|
| |
TM5-4120-387-14
a.
Access
(1) Using hex head wrench, loosen Temperature control thermostat knob
setscrew.
(2) Remove knob.
(3) Using screwdriver and wrench, remove four screws and locknuts that
secure rear panel.
(4) Pull rear panel away from box as far as harness will allow.
b.
Inspection
(1) Check that leads are properly connected. (See wiring diagram, fig.
4-7.)
(2) Check that capillary line and sensing bulb are not damaged.
(3) Check Temperature control thermostat for signs of overheating or other
obvious damage.
Replace if damaged.
c.
Test
(1) Using multimeter, place probes on the red
(2) Turn Temperature control thermostat shaft
(3) Check continuity.
If temperature at sensi
there should be no continuity.
and blue terminals.
fully clockwise.
ng bulb is above 40°F (5°C),
(4) 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.
(5) Place multimeter probes on the red and yellow terminals.
(6) Turn Temperature control thermostat shaft fully counterclockwise.
(7) Check continuity.
If temperature at sensing bulb is below 90°F (32°C)
there should be no continuity.
(8) 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.
(9) Replace Temperature control thermostat if it fails any of the above
tests.
4-110
|
