McQuay M4MC Spezifikationen PDF herunterladen (Seite 59)

Faulty

: Faulty : Che ck : C aus e : Reme dy

Tripped

Blow n

Ru nning

Tig hte n t he connections

Stop

Get the right volta ge

Ch eck the pow er supply to the

mo tor: re pair w hen necess ary

Evapo rato r

fan contactor

Ch ange the con tactor

Repa ir t he contacts

Repa ir or c hange the s witch

Get the right volta ge

Ch eck the pow er supply to the

mo tor: re pair w hen necess ary

Ru nning

Stop

Over current relay

for condenser fan

Condenser

fan motor

No voltage or low voltage

Wrong phase / missing

phase

Defective operation switch

Faulty fan motor

Contact faulty

Coil burned

Wrong phase/missing

phase

High or low voltage

Connections loose

Components shorted

Wrong phase/missing

phase

No voltage or low voltage

Get the right voltage

Repair the power line

Repair or replace the components

Repair or change the motor

Fuse for operation

circuit

Over

current relay for

evaporator fan

Unit

power supply

Evaporator

fan motor

No cooling / heating ( Unit fails to start)

By means of diagnostic ow chart:

Generally, there are two kinds of problems, i.e. starting failure and insufcient cooling/heating. “Starting failure”

is caused by electrical defect while improper application or defects in refrigerant circuit causes “Insufcient

cooling / heating”.

i ) Diagnosis of Electric circuit

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