TEMPERATURE SELECTOR (CONTROL SWITCH THERMOSTAT) S3. (Cont)

TM5-4120-383-14

4-22.

TEMPERATURE SELECTOR (CONTROL SWITCH THERMOSTAT) S3.-

Continued

(5) Remove three screws from posts and slip back plate off.

(6) Tag and disconnect wires from TEMPERATURE SELECTOR.

(7) Remove four screws, washers, and nuts and pull

TEMPERATURE SELECTOR from back plate.

Test.

(1) Place the sensing bulb in a container of warm water, 75

to 85F (24 to 30C) and set multimeter to measure resistance on

Rx1 scale. Place multimeter leads on terminals 1 and 3 of the

thermostat (blue and red). Turn the knob to the extreme cooler

position. There should be no indication of continuity on

multimeter. Turn the knob to the extreme warmer position.

Continuity should be indicated on the multimeter.

(2) Center or mid-range of the Temperature Selector

represents a setting of about 75F (24C). With the sensing bulb

remaining in the container of warm water~ 75 to 85F (24 to

30C), slowly turn the knob from the extreme warmer position

towards the cooler position. Continuity should cease before or

near mid-range of the knob.

Replace.

Replace TEMPERATURE SELECTOR if defective.

Installation.

(1) Place TEMPERATURE SELECTOR on back plate and secure with

four screws, washers and nuts.

(2) See wiring diagram figure 4-4 and tags and connect wire

leads. Remove tags.

(3) Align holes in back plate with the three posts and secure

with screws.

(4) Check that grommets are in place in shaft holes.

Install

TEMPERATURE SELECTOR knob and tighten setscrew.

(5) Slip cover in place and secure with four screws.

(6) See paragraph 4-21c and install control module.

(7) Connect power at power source.

4-65