McQuay M5MSX Spezifikationen PDF herunterladen (Seite 18)

By Means Of Diagnostic Flow 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

: Faulty : Check : Cause : Remedy

No cooling/heating ( Unit fails to start )

Evaporator

fan motor

No voltage or low voltage

Unit power

supply

Wrong phase/missing

phase

Get the right voltage

Repair the power line

Tripped

Blown

Running

Fuse for

operation

circuit

Components shorted

Connections loose

Repair or replace the components

Tighten the connections

Over current

relay for

evaporator

fan

High or low voltage

Wrong phase/missing

phase

Stop

Get the right voltage

Check the power supply to the

motor: repair when necessary

Evaporator

fan contactor

Coil burned

Contact faulty

Faulty fan motor

Defective operation switch

Change the contactor

Repair or change the motor

Repair the contacts

Repair or change the switch

Condenser

fan motor

Over current

relay for

condenser

fan

No voltage or low voltage

Wrong phase/missing

phase

Get the right voltage

Check the power supply to the

motor: repair when necessary

Running

Stop

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