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TM 5-4120-270-15
Key to fig. 3-18:
9
Nut, self-locking,
17
Nut, self-locking, #8-32
26 Screw, hex hd, 1/428 x
1
Screw, drive
#1032
18
Washer, flat
8 in.
2
Plate, instruction
10
Washer, spring, 5/8 in.
19
Damper assembly
27 Washer, flat, 1/4 in
8
Screw, set, hex skt,
11
Washer, flat
20
Box assembly
28 Nut, self-locking, 1/4-28
#10-32 x 3/8 in.
12
Pin, locking
21
Grommet
29 Bracket, support
4
Knob
13
Worm gear
22
Bracket, support
5
Rod, linkage, long
14
Joint, ball
23
Screw, machine, #10432
6
Spacer, 6/8 in.
15
Rod, linkage, short
x 8/4 in.
7
Washer, spring, 5/8 in. 16
Screw, rd hd, # 8-32
24
Washer, flat, #10
8
Worm gear assembly
x 5/8
25
Nut, self-locking, #10-32
Figure 3-13. Damper door control, exploded view.
Section VIII. ELECTRICAL SYSTEM AND FAN BLOWER MOTORS
3-33.
General
The electrical system (fig. 1-6) consists of the
compressor, fan motors, contactors, solenoid valves,
selector switch, temperature control thermostat fuses,
circuit breaker, heaters, heater high temperature cutout,
high and low pressure cutouts, transformer, RFI filters,
time delay re- lay and all internal wiring. An internal
compressor overload protector and a manual reset
circuit
breaker prevent the compressor from being damaged by
electrical overload. The compressor heater thermostat
cuts off the power of the compressor heater when the
compressor reaches safe operating temperature and
also activates the heater when required. Both
evaporator fans are driven by the blower motor which
has integral overload protection. The evaporator heater
cutout prevents overheating when the unit is operating
on the heating cycle.
3-15
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