Service manual

6-14T-294-01
7. Install the oil suction screen, the oil s uction screen
hold down plate and the bottom plate.
Figure 6-17. Compressor Oil Pump End View
6.11COMPRESSOR OIL LEVEL
CAUTION
Use only Carrier Transicold approved
Polyol Ester Oil (POE) -- Castrol-Icematic
SW20 compressor oil with R-134a. Buy in
quantities of one quart or smaller. When
using this hygroscopic oil, immediately
reseal. Do not leave container of oil open or
contamination will occur.
a. Checking the Oil Level in the Compressor
1. Operate the unit in cooling mode for at least 20
minutes.
2. Checkthefrontoilsight glasson thecompressorto
ensurethat nofoaming of theoil i s present after20
minutes of operation. If the oil is foaming
excessivelyafter20minutesofoperation,checkthe
refrigerant system for flood-back of liquid
refrigerant.Correctthissituationbeforeperforming
step 6.11.a.3.
3. Turn unit off to check the oil level. The correct oil
level range should be between the bottom to
one-eighth level of the sight glass. If the level is
above one-eighth, oil must be removed from the
compressor. To remove oil from the compressor,
followstepdinthissection.Ifthelevelisbelowthe
bottom ofthesight glass, add oilto thecompressor
following step b below.
b. Adding Oil with Compressor in System
Inanemergencywhereanoil pump isnot available, oil
may be drawn into the compressor through the liquid
line process tube.
CAUTION
Extreme care must be taken to ensure the
manifold common connection remains
immersed in oil at all times. Otherwise air
and moisture will be drawn into the
compressor.
Connect the suction connection of the gauge m anifold
to the compressor liquid line process tube (refer to
sections 6.3 and 6. 4), and im merse t he common
connection of the gauge manifold in an open container
of refrigeration oil. Crack the manifold gauge valve to
ventasmallamount ofrefrigerantthroughthecommon
connectionandtheoiltopurgethelinesofair.Closethe
gauge manifold valve.
Withtheunitrunning,S LOWLYfrontseatthemanifold
liquid hand valve and induce a vacuum in the
compressor crankcase. Oil will flow through the liquid
line process tube into the compressor. Add oil as
necessary.
Run unit for 20 minutes in cooling mode. Check oil
level at the compressor sight glass.
c. Adding Oil to ServiceReplacementCompressor
NOTES
S Thecorrectoilchargeis3.6liters(7.6U.S.
pints).
S Service replacement compressors are
shipped without oil.
S When first adding oil to the compressor,
add only three liters (6.3 pints) to the
compressor. Run the unit for 20 minutes in
cooling mode. Check the oil level in the
compressor sight glass. Add oil as necessary.
This procedure is designed to compensate for
excess oil that may have migrated with
refrigerant to other parts of the system during
unit operation.
If compressor is without oil:
If oil is present in the compressor, ensure that it is the
correct oil. Add oil (refer to sections 2.2 and 6. 11)
through the oil fill plug. (See Figure 6-6.) Some
compressorshavetheoilplug locatedon thecrankcase,
at the right or left side of the oil pump.