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 TM 9-4120-430-14
0028 00
Unit Grounding Lug (Figure 4)
1.
Disconnect grounding lug (1, figure 4), by removing screw (2), flat washer (3), and star washer (4) from rivet nut (5)
on unit housing.
2.
Inspect unit grounding lug for damage, corrosion or missing parts. Replace as necessary.
Figure 4. Unit Grounding Lug
TEST
Compressor Control Time Delay Device (TD) (Figure 3)
1.
Tag and disconnect wire leads from all terminals.
2.
Using a known functional relay, such as K1, connect the relay coil A terminal to time delay device terminal No. 1.
3.
Apply a 24 plus/minus 5 V ac power source to terminal No. 2 on time delay device and B terminal on relay. Test
relay should pull-in in approximately 60 plus/minus 20 seconds.
4.
Replace if it fails test.
Compressor Motor and Condenser Motor Relay (K1), S9160-18K-3 Unit
1.
Tag and disconnect wire leads.
2.
Use a multimeter and check continuity. Set the lowest ohm to check continuity between terminals L1 to T1, L2 to
T2, and L3 to T3. All contacts should be open. If there is continuity, replace the relay. See schematic in WP 0040
3.
Check continuity between terminals A and B. If there is no continuity, the coil is open. Replace the relay.
4.
Apply 24 V ac across terminals A and B and repeat continuity checks between terminals L1 to T1, L2 to T2, and L3
to T3. All three contacts should be closed. If there is no continuity, replace the relay.
Compressor Motor and Condenser Motor Relay (K1), S9150-18K-1 Unit
1.
Tag and disconnect wire leads.
0028 00-5
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