Junction Box - TM-9-4120-425-14-P0161

TM 9-4120-425-14&P

JUNCTION BOX ASSEMBLY UNIT MAINTENANCE - Continued

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REMOVAL AND INSPECTION - Continued

Junction Box-Continued

NOTE

It is not necessary to remove junction box completely from unit. Most repairs and

replacements can be made without removing junction box completely. Junction box

can be moved out approximately 18 inches from the unit.

Remove cover (15) by removing four screws (14).

Inspect wiring for cracked or frayed insulation and loose connections.

Replace junction box if damaged enough to prevent normal operation of air conditioner.

Compressor Motor and Condenser Motors Relay (K1), Heaters Relay (K2), Evaporator Fan Motor

Relay (K3), Time Delay Device (TD)

Inspect relays (20) for any external damage to housing.

If damaged enough to prevent normal operation of relay, replace relay.

Terminal Boards (26 and 30) and Marker Strips (27 and 29)

Inspect terminal boards for dents, breaks, nicks or damaged terminals.

If unrepairable, replace terminal board.

Inspect marker strips for illegibility or damage.

Replace marker strip if damaged.

Unit Ground Stud (41) (Figure 3)

Inspect unit ground stud for damage, corrosion or missing parts. Replace as necessary.

TEST

Compressor Control Time Delay Device (TD) (24)

Tag and disconnect wire leads from all terminals.

Using a known functional relay, such as K1, connect the relay coil A terminal to time delay device terminal No.1.

Apply a 24 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 20 seconds.

Replace if it fails test.

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