Heater Elements.

TM 5-4120-352-14

4-35. Heater Elements.

c. Cleaning and Inspection. Wipe off any ac-

a. Genera 1. The air conditioner is equipped with

cumulation of dust and test as described below.

six heating elements, two across each phase. One

(1) Test for continuity between contacts 1 and

element in each phase is switched out for low heat.

2 and also between contacts 3 and 4. Contacts

A thermostatic switch cycles off and on to provide

should open on temperature rise at 150 F + 5 (65.5

temperature contro.

C + 2.25) and close on temperature drop at 110 F +

b. Removal. Refer to figure 4-10 and remove

10 (43 c + 5.50).

heater elements as follows:

(2) Replace switch if it fails to meet test re-

(1) Refer to figure 4-5 and remove housing

quirements.

cover.

d. Installation. Refer to figure 4-9 and install

(2) Disconnect leads from heaters.

heater thermostatic swithc.

(3) Remove two screws, washers, and lock

(1) Refer to wiring diagram and connect leads

washers that secure heater support to housing. Slide

(6) to switch (7) with screw (5).

support from ends of heater elements.

(2) Attach switch to bracket (4) with screws

(4) Remove heater element nut, lockwasher

(2) and lockwashers (3).

and flat washer from each heater in turn, and slide

(3) Secure bracket to center cover with two

heater from bracket.

screws (l).

(4) Refer to figure 4-5 and install housing

front cover.

4-23