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TM 5-4120-287-15
(2) Loosen terminal board (TB2) lug screws 1, 2, and 3 (2, 3 and 4, fig. 3-9); and remove thermostat leads from
terminal board
(3) Remove the two thermostat hold down phillip screws (6) by turning counterclockwise; then remove the
thermostat (5) from the air conditioner frame.
b.
Cleaning, Inspection, and Replacement
(1) Wipe the thermostat, thermostat leads, and terminal board with a clean, dry cloth.
(2) Inspect the thermostat for cracks breaks, and distortion. Check for integrity of thermostat lead insulation.
Replace a defective thermostat.
c.
Installation.
(1) Install thermostat (5, fig. 3-9) using the two phillips head screws (6).
(2) Connect thermostat black, red, and white leads to terminal board TB2 connectors 1, 2, and 3 (4, 3, and 2, fig. 3-
9) respectively.
(3) Install thermostat access panel (para. 3-26c).
1
Terminal board TB-2
4
Black thermostat lead
7
Arbor nut plate (7)
2
White thermostat lead
5
Thermostat
3
Red thermostat lead
6
Phillips head bolt (2)
Figure 3-9. Thermostat replacement
Section IX. TEMPERATURE CONTROL SYSTEM
3-40. General
The temperature control system consists of the remote control box containing the air conditioning switch (para. 2-8a) and
temperature control variable resistor (para. 2-8a), current limiting resistor, cycling resistor, cycling capacitor, temperature
control relay and the temperature control thermostat.
3-19
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