Overheat thermostat, restriction thermostat, diode and electrical leads.

TM 9-2320-211-34-2-4

(3) Overheat thermostat, restriction thermostat, diode and electrical leads.

FRAME 1

CAUTION

R o u g h handling of thermostats can cause them not to

work properly.

C l e a n overheat thermostat (1), restriction thermostat (2), and diode (3) with

clean cloth.

I n s p e c t overheat thermostat (1), restriction thermostat (2), and diode (3)

for corrosion. If they are corroded, get new parts.

I f overheat thermostat (1) or restriction thermostat (2) are known not to be

w o r k i n g right get new ones.

NOTE

Thermostats and diode are not repairable. If they

d o not pass tests, get new ones.

P l a c e leads of ohmmeter on each terminal (4 and 5) of overheat thermostat (1).

C i r c u i t should be closed.

P l a c e one lead of ohmmeter on overheat thermostat case (1). Place other lead

o n terminal (4 or 5). C i r c u i t should be open.

Get new overheat thermostat (1) if it does not pass tests in steps 4 and 5.

D o steps 4, 5, and 6 again for terminals (6 and 7) of restriction thermostat

(2).

P l a c e leads of ohmmeter on ends of diode (3). N o t e if circuit is open or closed

S w i t c h leads on ends of diode. N o t e if circuit is open or closed.

C i r c u i t must be closed in one test and open in the other. If circuit is open

o r closed in both directions, diode must be replaced.

10. I n s p e c t electrical leads (8 and 9) for broken or worn insulation and broken

Inspect ground strap (10) for broken terminals.

terminals.

11. C h e c k continuity through electrical leads (8 and 9) and ground strap (10)

u s i n g an ohmmeter. Place an ohmmeter lead on each terminal of each lead.

G e t new electrical leads (8 and 9) or ground strap (10) if circuit is open.

END OF TASK

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