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TM5-4120-377-14
b. Test. With thermostat at room temperature, 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.
NOTE
For full operational test of thermostat use an external heat source. Thermostat should
open (no continuity across contacts) at temperature increase of 194°F ± 9° (90°C ± 5°)
and close at temperature decrease at 142°F ± 16° (61°C ± 9°).
c. Installation
(1) If bracket was removed, use screwdriver and secure bracket to heater support with two screws, lock
washers, and flat washers.
(2) Using screwdriver and wrench, secure thermostat to bracket with two screws and lock nuts.
(3) See tags and wiring diagram (fig. 4-20) and solder wire leads.
(4) Remove tags.
Follow-on procedure: Install top cover. (See para 4-28.)
4-61. ELECTRIC HEATER (ELEMENTS) (HR1 THROUGH HR6)
Preliminary procedure:
Remove top panel. (See para 4-28.)
TS4120-377-14/4-72
Figure 4-72. Electric Heater (Elements) (HR1 through HR6)
4-113
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