Diagnosing Using the Liquid Line

TM 10-4110-262-13&P

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Diagnosing Using the Liquid Line

The liquid line should be slightly warmer than the surrounding air.

1. A low refrigerant charge may cause the liquid line to be warmer than normal.

2. A liquid line restriction will cause the line to become cold after the point of restriction.

CONTROLLER DIAGNOSTICS

Before starting troubleshooting, verify that the control box 12/24 V selector is placed in the 24V position

and check the ground circuit through Pin 9 (Wire W).

NOTE

This procedure covers only control box PC board functions and does not

address all possible electrical contingencies.

PC board Diagnostic Hints

The balance of this work package is devoted to diagnostic routines designed to help the technician

quickly identify the cause of a problem and repair it using the correct tools, information and procedures.

It is important that the required procedures be followed exactly. Failure to do so may result in an

incomplete repair.

Important Diagnostic Consideration

When performing diagnostics, consider if the refrigeration system rather than the controls may cause

the problem. Diagnostic procedures for refrigeration system problems were outlined previously in this

work package.

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