TM 9-4120-399-14
4-43. CONTROL MODULE. - Continued.
b. Disassemble.
(1) Remove set screw (12) and knob (13) from mode select switch (14).
(2) Remove set screw (15) and knob (16) from temperature control switch (17).
(3) Remove nut (18) and lock washer (19) from mode select switch (14).
(4) Remove four screws (20), four flat washers (21), four lock nuts (22), and remove
cover (23) from control module (2).
(5) Remove four screws (24), four lock nuts (25), and temperature control switch (17)
from control module cover (23).
(6) Tag and disconnect all wires from mode select switch (14) and temperature control
switch (17).
(7) Remove ground screw (26), nut (27), flat washer (28), flat washer (29), and jamb nut
(30).
(8) Remove four screws (31), four lock nuts (32), and J8 connector (1) from control
module (2).
C. Test.
(1) Temperature Select Switch.
(a) Using multimeter, place probes on the red and blue terminals.
(b) Turn temperature control thermostat shaft fully clockwise.
(c) Check continuity.
If temperature at sensing bulb is above 40 F (5 C), there
should be no continuity.
(d) Slowly turn shaft counterclockwise until continuity is indicated. Turn shaft back
and forth slightly to check that switch contacts open and close on a very narrow band.
(e) Place multimeter probes on the red and yellow terminals.
(f) Turn temperature control thermostat shaft fully counterclockwise.
If temperature at sensing bulb is below 90 F (32 C) there
(g) Chenk continuity.
should be no continuity.
(h) Slowly turn shaft clockwise until continuity is indicated. Turn shaft back and
forth slightly to check that switch contacts open and close on a very narrow band.
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