TM9-4120-370-14
To35E9-229-1
4-56. COMPRESSOR RELAY (K9) - Continued.
(2) Check relay for cracks, evidence of overheating, and other visible damage.
Replace if damaged.
Test
c.
(1)
Use continuity tester or a Multimeter set on the lowest OHMS scale to check continuity between terminals
A1 and A2, B1 and B2, and C1 and C2. All three contacts should be open. If there is continuity, replace
the relay.
Check continuity between coil terminals X1 and X2. If there is no continuity, the coil is open. Replace the
(2)
relay.
Apply external 24 volts dc power source across terminals X1 and X2 and repeat continuity checks between
(3)
terminals A1 and A2, B1 and B2, and C1 and C2. All three contacts should be closed. If there is no
continuity, replace the relay.
(4)
Remove the external 24 volt dc power source from coil terminals Xl and X2.
d. Installation
(1) Place U type spring nuts on four mounting holes.
(2) Using screwdriver, secure relay with four screws.
(3) See tags and wiring diagram (Figure 4-20) and connect wire leads.
(4) Remove tags.
(5) Using a screwdriver, secure junction box cover with ten screws and lock washers.
Install junction box. (See para 4-45.)
Follow-on procedure:
Remove junction box. (See para 445.)
Preliminary procedure:
