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TM 54120-287-15
1 Cover
11 Screw
21 Locking ring washer
2 Gasket
12 Rheostat, 5000 ohms (R3)
22 Bushing seal
3 Screw (14)
13 Nut
23 Nut
4 Plate nut (14) 14
Locking ring washer
24 Screw
5 Rivet (28)
15 Mounting seal
25 Washer
6 Electrical connector (J103)
16 Knob
26 Terminal lug
7 Nylon plug (6)
17 Screw
27 Switch identification plate
8 Screw (4)
18 Switch (S2)
28 Box
9 Nut (4)
19 Nut
10 Knob
20 Lockwasher
Figure 6-1-Continued.
b.
Repair and Inspection.
(1)
Using a light stream of clean, dry
compressed air remove all dirt and dust from
remote control box.
(2)
Replace defective parts with new
parts.
Section II.
SENSING SWITCHES AND SOLENOID VALVE COIL
6-5.
General
Note. Disconnect air conditioner from power source
before performing any maintenance or inspection of
electrical system, other than operation tests. The
operating voltage of this air conditioner is dangerous;
severe, possibly fatal shock may result from coming in
contact with any part of the electrical system.
The sensing switches and solenoid valve are
located throughout the air conditioner unit as
shown in fig. 6-2. The sensing switches and
solenoid valve control the operating parame-
ters and operation of the air conditioner. The
following are discussed:
a.
Condenser fan discharge door micro
switch, S101.
b.
Low ambient switch, S102.
c.
high-low pressure switch, S103.
d.
Heater temperature switch, S104; ther-
mostat, S105.
e.
Solenoid valve oil, L101.
6-6.
Sensing Switches and Solenoid Valve
Coil
a.
Condenser Fan Discharge Door Micro-
switch S101. Using a multimeter check
condenser fan discharge door microswitch,
S101 as follows:
(1)
Connect multimeter test leads to
plug P108 terminals M and L.
6-3
(3)
Recheck remote control box in ace
cordance with paragraph 63.
c.
Reassembly. Reassemble remote control
box assembly in reverse of numerical sequence
as illustrated in figure 6-1.
(2)
Open the condenser fan discharge
door and check for continuity between P108
terminals M and L.
(3)
Depress the microswitch operator
and check for an open circuit between P108
terminals M and L.
(4)
If the condenser fan discharge door
switch does not make and break as indicated
in a (2) and (3) of this paragraph, the switch
is defective and must be replaced.
(5)
Repeat step a (3) of this paragraph,
closing the condenser door to depress the
microswitch. If the microswitch does not open
when depressed by the door adjust switch
position.
b.
Low Ambient Switch (S102). Using a
multimeter check low ambient switch S102 as
follows:
(1)
Remove wires 109 and 111 from
terminal board TB1 (fig. 6-2); and connect
multimeter test leads to wires 109 and 111.
(2)
Check to determine that low ambient
switch S102 is closed when ambient tempera-
ture is 40 + 50F or below.
(3)
Check to determine that low ambient
switch S102 is open when ambient tempera-
ture is 50 + 56F or above.
(4)
Replace low ambient switch S102 if
criteria established in steps b (2) and (3) of
this paragraph are not met.
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