Compressor (B1)

TM 5-4120-393-14

5-28. Compressor (B1)

This task covers:

a. Inspection

c. Installation

b. Replacement

Initial setup.

Tools:

Tool kit, service, refrigeration unit NSN 5180-00-596-1474

Leak detector NSN 4940-00-531-0362

Personnel: 1

Material:

Tubing, insulation (Appendix E, item 17)

Equipment condition:

1. Turn unit power off at power source. If there is a chance that it will be turned on, also disconnect power cable

to air conditioner.

2. Remove lower front panel. See para 4-24. Remove junction box number one. See para 4-40.

3. Remove junction box number two. See para 4-46.

General Safety Instructions:

WARNING

Disconnect input power to the air conditioner before performing any internal

maintenance. Voltages used can KILL. Shutting the unit off at the control panel

does not disconnect unit power.

NOTE

The compressor and motor assembly are hermetically sealed in a metal canister

and are not repairable. The following items may be replaced without opening the

refrigerant system: Connector (J11), Heater (HR7), Thermostat (S4), Heater (HR8),

Thermostat (S10), and Connector (P21) and Harness.

INSPECTION

Check to be sure power has been disconnected from air conditioner. Shutting the unit off at the control panel does

not disconnect power to compressor heaters.

Allow heaters to cool before touching.

Check quick warm up heater (HR8) and thermostat (S10) as follows:

Using a multimeter, check continuity between contacts D and E on P21 connector.

Continuity should be

indicated. If continuity was indicated got to step e.

Check that jumper between heater valves is secure. Check jumper for continuity. If continuity is not indicated,

repair or replace jumper.

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