OPERATOR TROUBLESHOOTING INTRODUCTION

TM 9-4120-425-14&P

OPERATOR TROUBLESHOOTING INTRODUCTION

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MALFUNCTION/SYMPTOM INDEX

The malfunction/symptom index (WP 0009-00) is a quick reference index for finding troubleshooting procedures.

Associated with each symptom name is a work package sequence number representing the starting point in a

troubleshooting sequence. Should any one symptom require more than one troubleshooting sequence to arrive at the

most likely area of investigation, the additional starting point numbers are presented.

As the troubleshooting activity progresses through to the conclusion of a particular sequence, a reference is made to the

next logical troubleshooting sequence by work package sequence number or by referring to the malfunction/ symptom

index to locate the next failure symptom work package. This type of activity continues until successful fault isolation is

achieved.

TROUBLESHOOTING PROCEDURES

The troubleshooting work packages contain tables listing the malfunctions, tests or inspections, and corrective

action required to return the air conditioner to normal operation. Perform the steps in the order they appear in the

tables.

Each work package is headed by an initial setup. This setup outlines what is needed as well as certain conditions which

must be met before starting the task. DON'T START A TASK UNTIL:

You understand the task.

You understand what you are to do.

You understand what is needed to do the work.

You have the things you need.

This manual cannot list all malfunctions that may occur, or all tests or inspections and corrective actions. If a

malfunction is not listed or is not corrected by listed corrective actions, notify unit maintenance.

GENERAL INFORMATION

Circuit Breaker

If the circuit breaker opens (trips) after it has been reset, notify unit maintenance.

Fan and Compressor Motor Lubrications

Motors driving the evaporator, condenser fans and compressor are permanently lubricated. The compressor is a sealed

unit complete with lubricant. The rotating parts do not need any lubrication.

Condenser Air Discharge Louvers and Control Linkages, Fresh Air Damper Door

Notify unit maintenance of any stiffness or binding of operation.

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