McQuay M5MAC Guia de Resolução de Problemas descarregar pdf (Página 85)

McQuay Service Guide Book

ii) Diagnosis of Refrigerant Circuit/ Application

There might be some causes where the unit starts to run but does not perform satisfactorily, i.e.

insufficient cooling. Judgement could be made by measuring temperature difference of indoor unit’s

intake and discharge air as well as running current.

: Faulty : Check : Cause : Remedy

Insufficient cooling

Air

Calculation

Indoor/ outdoor dirty

(clogged)

Indoor air filter dirty

Obstruction at air inlet/

outlet of indoor/ outdoor

unit

Fan motor malfunction

High Cooling

load

Excessive heat source

e.g. electric kettle.

Room overcrowded with

people

Windows/ doors wide

open

Refrigerant short charge

or refrigerant leakage

Refrigerant

Circuit

Restriction e.g. at

strainer, capillary, filter,

dryer, etc.

Compressor

Less or no compression

(Low running current)

Satisfactory operation with temperature difference of air

intake & discharge of indoor unit 8ºC to 13ºC.*

(* Value is for reference only)

Clean the coil

Clean the filter

Change or repair the

motor

Remove the obstruction

Remove or reduce heat

source

Reduce number of

people in the room

Close the windows/

doors

Add refrigerant

Repair leakage if

detected

Repair clogging or

replace faulty

components

Repair compressor

Restricted

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