Carrier TRANSICOLD 69NT20-274, Операция и обслуживание

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4-3
4.5 REPLACING THE COMPRESSOR
(See Figure 4-2.)
WARNING
Make sure power to the unit is OFF and power
plug disconnected before replacing the
compressor.
1 2
3
4
5
6
7
8
9
10
11
12
13
14
1. Discharge Valve Flange
2. High Pressure Switch Connection
3. Low Pressure Connection
4. Suction Valve Flange
5. Motor End Cover
6. Serial/Model No. Plate
7. Sight Glass
8. Bottom Plate
9. Oil Drain Plug
10. Bearing Head
11. Oil Pump (See Figure 4-3)
12. Oil Fill Plug (Refer to paragraph 4.8.c.)
13. Cylinder Head
14. Valve Plate
Figure 4-2. Compressor --- Model 06DR
GEAR PUMP VANE PUMP
Figure 4-3. Oil 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.
NOTES
1. Check the compressor Serial/Model
Number plate for CFM displacement, refer to
Table 1-2.
2. The service replacement compressor is sold
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.)
4. A terminal block kit must be ordered as a
separate item when ordering replacement
compressor. Appropriate installation
instructions are included with kit.
5. Refer to Table 4-1 and Table 4-2,
for
applicable compressor wear limits and torque
values.
a. Remove the protective guard from lower section of
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 wiring from
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 high pressure switch (HPS) from
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.
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