TM 9-4110-256-14
4-30. REMOTE BULB THERMOSTAT S3 TESTING AND REPLACEMENT.
This task covers:
a. Testing
b. Removal
c. Installation
INITIAL SETUP
Materials/Parts:
Equipment Conditions:
Lock Washers (2)
Self Locking Nuts (4) (Thermostat)
disconnected.
Control panel cover open.
Self Locking Nuts (2) (Bracket)
Self Locking Nuts (2)
Self Locking Nut
General Safety Instructions:
Tie Down Straps
WARNING
Marker tags (2)
High voltage and exposed rotating parts are used in
the refrigeration unit. Personal injury can result if
Silicone RTV
power is connected.
(1)
Be sure power has been disconnected at the source and remove two bolts (1) and lock washers (2). Open
control box cover (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).
0
(6)
Immerse sensing bulb (12) into a temperature controlled bath at 32 F. 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)
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0
terminals 1 and 3 with thermostat setting at 24 F and at 40 F. Continuity should be indicated only when
the setting is at 240 F. If continuity was indicated at 400 F setting, replace thermostat.
(8)
If test did not indicate a failure, slip clamp (11) over sensing bulb (12).
(9)
Install clamps (11) and (14), bolt (10), and new self locking nut (9).
(10) Install sensing bulb bracket (8), two bolts (7), and new self locking nuts (6).
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