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 TM 5-4120-341-13
LOCATION/lTEM
REMARKS
ACTION
FRONT OF HOUSING
a.
Remove eight (8) screws securing return air
2. Return Air Grill
grilI to front panel.
b.
Partially remove return air grill from front
panel.
CAUTION
Carefully unwrap thermostat switch sensing bulb from expansion valve
sensing line. Use care to prevent damage to sensing bulb.
a.
Loosen setscrews and remove three (3) knobs.
3. Thermostat Switch
b.
Remove two (2) screws securing control panel
plate to front panel.
c.
Remove control panel plate.
d.
Tag and disconnect electrical leads from
thermostat switch.
e.
Remove two (2) screws securing thermostat
switch to front panel.
f.
Unwrap thermostat switch sensing bulb and
remove thermostat switch.
a.
4. Thermostat Switch
Tag and disconnect electrical leads from
thermostat switch.
b.
With the thermostat switch set below room
for Continuity across the thermostat switch
terminals (see Wiring Diagram, Appendix F).
c.
Verify that the resistance indicated is zero
ohms.
d.
Move thermostat switch setting to a position
above room temperture.
Verify that the resistance is infinity.
e.
f.
Replace thermostat switch if testing indicates
that it is defective.
FRONT OF HOUSING
a.
Connect electrical leads to thermostat switch
5. Thermostat Switch
and remove tags.
b.
Align holes in thermostat switch with holes in
front panel.
c.
Secure thermostat switch with two (2) screws.
d.
Carefully wrap thermostat switch sensing bulb
around expansion valve sensing line.
e.
f.
9.
4-58
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