8
−
22
62-11389
WARNING
Do not unscrew replacement compressor
lifting eyelet/blankoff plate mounting
capscrews all the way before breaking seal.
Entrapped pressure could result in injury.
i. Loosen the suction and discharge lifting eyelet/
blankoff plate mounting bolts. Tap the center of the
blankoff plates to break the seal and then remove
bolts, plates and gaskets.
j. If required add oil to the replacement compressor.
Add only 7.0 pints (3.3 liters) of oil when first adding oil
to the compressor. This procedure is designed to
compensate for excess oil that may have migrated
with refrigerant to other parts of the system during
unit operation.
k. Install components removed in step h. Install blankoff
plates and plugs in original compressor for shipment.
l. Remove any remaining old gasket material from the
discharge and suction service valve sealing surfaces.
m. Secure junction box to compressor.
n. Install compressor in unit. See Figure 8
−
19 for
mounting bolt torque information.
o. Connect all wiring per wiring schematic. Install junc-
tion box cover.
p. Install new gaskets and mounting bolts in service
valves. Torque discharge service valve mounting
bolts 20 to 30 ft lbs (27 to 40.7 Nm). Torque suction
service valve mounting bolts 55 to 80 ft lbs (74 to 108
Nm).
q. Leak check and evacuate the compressor. Refer to
Section 8.6.3 and Section 8.6.4.
8.7.3 Cylinder Head and Valve Plate Service
a. Pumpdown the compressor. (Refer to Section 8.6.2.)
b. Ensure the unit will not start automatically by dis-
abling any two way communication and placing the
Main Power switch in the OFF position. Disconnect
the high voltage source and lockout/tagout the re-
ceptacle.
WARNING
Do not unscrew cylinder head mounting
capscrews all the way before breaking seal.
Entrapped pressure could result in injury.
c. Loosen cylinder head capscrews. Tap the head lightly
with a wooden or lead mallet to break the seal and re-
lieve any remaining pressure. Be careful not to drop
the head or damage the gasket sealing surface.
Remove cylinder head capscrews and gasket. (See
Figure 8
−
20)
d. If removing the center head, remove the discharge
valve mounting hardware.
e. If required, free the valve plates from the cylinder
deck by using the discharge valve capscrews, without
washers, as jackscrews through the outermost
tapped holes in the valve plate after the valve stops
and valves have been removed. Remove the valve
plate gasket.
7
12
1
2
3
8
9
10
11
4
5
6
6
11
12
10
8
7
5
4
Typical Arrangement - Center Head Shown
1. Capscrew
2. Cylinder Head
3. Cylinder Head Gasket
4. Capscrew
5. Lockwasher
6. Discharge Valve Backer
7. Discharge Valve
8. Valve Plate
9. Valve Plate Gasket
10. Suction Valve
11. Suction Valve Spring
12. Dowel Pin
Figure 8
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20 Cylinder Head & Valve Plate