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TM 9-4120-389-14
4-49. COMPRESSOR RELAY (K3), CONDENSER FAN RELAY (K4), EVAPORATOR FAN RELAY (K6)
AND HEATER RELAYS (K2 AND K5)
WARNING
Voltages used can kill. Always disconnect power cord to air
conditioner
before
performing
any
internal
maintenance.
Shutting unit off at its control module does not disconnect unit
power.
NOTE
The following procedures shall apply to relays K3, K4, K6, K2
and K5. Replacement parts are identical.
Preliminary procedure: Remove junction box (See para. 4-46).
a.
Inspection
(1)
Check for loose, corroded, or broken terminal connections. Replace defective relay.
(2)
Check relays for cracks, evidence of overheating and any other visible damage. Replace if
damaged.
b.
Removal
(1)
Tag and remove wire leads.
(2)
Remove four screws, flat washers and self locking nuts in relay.
(3)
Remove relay.
c.
Test
(1)
Using a continuity or a multimeter set on the lowest OHMS scale to check continuity between
terminals L1 and T2, L2 and T2, L3 and T3. All three contacts should be open. If there is continuity, replace
the relay.
4-150
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