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 TM 5-4120-374-13
4-22. SELECTOR SWITCH (CONT)
REMARKS
ACTION
LOCATION/lTEM
FRONT OF HOUSING
a. Remove eight (8) screws securing return air grill to front panel.
2.
Return
Air
Grill
b. Partially remove return air grill from front panel.
3. Selector Switch
a. Loosen setscrews and remove three (3) knobs.
b. Remove two (2) screws securing control panel plate to front
panel.
c. Remove control panel plate.
d. Tag and disconnect electrical leads from selector switch.
e. Remove two (2) screws securing selector switch to front panel.
f. Remove selector switch.
4. Selector Switch
a. Tag and disconnect electrical leads from 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.
5. Selector Switch
a.
Connect electrical leads to selector switch and remove tags.
b.
Align holes in selector switch with holes in front panel.
c.
Secure selector switch with two (2) screws.
d.
Align holes in control panel plate with holes in front panel.
e.
Secure control panel plate with two (2) screws.
f.
Install three (3) knobs and tighten setscrews.
a.
Align holes in return air grill with holes in front panel.
6. Return Air Grill
b.
Secure return air grill to front panel with eight (8) screws.
c.
Connect electrical leads to selector switch and remove tags.
d.
Align holes in selector switch with holes in front panel.
e.
Secure selector switch with two (2) screws.
f.
Align holes in control panel plate with holes in front panel.
g.
Secure control panel plate with two (2) screws.
h.
Install three (3) knobs and tighten setscrews.
4-42
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