Figure 3-29. Test of heater thermostatic switch S4

TM 5-4120-356-14

TEST OF HEATER THERMOSTATIC SWITCH S4

NOTE

OPERATING TEMPERATURES

FOR HEATER THERMOSTATIC

SWITCH ARE AS FOLLOWS:

OPEN :

194F 5F

(90C 5C)

CLOSE :

110F 5F

(61C 5C)

PERFORM TEST AT AMBIENT

TEMPERATURE UNDER 194F

(90C).

CHECK FOR CONTINUITY BETWEEN WIRE NUMBER 1 AND WIRE NUMBER 2.

2. CHECK FOR CONTINUITY BETWEEN WIRE NUMBER 1 AND WIRE NUMBER 3.

3. CHECK FOR CONTINUITY BETWEEN WIRE NUMBER, 2 AND WIRE NUMBER 3.

4. OPEN CIRCUIT BETWEEN ANY OF THE ABOVE POINTS CONSTITUTES FAIL-

URE OF THIS TEST.

TS54120356-14/329

Figure 3-29. Test of heater thermostatic switch S4