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TM-4120-387-14
c.
Heater Installation
(1) For Model 3770, install heater element into receptor. For Model 3873,
place heater onto compressor crankcase and tighten heater clamp screw,
(2) For Model 3770, install plug P3 in connector J3 on compressor junction
box.
(3) For Model 3770, slide bottom receiver clamp up to aline with through
hole in casing.
(See fig. 5-25.)
(4) For Model 3770, secure bottom receiver clamp to casing with screw and
lock washer.
(5) For Model 3770, tighten bottom receiver clamp.
(6) For Model 3873, install compressor. (See para. 5-21g.)
d.
Compressor replacement
Voltages used can kill.
Always disconnect power cord to air
conditioner before performing any internal maintenance.
Shutting unit off at its control panel does not disconnect
unit power.
Conduct an inspection of
compressor is removed.
maintenance actions.
(1) Raise the cabinet and pl
N O TE
the bottom panel each time the
Refer to paragraphs 6-2 and 6-3 for
ace it. on blocks at least four inches high. Be
sure the blocks do not obstruct the holes in the base through which the compressor
mounting shoulder screws must be removed.
(2) Discharge the refrigerant system per paragraph 5-6.
(3) Unwrap the insulation from the suction tube so that the joint on the
compressor is exposed.
(4) While purging the system with nitrogen, debraze the tubing. (See paras
5-7 and 5-8.)
(5) Using wrenches, remove four locknuts and flat washers from top of
mounting feet and four shoulder bolts, eight flat washers, and four rubber washers
from underneath side of unit.
(6) Slide compressor back approximately six inches to gain access to the
sensing bulb.
(7) Unwrap the insulation surrounding sensor bulb.
(8) Using screwdriver and wrench, remove two screws and nuts from bulb
clamps.
(9) Remove bulb and stow away from compressor tubing.
Change 3
5-51
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