TM 9-4120-388-14
4-60. HEAT CUTOUT (THERMOSTAT) SWITCH (S4) - Continued.
b.
Test. With thermostat at room temperature, use a multimeter set on the lowest OHMS scale to check for continu-
ity between each pair of contacts (4 and 6 ,4 and 5, and 5 and 6). If continuity is not indicated between all con-
tacts, replace the thermostat.
NOTE
For full operational test of thermostat use an external heat source. Thermostat should
open (no continuity across contacts) at temperature increase of 194F 9 (90C 5)
and close at temperature decrease at 142F 16 (61C 9).
Installation.
c.
(1) If bracket was removed, secure bracket to heater support with two screws, Iockwashersj and flat washers.
(2) Secure thermostat to bracket with two screws and lock nuts.
(3) See tags and wiring diagram (Figure 4-16) and solder wire leads.
(4) Remove tags.