Removal And Replacement Of Compressor - Carrier 69NT40-561-019 Operation And Service Manual

7.4.1

Removal and Replacement of Compressor

a. Turn the unit ON and run it in full cool mode for 10 minutes.
If the compressor is not operational, front-seat the suction and discharge service valves and go to
step g. below.
b. Frontseat the manual liquid line valve and allow the unit to pull-down to 0.1 kg/cm
c. Turn the unit start-stop switch (ST) and unit circuit breaker (CB-1) OFF, and disconnect power to the unit.
d. Remove the compressor cover.
e. Frontseat the discharge and suction service valves.
f. Remove all remaining refrigerant from the compressor using a refrigerant recovery system.
g. Remove the compressor terminal cover, disconnect the ground wire and pull the cable plug from the
compressor terminals. Install the terminal cover back after removing the power cable.
Inspect the power cable (plug) terminals to en sure they are not deformed or have any signs of heat or
arcing. If any damage is noted, replace the power cable.
h. Remove the Rotalock fittings from the suction and discharge service connections, and uncouple the
unloader and economizer lines from the compressor.
i. Cut the dome temperature sensor wires. The replacement compressor comes with a dome temperature
sensor already assembled.
j. Remove and save the compressor base mounting bolts. Discard the 4 top resilient mounts and washers.
k. Remove (slide out) the old compressor from the unit.
l. Inspect compressor base plate for wear. Replace, if necessary.
m. Wire tie the compressor base plate to the compressor, and slide the new compressor into the unit.
Refer to Figure 7.5.
DO NOT add any oil to the replacement compressor. Replacement compressor is shipped with full oil
charge of 60 oz.
n. Cut and discard the wire ties used to hold the base plate to the compressor.
o. Place the new SST washers on each side of the resilient mounts, and the new Mylar washer on the bottom
of it as shown in Figure
p. Place the new Teflon seals at the compressor suction and discharge ports as well as the O-rings at the
unloader and economizer line connection ports. Hand tighten all four connections.
q. Torque the four base-mounting screws to 6.2 mkg (45 ft-lbs).
T-359
NOTE
NOTE
NOTE
7.5. Install the four base mounting bolts loosely.
7–8
2
(1 psig).