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TM 9-4110-257-14
4-33.
THERMOMETER TESTING AND REPLACEMENT.
This task covers:
a.
Testing
b.
Removal
c.
Installation
INITIAL SETUP:
Materials/Parts:
General Safety Instructions:
Self Locking Nuts (3)
WARNING
8, Appendix G
Self Locking Nuts (2)
Self Locking Nuts (2)
Exposed rotating parts are used in the
S11, Appendix G N
refrigeration unit. Personal injury can result if
battery is connected.
12, Appendix G
Tie Down Straps
24, Appendix E
Silicone RTV
20, Appendix E
Equipment Conditions:
Refrigeration unit shut down (para 2-7) and battery
disconnected (para 4-35).
Control panel cover door raised and latched.
Left side condenser door open.
Evaporator coil guard removed (para 4-18).
Evaporator air outlet guard removed (para 4-17).
a.
Testing.
(1)
Be sure battery has been disconnected and remove two self locking nuts (1), bolts (2), and
sensing bulb bracket (3). Discard self locking nuts.
(2)
Remove self locking nut (4), bolt (5), and sensing bulb bracket (3). Discard self locking nut.
(3)
Remove clamp (6).
(4)
Immerse sensing bulb (7) 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 (8). Temperature indicated should be between 24° F
and 40° F (-4° C and 4° C). If temperature indicated is above or below this range, replace
thermometer.
(6)
If no failure was indicated, slip clamp (6) over sensing bulb (7).
(7)
Install clamps (6) and (9), bolt (5), sensing bulb bracket (3), and new self locking nut (4).
(8)
Install sensing bulb bracket (3), two bolts (2), and new self locking nuts (1).
4-83
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