Replacing The Compressor; Oil Pump - Carrier TRANSICOLD 69NT20-274 Operation And Service

4.5 REPLACING THE COMPRESSOR

(See Figure 4-2.)
Make sure power to the unit is OFF and power
plug
compressor.
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11
10
9
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
Figure 4-2. Compressor --- Model 06DR
VANE PUMP
There are two types of oil pumps; vane and gear.
Force-feed lubrication of the compressor is accomplished
by a oil pump driven directly from the compressor
crankshaft. Refrigeration oil is drawn from the
compressor crankcase through the oil filter screen and
pick up tube to the oil pump located in the bearing head
assembly. The crankshaft is drilled to enable the pump to
supply oil to the main bearings, connecting rod bearings,
and the shaft seal.
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WARNING
disconnected before replacing
1 2
3
7
8
Discharge Valve Flange
High Pressure Switch Connection
Low Pressure Connection
Suction Valve Flange
Motor End Cover
Serial/Model No. Plate
Sight Glass
Bottom Plate
Oil Drain Plug
Bearing Head
Oil Pump (See Figure 4-3)
Oil Fill Plug (Refer to paragraph 4.8.c.)
Cylinder Head
Valve Plate
GEAR PUMP
Figure 4-3. Oil Pump
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1. Check
Number plate for CFM displacement, refer to
Table 1-2.
2. The service replacement compressor is sold
the
without shutoff valves (but with valve pads), and
without terminal box and cover. Customer
should retain the original terminal box, cover,
and high pressure switch for use on replacement
compressor.
3. Check oil level in service replacement
compressor. If none, add 4.0 liters (8.5 U.S.
pints). (Refer to sections 1.3.b. and 4.8.)
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4. A terminal block kit must be ordered as a
separate item when ordering replacement
compressor.
instructions are included with kit.
5. Refer to Table 4-1 and Table 4-2,
applicable compressor wear limits and torque
5
values.
a. Remove the protective guard from lower section of
6
the unit.
b. If the compressor is inoperative and the unit still has
refrigerant pressure. Remove refrigerant. (Refer to
section 4.1)
c. Disconnect wiring in the compressor junction box
after identifying same. Disconnect
compressor terminals and remove compressor junction
box.
d. Remove bolts from service valve flanges.
e. Remove compressor plate mounting bolts.
f. Remove compressor and mounting plate. The
compressor weighs approximately 118 kg (260 pounds).
g. Remove
compressor and check operation of switch (refer to
section 4.11.2).
h. Remove compressor mounting bolts from mounting
plate and install mounting plate on replacement
compressor.
i. Install replacement terminal block kit (following
instructions included with kit).
j. Install high pressure switch on compressor.
k. Install compressor and mounting plate in unit.
l. Install junction box to compressor and connect all
wiring per wiring diagram and then install junction box
cover.
m. Install new gaskets on service valves.
n. Install mounting bolts in service valves and torque to
a value of 2.77 to 4.15 mkg (20-30 ft/lb).
o. Change filter-drier. (Refer to section 4.10)
p. Attach two lines (with hand valves near vacuum
pump) to the suction and discharge service valves.
Dehydrate and evacuate compressor to 500 microns (75.9
cm HG vacuum = 29.90 inches Hg vacuum). Turn off
valves on both lines to pump.
4-3
NOTES
the compressor Serial/Model
Appropriate installation
high pressure switch (HPS)
for
wiring from
from