Acson A4LC 40 C User Manual

22
No Cooling / Heating
Unit fail to start
Check power supply
- voltage
- phase
- frequency
Check settings of remote control box
Compressor fails to start
Check circuit breaker & fuse
Check power source cord
Fan fails to start
Fan Motor Capacitor defective
Loose Connections,
Contactors
Irregular motor resistance (W)
& insulation (M W)
Replace Fan Motor
Compressor Motor damaged ( to replace compressor)
Thermostat setting too high
Protection Device Actuated
Reset
Compressor locked (to replace compressor)
Voltage supply not within range
Check motor resistance ( W ) and insulation (M W)
Compressor
Capacitor Defective
Loose Connections,
Improper wiring
Regular but fails
to start
Irregular
For Heat Pump Models
BY MEANS OF PRESSURE READINGS :
PRESSURE PROBABLE CAUSE
Data
Circuit
Too Low A Little Low Normal A Little High Too High
High Side
Low Side
=
=
1. Overcharged with refrigerant.
2. Non-condensable gases in refrigerant circuit (e.g. oil).
3. Obstructed air-intake/discharge.
4. Short circuiting of hot air outdoor unit.
High Side
Low Side
=
=
1. Poor compression/no compression (compressor
defective.)
2. Check valve stick in open position.
3. Reversing valve leaking.
High Side
Low Side
=
=
1. Undercharged with refrigerant.
2. Refrigerant leakage.
3. Air filter clogged/dirty (indoor unit).
4. Indoor fan locked.(cooling)
5. Defective defrost control, outdoor coil freezed up
(heating).
6. Outdoor fan locked (heating).
High Side
Low Side
=
=
1. Outdoor fan blocked (cooling).
2. Outdoor coil dirty (cooling).
3. Indoor fan locked (heating).
4. Indoor filter clogged/dirty (heating).
5. Non-condensable gases in refrigerant circuit (e.g. air)
High Side
Low Side
=
=
1. Air intake temperature of indoor unit too high.
BY MEANS OF DIAGNOSIS FLOW CHART
Generally, there are two kinds of problems, i.e. starting failure and insufficient cooling/heating. "Starting
Failure" is caused by electrical defect while "Insufficient Cooling/Heating" is caused by improper
application or defects in refrigerant circuit.
i) Diagnosis of Electric Circuit

Acson A4LC 40 C Specifications

General

Brand	Acson
Model	A4LC 40 C
Category	Air Conditioner
Language	English