McQuay M5MAC Anleitung zur Fehlerbehebung PDF herunterladen (Seite 83)

McQuay Service Guide Book

Fuse for

operation

circuit

Evaporator fan

contactor

Evaporator fan

contactor

Evaporator fan

contactor

Over current

relay for

evaporator fan

By means of diagnostic flows chart:

Generally, there are two kinds of problems, i.e. starting failure and insufficient cooling/ heating.

“Starting failure” is caused by electrical defect while improper application or defects in refrigerant

circuit causes “insufficient cooling/ heating”.

i) Diagnosis of Electric circuit

: Faulty : Check : Cause : Remedy

NO cooling/ heating (Unit fail to start)

Unit Power

supply

Evaporator

fan motor

2 1

No voltage or low voltage

Wrong phase/ missing

phase

Components shorted

Components loose

High or low voltage

Wron

g / missing phase

Coil burned

Contact faulty

Faulty fan motor

Defective operation

Wrong/ missing phase

Get the right voltage

Stop

Repair the power line

Repair or replace the

components

Tighten the connections

Get the right v

oltage

Check the power supply

to the motor: repair

when necessary

Change the contactor

Repair the contact

Repair or change the

motor

Repair or change the

switch

Get the right voltage

Check the power supply

to the motor: repair

when necessary

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