6-14
T-294-01
7. Install the oil suction screen, the oil suction screen
hold down plate and the bottom plate.
Figure 6-17. Compressor Oil Pump End View
6.11 COMPRESSOR 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. Check the front oil sight glass on the compressor to
ensure that no foaming of the oil is present after 20
minutes of operation. If the oil is foaming
excessively after 20 minutes of operation, check the
refrigerant system for flood-back of liquid
refrigerant. Correct this situation before performing
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,
follow step d in this section. If the level is below the
bottom of the sight glass, add oil to the compressor
following step b below.
b. Adding Oil with Compressor in System
In an emergency where an oil pump is not 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 manifold
to the compressor liquid line process tube (refer to
sections 6.3 and 6.4), and immerse the common
connection of the gauge manifold in an open container
of refrigeration oil. Crack the manifold gauge valve to
vent a small amount of refrigerant through the common
connection and the oil to purge the lines of air. Close the
gauge manifold valve.
With the unit running, SLOWLY frontseat the manifold
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 Service Replacement Compressor
NOTES
S
The correct oil charge is 3.6 liters (7.6 U.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
compressors have the oil plug located on the crankcase,
at the right or left side of the oil pump.
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