McQuay M5MAC Guide de dépannage télécharger pdf (Page 87)

McQuay Service Guide Book

Mini Chiller: Troubleshooting Guide

When any malfunction is occurred, immediately switch off the power supply to the unit, and contact

the local dealer, if necessary. Some simple troubleshooting tips are given below:

Symptoms Possible Causes Remedial Action

1. Compressor does not start

•

No power supply

•

Fuses blown or automatic

circuit breakdown open

•

Defective contactor or coil

•

Unit is stopped because a

safety has tripped

•

Loose wires

•

Compressor faulty

•

Check power supply

•

Look for short circuit or

grounded wires in motor

windings

Replace fuses and reset

circuit breakers when the

fault has been corrected

Check tightness and

soundness of all electrical

connection

•

Repair or replace

•

Determine the type of safety

shut down and correct the

unit is restarted

•

Check wire connection and

tighten terminal screw

•

Contact local dealer

2. Fan does not start

•

No power supply

•

Fan motor faulty

•

Check power supply

•

Contact local dealer

3. Air conditioning does work,

but insufficient cooling

•

Thermostat setting too high

•

Condenser coil dirty

•

Obstacle blocking air inlet or

outlet of the unit

•

Insufficient refrigerant in the

system

•

Improper water flow rate

•

Water in the system is

contaminated

•

Reset thermostat

•

Contact local dealer

•

Remove the obstacle

•

Contact local dealer

•

Contact local dealer

•

Contact local dealer

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McQuay M5MAC Guide de dépannage Page 87

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