The following procedure applies to both heater No. 1 and heater No. 2 thermostats, with the exceptions
noted in text.
Refer to Figure 4-72 and inspect the thermostats and cables for visual signs of damage.
Check to see that each thermostat is operative by turning the thermostat to its full up or full down positions and
observing whether or not the heaters turn off or on as called for by the thermostat.
Disconnect cable (1) from the power input cable.
Cut tie wraps (2) to release the cable from the ceiling and walls of the ROWPU.
Remove four screws (3) and remove assembled thermostat with the cable (1) attached.
Remove four screws (5) and remove cover (6) from the thermostat housing.
Unscrew nut (7) and slide nut (7), retainer (8) and bushing (9) back on cable (1).
Refer to Figure 4-72, sheet 2 and tag and disconnect wires from cable (1) to the thermostat (4) control leads by
removing capscrew (10), lockwasher (11 ) and nut (12). Use a knife to remove the electrical tape and shrink wrapping
which encloses each connection.
Remove conduit nut (13) and remove elbow (14) and sealing ring (15). Do not attempt to further disassemble the
Figure 4-72. Thermostats (Sheet 3 of 3) Components
Change 7 4-251