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 TM 5-4120-393-14
5-28. Compressor (B1) (cont)
c.
Check continuity between P21 contact D and heater terminal A and contact E and terminal B. If continuity is not
indicated, repair or replace wire leads.
d.
Check continuity between heater half terminals. If continuity is not indicated, replace heater.
e.
Check heater (HR8) for visible damage, missing terminals or terminal covers, and secure attachment of clamping
hardware.
f.
Continuity check thermostat (S10) at connector P21 in accordance with following chart.
TEMPERATURE
CONTACT
CONTACT
AT S10 THERMOSTAT
A to B
A to C
Above 70 + 8F
CLOSED
OPEN
(21.1 + 4.4C)
Below 50 5F
OPEN
CLOSED
(10 2.8C)
Thermostat actuates at 70 8F (21.1 4.4C) and resets at 50 + 5F (10 2.8C)
NOTE
If the thermostat fails any of the above tests check that splices are properly
installed. Repeat above test. Replace thermostat (S10) if bad.
4.
Check compressor (B1), motor protector (S4), heater (HR7), and thermostat (S8) as follows:
a.
Disconnect P11 connector and harness from J11 connector located on compressor junction box.
5-67
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