Trane TRCE050 1C, Установка, эксплуатация и обслуживание

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SSC-SVN008E-EN 13
Corrective Maintenance
Compressor Installation
The compressor may have problems
mainly at two levels: mechanical or
electric. In both cases, the compressor
must be replaced, but keep in mind that
this
replacement is not enough.
It is always important to locate and
eliminate the cause(s) of the failure(s).
Mechanic Breakdown
If the compressor has no service valves,
transfer the refrigerant to an appropriate
cylinder, perform a pressurization test
(maximum 200 psig to protect low
pressure regulator), make new vacuum,
refrigerant load and new start with all
readings. Correct the installation to solve
any problems that have affected the
equipment,
releasing it to normal
operation and always perform follow-up
useing the services of a qualified
company. In case the compressor has
service valves, the refrigerant can remain
in the circuit.
1.1. Turn the compressor electric
circuitry off and remove electric cables
(mark them);
1.2. Close compressor suction and
discharge valves;
1.3. Remove the welding in the
connections of the compressor to
suction and discharge pipes;
1.4. Remove the compressor;
1.5. Install the new compressor
1.6. Install the electric circuitry and
pressure regulator tails;
1.7. Evacuate the compressor;
1.8. Open compressor valves.
Motor Burnout
The motor burnout results in the
production of acids and deposition of oxi-
des and sludge in parts of the circuitry.
Thus, it is necessary to replace the
refrigerant and the oil, as well as to
clean all circuit and place HH antiacid
dryer filters in liquid and suction lines. In
this case, cleaning should proceed as
follows:
2.1. Collect all refrigerant in a cylinder
and send it to the manufacturer for
recycling, or recycle it using appropriate
equipment.
IMPORTANT
The follow-up of a perfect evacuation
must be performed using proper
equipment, and never measured in
relation to evacuation time, but in
reference to negative pressure: 250
to 500 microns.
2.2. Remove the compressor;
2.3. Remove the dryer filter;
2.4. Install the adequate filter in the com-
pressor suction line and replace the one
in the liquid line;
2.5. Install the new or recovered com-
pressor, evacuate and load the system;
2.6. Check contactors for cleaness.
If required, replace them;
2.7. Start the equipment and observe its
operation;
2.8. Verify pressure loss through the
suction filter.
If it exceedes the
manufacturer-recommended value,
replace the filter;
2.9. After 24-hour operation, analyze oil;
2.10. Change oil and filters every 48
hours until oil is free of acidity;
2.11. Remove the suction filter.
When cleaning a circuit with two
compressors, replace burnout compres-
sor oil and its pair.
Leakage tests with nitrogen
The leakage test should be performed
after the installation of interconnection
tubing of separated units, whenever the
liquid sight glass shows bubbling or after
reparis in the equipment refrigerating
circuit.
Use refrigerant as a test element to
detect leakage and dry nitrogen to
achieve the test pressure.
WARNING!
Never release gas into the environ-
ment; always use appropriate
equipment.
Evacuation
- Evacuation is required to remove water
steam and non-condensable gases from
the system;
- Use rotary style high vacuum pump;
- Install the set manometer-manifold.
- A vaccum of at least one hour is
recommended to perform the first
reading.
The evacuation is only
completed when the final vacuum is
between 250 and 500 microns. As a
release test, the pump register should
be closed for 5 minutes and the vacuum
should not exceed 100 microns.
WARNING!
Under no circumstances use oxygen
or acetylene instead of dry nitrogen to
test leakage. Undue use of such
gases may have fatal consequences,
as explosions, chemical reactions or
other reactions can occur.
WARNING!
Always use pressure regulator valve
in the dry nitrogen cylinder to test
leakage. If this valve is not used, there
may be fatal consequences due to
explosion.