Compressor - Emerson DataMate 3000 Series User Manual

50 Chapter 6 Maintenance

6.2.7 Compressor

The compressor failure is generally classified into two types:
1. Motor failure (such as the winding burnout, insulation failure, short-circuit
between coils and so on)
2. Mechanical failure (such as compressing failure, temperature switch failure and
others)
Compressing failure indicates low operation pressure. It can be confirmed if the
suction pressure and discharge pressure are balanced and the motor does not
rotate reversely.
The controller has powerful alarm and protection functions to ensure safe operation
of the compressor. The maintenance person should record the high pressure and
low pressure readings and find out the cause of an alarm or a protection during
periodical maintenance and inspection.
Note
Avoid touching or contacting the gas and oils with exposed skin. Wear long rubber gloves to
handle contaminated parts.
Check according to the following procedures before replacing the
compressor
1. Check if all fuses and circuit breakers are disconnected.
2. Check the status of the pressure switch.
3. Check Alarm History related to the compressor.
4. Check the compressor operation record.
5. Check the electrical function of the motor.
Note
System contains refrigerant. Recover refrigerant using standard recovery equipment before
maintenance.
Procedures to remove and replace the failed compressor:
1. Disconnect power
2. Attach suction and discharge gauges to access fittings.
3. Recover refrigerant using standard recovery procedures and equipment.
DataMate 3000 Series Air Conditioner User Manual