circuit and detect any ground dispersions and
short circuits. Check fuses.
Reset the pressure switch and the control panel and restart
the appliance. Identify and remove the cause that enabled the
pressure switch.
Check for ground dispersions and short circuits. Replace fuses.
Check and tighten.
Check the operation of check and safety devices. Identify and
remove the cause.
Check wiring of check and safety devices.
Check voltage. If problems regard the system, solve them. If
they are caused by the distribution network, inform the Energy
Distributor.
Check the continuity of the winding.
Replace the compressor.
Identify and remove the leak.
Refill.
Replace the pressure switch.
Check the operation of the pressure switch, replace it if
defective.
Open the valve and replace it, if faulty.
Drain the circuit.
Check cables and motor. If defective, repair or replace.
Identify and remove the cause of the loss of charge and refill.
Check that valves are open.
Replace the cartridge or the filter.
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