TM 9-4110-256-14
4-31. THERMOMETER TESTING AND REPLACEMENT.
This task covers:
a. Testing
b. Removal
c. Installation
INITIAL SETUP
Equipment Conditions:
General Safety Instructions:
disconnected.
WARNING
Control panel cover open.
High voltage and exposed rotating parts are used in
the refrigeration unit. Personal injury can result if
power is connected..
Materials/Parts:
Self Locking Nuts (3)
Self Locking Nuts (2)
Self Locking Nut
Tie Down Straps
Silicone RTV
a. Testing.
(1)
Be sure power has been disconnected at the source 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 (6). Discard self locking nut.
(3)
Remove clamp (6).
Immerse sensing bulb (7) into a temperature controlled bath at 320 F. A bath at this temperature can be
(4)
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 24F and
40F. If temperature indicated is above or below this range, replace thermometer.
(6)
If test did not indicate a failure, slip clamp (6) over sensing bulb (7).
(7)
Install clamps (6) and (9), bolt (5), and new self locking nut (4).
(8)
Install sensing bulb bracket (3), two bolts (2), and new self locking nuts (1).
4-65