Trane CGAD020, Installation Operation & Maintenance

Page: 26 / 85

CGAD-SVN02C-EN 26
Installing a new Compressor
The compressor may present basically
two types of problems:
- Mechanical
- Electrical
In both cases the compressor should be
replaced; but remember that it is not
enough to simply put on a new
compressor. Always try to find and
eliminate what caused the defect.
a. Mechanical breakdown: If the
compressor does not have access valves
, transfer the refrigerant to an appropriate
cylinder and run the pressure test
(maximum of 200 psig to protect the low-
pressure switch), make a new vacuum,
charge refrigerant, and then start up again
with all the readings. Correct the
installation that may have damaged the
equipment, freeing it up for operation, and
always have a specialized company
monitoring it.
- If the compressor has access valves, the
refrigerant can be kept in the circuit, and
the following sequence should be
followed.
- Close the compressor's suction and
discharge valves.
- Open the nuts on the connections of the
compressor's valves and pigtails on the
pressure gauges
Operational
Procedures
CAUTION:
All the tests done on the pressure
regulator should be done with reliable
pressure gauges. These safety devices
are calibrated at the factory and sealed. If
violated, the warranty will be void.
!
- Turn off the compressor's electric circuit
- Remove the compressor
- Install the new or reconditioned
compressor
- Install the electric circuit and the pigtails of
the pressure gauges
- Evacuate the compressor
- Open the compressor valves
Motor burnout
Motor burnout implies in the formation of
acids and the deposit of oxides and waste
on parts of the circuit and so it is necessary
to replace the refrigerant and the oil and
clean the entire circuit by placing HH anti-
acid dryer filters in the suction and in the
liquid line. In this case, the cleaning should
be carried out in the following way:
- Reclaim all the refrigerant in a cylinder
and send it to be recycled by the
manufacturer or do your own recycling with
equipment specific for this.
- Remove the compressor.
- Remove the dryer filter.
- Install the adequate filter on the
compressor's suction line and change the
one on the liquid line.
- Install the new or reconditioned
compressor, then evacuate and charge the
system.
- Check the contactor. The contacts should
be clean or changed.
- Put the conditioner to work and monitor
its operation.
- Check the loss of pressure through the
suction filter. If the loss of pressure
exceeds that recommended by the
manufacturer, the filter should be changed.
- After 48 hours of operation, the oil should
be analyzed.
- Change the oil and filter every
48 hours until the oil is exempt of acidity.
- Remove the suction filter. When cleaning
one of the TWIN circuits (two
compressors), it is necessary to change
the oil of the compressor that burned out
and of its pair also.
NEVER RELEASE GAS INTO THE
ENVIRONMENT.
Always install a pressure regulator
at the hook-up for the testing
pressure. Set the control of the
regulator to 14 kgf /cm 2 (200 psig).
IMPORTANT
!