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 TM 5-4120-341-13
REMARKS
ACTION
LOCATION/lTEM
FRONT OF HOUSING
a.
Remove eight (8) screws securing return air
2. Return Air Grill
grill to front panel.
b.
Partially remove return air grill from front
panel.
a.
Loosen setscrews and remove three (3) knobs.
3. Selector Switch
Remove two (2) screws securing control panel
b.
plate to front panel.
c.
Remove control panel plate.
Tag and disconnect electrical leads from
d.
selector switch.
e.
Remove two (2) screws securing selector
switch to front panel.
f.
Remove selector switch.
a.
Tag and disconnect electrical leads from
4. Selector Switch
selector switch.
b.
Using an ohmmeter, measure resistance
between the related contacts at each switch
setting as follows (see Wiring Diagram,
(1) With selector switch in the OFF
position, resistance should be high.
(2) With selector switch in the FAN
position, high resistance should be
indicated at the compressor terminal and
low resistance should be indicated at the
fan terminal.
(3) With selector switch in the COOL
position, low resistance should be
indicated.
c.
Replace selector switch if testing indicates
that it is defective.
FRONT OF HOUSING
a.
Connect electrical leads to selector switch and
5. Selector Switch
remove tags.
Align holes in selector switch with holes in
b.
front panel.
c.
Secure selector switch with two (2) screws.
Align holes in control panel plate with holes
d.
in front panel.
e.
Secure control panel plate with two (2)
screws.
f.
Install three (3) knobs and tighten setscrews.
4-54
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