TM 9-4110-255-14
4-33. THERMOMETER TESTING AND REPLACEMENT.
This task covers:
a. Testing
b. Removal
c. Installation
INITIAL SETUP
Materials/Parts:
General Safety Instructions:
Lock Washers (2)
WARNING
1, Appendix G
Self Locking Nut
Exposed rotating parts are used in the
4, Appendix G
refrigeration unit. Personal injury can result if
Self Locking Nuts (3)
battery is connected.
6, Appendix G
Tie Down Straps
5, Appendix E
Silicone RTV
1, Appendix E
Equipment Conditions:
Refrigeration unit shut down (para 2-7) and battery
disconnected (para 4-35).
Control box cover door raised and latched.
Left side door open.
Evaporator cover panel removed (para 4-15).
a. Testing.
(1) Be sure battery has been disconnected then remove two bolts (1), lock washers (2), flat washers (3), and
sensing bulb bracket (4). Discard lock washers.
(2) Remove self locking nut (5), bolt (6), and sensing bulb bracket (4). Discard self locking nut.
(3) Remove clamp (7).
(4) Immerse sensing bulb (8) 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.
(5) Check temperature indicated on thermometer (9). Temperature indicated should be between 24 F and
40F (-4C and 4C). If temperature indicated is above or below this range, replace thermometer.
(6) If no failure was indicated, slip clamp (7) over sensing bulb (8).
(7) Install clamps (7) and (10), bolt (6), sensing bulb bracket (4), and new self locking nut (5).
(8) Install sensing bulb bracket (4), two bolts (1), new lock washers (2) and flat washers (3).
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