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TM 9-4110-257-14
4-29. REMOTE BUILB THERMOSTAT S2 TESTING AND REPLACEMENT.
This task covers: a. Testing b. Removal c. Installation
INITIAL SETUP
Materials/Parts:
Equipment Conditions:
Lock Washers (2)
Refrigeration unit shut down (para 2-7) and
1,Appendix G
battery disconnected (para 4-35).
Self Locking Nuts (4) (Thermostat)
Control panel cover door raised and latched.
8, Appendix G
Left side condenser door open.
Self Locking Nuts (2) (Bracket)
Evaporator coil guard removed (para 4-18).
8, Appendix G
Evaporator air outlet guard removed (para 4-17).
Self Locking Nuts (4) (Dummy Stowage Connector)
8, Appendix G
General Safety Instructions
Self Locking Nuts (2)
11, Appendix G
WARNING
Self Locking Nut
12, Appendix G
Exposed rotating parts are used in the
Tie Down Straps
refrigeration unit. Personal injury can result if
24, Appendix E
battery is connected.
Marker tags (2)
7, Appendix E
Silicone RTV
20, Appendix E
a.
Testing. (See Figure 1-4.)
(1) Be sure battery has been disconnected and remove two bolts (1) and lock washers (2). Open control panel
(3). Discard lock washers.
(2) Remove screw (4) and cover (5).
(3) Remove two self locking nuts (6), bolts (7), and sensing bulb bracket (8). Discard self locking nuts.
(4) Remove self locking nut (9), bolt (10), and sensing bulb bracket (8). Discard self locking nut.
(5) Remove clamp (11).
(6) Immerse sensing bulb (12) into a temperature controlled bath at 32° F (0° C). A bath at this temperature can
be made by putting the sensing bulb into a container of ice and covering with water. Ice must remain packed
around sensing bulb at all times during test.
(7) Using multimeter set to measure continuity, check remote bulb thermostat (13) continuity between terminals
1 and 3 with thermostat setting at 24°F and at 40°F (-4°C and 4°C ). Continuity should be indicated only
when the setting is at 24°F (-4°C). If continuity was indicated at 40°F (4°C) setting, replace thermostat.
(8) If no failure was indicated, slip clamp (11) over sensing bulb (12).
4-72
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