TEMPERATURE SELECTOR (CONTROL SWITCH THERMOSTAT) S3.

TM5-4120-384-14

4-22.

TEMPERATURE SELECTOR (CONTROL SWITCH THERMOSTAT) S3.

The TEMPERATURE SELECTOR (Control Switch Thermostat) S3 is located

(See fig. 4-18.)

in the control module.

Removal.

Disconnect input power from the air conditioner

before performing maintenance on any part of the

electrical system.

The voltages used can be lethal.

(1)

Disconnect

power

source.

(2)

See

para

4-21a

and

remove

control

module.

4-18

and

remove

four

screws

and

pull

cover

off.

(3)

See

fig.

Remove

T E M P E R A T U R E S E L E C T O R knob.

(4)

Loosen

setscrew

knob.

(5)

Remove

three

screws

from

posts and

slip

mounting

frame

off.

(6) Tag and disconnect wires from TEMPERATURE SELECTOR.

(7) Remove four screws, washers, and

nuts

and

pull

T E M P E R A T U R E SELECTOR from mounting frame.

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

Turn the knob to the extreme cooler

thermostat (blue and red).

There should be no indication of continuity on

position.

Turn the knob to the extreme warmer position.

multimeter.

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 mounting frame and secure

with

four screws, washers and nuts.

4-66