Diagnosis Of Refrigerant Circuit / Application - Acson ART 55 A Technical Manual

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.
Insufficient cooling
Air
circulation
High cooling
load
Refrigerant
circuit
Compressor
Satisfactory operation with temperature difference of air
intake & discharge of indoor unit 8°C to 13°C. *
( * value is for reference only )
Faulty
Indoor / outdoor coil dirty
Restricted
(clogged)
Indoor air filter dirty
Fan motor malfunction
Obstruction at air inlet /
outlet of indoor / outdoor
unit
Excessive heat source.
e.g. electric kettle
Room overcrowded with
people
Windows / doors wide
open
Refrigerant short charge
or refrigerant leakage
Restriction e.g. at
strainer, capillary, filter
dryer, etc.
Less or no compression
(Low running current)
Check Cause
176
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
Replace compressor
Remedy
Clean the coil
Clean the filter