Carrier 69NT40-541-505, Operation And Service Manual, Page: 98 / 143

T-368 7–6
Figure 7.5 Compressor
1. Discharge Valve Flange
2. High Side Pressure Connection
3. Low Side Pressure Connection
4. Suction Valve Flange
5. Motor End Cover
6. Serial/Model No. Plate
7. Bottom Plate
8. Sight Glass
9. Oil Drain Plug
10. Oil Charging Valve
11. Bearing Head
12. Oil Pump
13. Oil Fill Plug
14. Cylinder Head
15. Valve Plate
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g. Remove high pressure switch (HPS) from com-
pressor and check operation of switch (refer to
Section 7.9.1 ).
h. Remove compressor mounting bolts from
mounting plate and install mounting plate on
replacement compressor.
i. Install replacement compressor terminal wiring
kit, following instructions included with kit.
j. Install high pressure switch on compressor.
k. Install compressor and mounting plate in unit.
l. Connect junction box(es) to compressor and
connect all wiring per wiring diagram. Install
junction box cover(s).
m. Install new gaskets on service valves.
n. Install mounting bolts in service valves and
torque to 2.77 to 4.15mkg (20-30ft/lb).
o. Attach two hoses (with hand valves near vac-
uum 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
hoses to pump.
p. Fully backseat (open) both suction and dis-
charge service valves.
q. Remove vacuum pump lines.
r. Start unit and check refrigerant charge (refer to
Section 7.7 ).
s. Check moisture-liquid indicator for wetness.
Change filter-drier if necessary (refer to Section
7.12 ).
t. Check compressor oil level per Section 7.8.6 .
Add oil if necessary.
7.8.2 Compressor Disassembly
WARNING
!
Before disassembly of any external com-
pressor component make sure to relieve
possible internal pressure by loosening
the bolts and tapping the component with
a soft hammer to break the seal.
WARNING
!
Removing the compressor motor press-
fit stator in the field is not recommended.
The rotor and stator are a matched pair
and should not be separated.
When disassembling compressor, matchmark parts so
they may be replaced in their same relative positions
(see Figure 7.5 ). Refer to Table 7–4 and Table 7–5 for
compressor wear limits and bolt torque values.
a. Place the compressor in a position where it will
be convenient to drain the oil. Remove the oil fill
plug (see Figure 7.5 ) to vent the crankcase.
Loosen the drain plug in bottom plate and allow
the oil to drain out slowly. Remove the plug
slowly to relieve any crankcase pressure. Some
units have a plug in the bottom center of the
crankcase, which may be removed for draining
the motor end more quickly.
Figure 7.6 Exploded View of Valve Plate
1. Cylinder Head Gasket
2. Discharge Valve Screw & Lockwasher
3. Discharge Valve Stop
4. Discharge Valve
5. Valve Plate
6. Valve Plate Assembly
7. Valve Plate Gasket
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JACK HERE
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