McQuay M5MAC Guía para resolver problemas 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. 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

Restricted

Insufficient cooling

Air

circulation

Indoor / outdoor coil dirty

(clogged)

Indoor air filter dirty

Clean the coil

Clean the filter

Fan motor malfunction

Obstruction at air inlet /

outlet of indoor / outdoor

unit

Change or repair

the motor

Remove the

obstruction

High cooling

load

Excessive heat source.

e.g. electric kettle

Room overcrowded with

people

Windows / doors wide

open

Remove or reduce

heat source

Reduce number

of people in the room

Close the

windows / doors

Refrigerant

circuit

Restriction e.g. at

strainer, capillary, filter

dryer, etc.

Refrigerant short charge

or refrigerant leakage

Add refrigerant.

Repair leakage

if detected

Repair clogging

or replace faulty

components

Compressor

Less or no compression

(Low running current)

Replace compressor

Satisfactory operation with temperature difference of air

intake & discharge of indoor unit 8°C to 13°C. *

( * value is for reference only )

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