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 TM9-4120-423-14&P
INSPECTION OF INSTALLED ITEMS
WARNING
Disconnect input power to the air conditioner before performing any maintenance to the
electrical system. Voltages used can be lethal. Shutting the unit off at the control module
does not disconnect power to the various components of the air conditioner.
NOTE
Test switch when the temperature is below 100Ε F (38Ε C).
1
Tag leads, using screwdriver, remove four screws that hold leads to switch. (There are two
switches.)
2
Test for continuity between switch terminals 1 and 2 and between terminals 3 and 4. If none,
switch should be replaced.
NOTE
Switch contacts should open at 185-190Ε F (85-88Ε C) and close when temperature
drops to 140-160Ε F (60-71Ε C).
3
Check terminal board for loose or corroded terminals, cracks, and obvious damage. Replace if
terminals are corroded or if terminal board is cracked or broken.
4
Check marker strip for general condition. Replace if it is cracked, broken, or you cannot read the
numbers.
5
Check terminal board support for cracks and loose or damaged plate nuts or rivets. Replace the
support if it is cracked or broken. Replace the rivets if they are loose. Replace the plate nut if it
is damaged or missing.
0020 00-2
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