TM 9-4110-254-14
4-49. THERMOMETER TESTING AND REPLACEMENT
This task covers:
a. Testing
b. Removal
c. Installation
INITIAL SETUP
Materials/Parts:
Equipment Conditions
Self Locking Nut
Refrigeration unit shut down (para 2-7) and power
12, Appendix G
disconnected
Self Locking Nuts (3)
Control box cover door raised and latched
8, Appendix G
Right side door open
Tie Down Straps
Cover panel removed (para 4-16).
24, Appendix E
Silicone RTV
General Safety Instructions
20, Appendix E
Lock Washers (3)
WARNING
1, Appendix G
High voltage and exposed rotating parts are
used in the refrigeration unit. Personal injury
can result if power is connected.
a. Testing
(1)
Be sure power has been disconnected at the source and remove two bolts (1), lock washers (2), flat
washers (3) and sensing bulb bracket (4). Discard lock washers
(2)
Remove self locking nut (5), lock washer (6), bolt (7), and sensing bulb bracket (4) Discard self locking nut
and lock washer.
(3)
Remove clamp (8)
(4)
Immerse sensing bulb (9) into a temperature controlled bath at 320 F (0C) 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 (10) Temperature indicated should be between 24F
(-4C) and 40F (4C) If temperature indicated is above or below this range, replace thermometer
(6)
If no failure was indicated, slip clamp (8) over sensing bulb (9).
(7)
Install clamps (8) and (11), bolt (7), new lock washer (6) and new self locking nut (5).
(8)
Install sensing bulb bracket (4), two flat washers (3), new lock washers (2), and bolts (1)
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