TM 9-4120-398-14
This task covers:
a. Test
b. Replacement
INITIAL SETUP
Tools
Equiment Condition
Tool kit, refrigeration SVC
Power OFF
Evaporator access panel removed
General Safty Instructions
Thermostat terminal box cover removed
WARNING
Voltages used 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. Test.
NOTE
Upon sensing a temperature exceeding 155 F, S4 opens, de-energizing the air conditioner as described
in paragraph 1-13. When the temperature sensed by the HTCO drops to 125 F, the cutout closes, restoring
circuit continuity. Air conditioner reset is as described in paragraph 1-13.
(1) Disconnect high temperature cutout switch wires from TB3.
(2) Check for continuity.
(3) If continuity is not present, replace defective high temperature cutout switch.
b. Removal.
(1) Remove two screws (1), Iockwashers (2), and nuts (3) holding high temperature cutout switch (4) to bracket
(5) on evaporator coil frame.
(2) Remove high temperature cutout switch (4).