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TM5-4120-387-14
Voltages can kill.
Always disconnect power cord to air
conditioner before performing any internal maintenance.
Shutting unit off at its control panel does not disconnect
unit power.
a.
Access
(1) Using screwdriver, remove four screws in pressure switch nameplate that
secure switch enclosure.
(2) Carefully pull switch enclosure far enough from unit to gain access to
attachment screws.
(3) Using screwdriver, remove two screws and lockwashers from switch.
(4) Carefully pull switch from box far enough to gain access to terminals.
b.
Inspection/Test
(1) Check that wire leads and terminal attachment screws are in place.
Tighten if loose.
Replace if missing.
(2) Check that capillary line is not kinked, mashed or broken. Replace
switch if capillary line is damaged.
NOTE
Check that refrigerant line is properly charged. (See
para 5-12.)
(3) Press and release the reset button to be sure that switch is not
tripped.
(4) Use a continuity tester or multimeter to check for continuity between
terminals 1 and 2 on switch.
If there is continuity, the switch is properly
closed.
If no continuity is found, switch must be replaced.
c.
Removal
(1) Discharge the refrigerant per paragraph 5-6.
(2) Remove evaporator fan. (See para 4-58.)
(3) Remove condenser fan. (See para 4-59.)
(4) Remove evaporator and condenser fan motor. (See para 4-60.)
(5) Tag and disconnect wire leads from switch.
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