Compressor Oil Level - Carrier 69NT40--541--200 TO 299 Operation And Service

b. Install the pump end thrust washer on the two dowel
pins located on the bearing head. (See Figure 6-8.)
CAUTION
Ensure that thrust washer does not fall off
dowel pins while installing oil pump.
CAUTION
The set screw on the crankshaft must be
removed for this type of oil pump.
c. Install the bearing head assembly with a new gasket
on the compressor crankshaft. Carefully push oil
pump on by hand, ensuring that the thrust washer re-
mains on the dowel pins. The tang on the end of the
drive engages the slot in the crankshaft, and the oil
inlet port on the pump is aligned with the oil pickup
tube in the crankcase. The pump should mount flush
with the crankcase and should be oriented with the oil
pick up tube and oil inlet port aligned as shown in
Figure 6-8.
d. Align the gasket and install the eight capscrews in the
mounting flange. Refer to Table 6-8 for applicable
torque values.
e. Install matching connecting rod caps Be sure rod is
not bound and crankshaft will turn correctly as each
set of rod bolts is torqued.
f. Be sure key fits properly when installng rotor on shaft
Screw on equalizer tube and lock screw assembly
with lock washer and bend over tabs of lock washer.
Assemble suction strainer to motor and cover and
bolt cover to crankcase. Assemble valve plates and
gaskets. Assemble cylinder heads and gaskets. Turn
the shaft by hand to see that it moves freely.
g. Install the oil suction screen, the oil suction screen
hold down plate and the bottom plate.

6.8.6 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 min-
utes.
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 the following step.
T--317
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.
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 com-
pressor.
Connect the suction connection of the gauge manifold to
the compressor liquid line process tube 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
The correct oil charge is 3.6 liters (7.6 U.S.
pints).
Service replacement compressors are shipped
without oil.
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 through the oil fill plug. Some
compressors have the oil plug located on the crankcase,
at the right or left side of the oil pump.
6-10
CAUTION
NOTES