McQuay M4MC Especificaciones descargar pdf (Pagina 61)

ii ) Diagnosis of Refrigerant Circuit / Application

There might be some causes where the unit starts running but does not perform satisfactorily, i.e. insufcient

cooling. Judgement could be made by measuring temperature difference of indoor unit’s intake and dis-

charge air as well as running current.

Restricted

Cl ean t he c oil

Ch ange o r repa ir t he m o to

Hi gh cooling

load

Remo ve or red uc e heat source

Red uc e num ber of pe ople in the roo m

Cl ose the w in dow s / doo rs

Refrigerant

circuit

Refrigerant sho rt c har ge

or re frigerant leakage

Ad d refri gera nt. Repa ir l e akage if de tected

Repa ir clo gg in g or replace fa ult y com po nents

Com press or

Less or no comp re ssi on

(Low running curren t)

Rep lace c omp ress or

Satisfactor y op era tion with temp eratur e differenc e of air

intake & disch arge of indoor un it 8°C to 13°C . *

( * value is for refe renc e on ly )

: Faulty

: Check : Cause : Remedy

Room over crowded with

people

Windows/doors wide open

Restriction e.g. atstrainer,

capillary, filter dryer, etc.

Obstruction

at air inlet / outlet of indoor /

outdoor unit

Excessive heat source.

e.g. electric kettle

Fan motor malfunction

Indoor air filter dirty

Indoor/outdoor coil dirty

(clogged)

Remove the obstruction

Clean the filter

Air

circulation

Insufficient cooling

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McQuay M4MC Especificaciones Pagina 61

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