TM 9-4120-378-14
4.25 JUNCTION BOX. - Continued
Remarks
Action
Location/Item
Time Delay
Relay (K1),
Heater Relay
(K2), Compres-
sor Motor Relay
(K3), Condens-
er Fan Motor
Relay (K4)
Inspect relays for any external damage to hous-
Inspection
a.
ing or contacts.
If damaged enough to prevent normal operation
b.
of relay, replace relay.
Control Circuit
Breaker (CB2)
Inspect control circuit breaker for external damage.
Inspection
a.
Inspect toggle for distinct click and engagement
b.
of switch when placed in ON or OFF positions.
Inspect contacts for damage.
c.
Replace circuit breaker if damaged enough to
d.
prevent normal operation.
Terminal Board
(TB1 ) and
Marker Strip
Inspect terminal board (TB1 ) for dents, breaks,
Inspection
a.
nicks or damaged terminals.
If unrepairable, replace terminal board.
b.
Inspect marker strip for illegibility or damage.
c.
d.
Replace marker strip if damaged.
Time Delay
Relay (K1)
Model
A9KH-115P
See fig. FO-1. and
Inspection
Tag and disconnect wire leads except for jumper
a.
fig. FO-2.
wire between terminals 1 and 2.
Use a continuity tester or a multimeter set on the
b.
lowest ohms scale on relay contacts 1 (+) to 5(-)
and 2 to 4. Continuity should exist.
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