
SSC-SVN008E-EN 13
Corrective Maintenance
CompressorInstallation
The compressor may have problems
mainly at two levels: mechanical or
electric. Inbothcases, the compressor
must bereplaced, but keepin mind that
this replacement is not enough.
It is always important to locate and
eliminatethecause(s)of thefailure(s).
Mechanic Breakdown
If the compressorhas no service valves,
transferthe refrigerantto anappropriate
cylinder, perform a pressurization test
(maximum 200 psig to protect low
pressureregulator),makenewvacuum,
refrigerant load and new start with all
readings.Correcttheinstallationtosolve
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,therefrigerant canremain
inthecircuit.
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
suctionanddischarge pipes;
1.4.Remove the compressor;
1.5.Installthe newcompressor
1.6. Install the electric circuitry and
pressureregulatortails;
1.7.Evacuatethecompressor;
1.8.Opencompressorvalves.
MotorBurnout
The motor burnout results in the
productionof acids anddepositionof 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 inliquid andsuction 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 itusingappropriate
equipment.
IMPORTANT
The follow-up ofa perfectevacuation
mustbe performed using proper
equipment,and never measured in
relation to evacuation time, butin
reference to negative pressure: 250
to 500 microns.
2.2.Remove the compressor;
2.3.Removethedryerfilter;
2.4.Installthe adequatefilterinthecom-
pressorsuctionlineandreplacethe one
inthe liquidline;
2.5. Install the new or recovered com-
pressor,evacuateandloadthe system;
2.6. Check contactors for cleaness.
Ifrequired, replacethem;
2.7.Starttheequipment andobserve its
operation;
2.8. Verify pressure loss through the
suction filter. If it exceedes the
manufacturer-recommended value,
replace the filter;
2.9.After24-houroperation,analyzeoil;
2.10. Change oil and filters every 48
hoursuntiloilis free of acidity;
2.11.Removethesuctionfilter.
When cleaning a circuit with two
compressors,replaceburnout compres-
sor oilandits pair.
Leakage tests with nitrogen
The leakage test should be performed
after the installation of interconnection
tubingof separatedunits,whenever the
liquidsight glass shows bubblingor after
reparis in the equipment refrigerating
circuit.
Use refrigerant as a test element to
detect leakage and dry nitrogen to
achievethetest pressure.
WARNING!
Never release gas into the environ-
ment; always use appropriate
equipment.
Evacuation
- Evacuationis requiredtoremovewater
steamandnon-condensablegases from
the system;
- Use rotary style highvacuumpump;
-Installthesetmanometer-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 closedfor5 minutes andthe vacuum
shouldnotexceed100microns.
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. Ifthis valve is not used,there
may be fatal consequences due to
explosion.