Heater Thermostat (S3)

TM 5-4120-393-14

4-57. Heater Thermostat (S3)

This task covers:

a. Removal

c. Installation

b. Testing

Initial setup.

Tools:

Tool kit, service, refrigeration unit NSN 5180-00-596-1474

Personnel: 1

Equipment condition:

1. Turn unit power off at power source. If there is a chance that it will be turned on, also disconnect power cable

to air conditioner.

2. Remove mist eliminator. See para 4-32.

General Safety Instructions:

WARNING

Disconnect input power to the air conditioner before performing any internal

maintenance. Voltages used can KILL. Shutting the unit off at the control panel

does not disconnect unit power.

REMOVAL

Tag and disconnect leads.

Using screwdriver and wrench, remove two screws (1), washers (2), and nuts (3).

Remove thermostat (4).

TESTING

With thermostat at room tem perature, use a multimeter set on the lowest OHMS scale to check for continuity between

each pair of contacts (4 and 6, 4 and 5, and 5 and 6).

If continuity is not indicated between all contacts, replace the thermostat.

4-131