66
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 breake & fuse
Check power source cord
Fan fails to start
Fan Motor Capacitor defective
Loose Connections,
Contactors
Irregular motor resistance (
Ω
)
& insulation (M
Ω
)
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 (
Ω
) and insulation (M
Ω
)
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.
5. Defective defrost control, outdoor coil freeze 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 kind 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
Summary of Contents for ACC 10 C/CR
Page 16: ...15 MODEL ACC50C MODEL ACC60C...
Page 26: ...25 MODEL ACC 60 ALC 60C FOR EXPORT SPEC WITH MC MODEL ACC 60C ALC 60C FOR LOCAL SPEC...
Page 27: ...26 MODEL ACC 60C AMC 60C FOR EXPORT SPEC WITH SLM CONTROL C3 0BCC...
Page 28: ...27 MODEL ACC 10CR 15CR ALC A4LC 10BR 15BR...
Page 29: ...28 MODEL ACC 20CR 25CR ALC A4LC 20BR 25BR...
Page 30: ...29 MODEL ACC 30CR ALC A4LC 30CR...
Page 31: ...30 MODEL ACC 40CR 50CR ALC A4LC 40CR 50CR...
Page 32: ...31 MODEL ACC 60CR ALC 60CR...
Page 33: ...32 MODEL ACC 60CR AMC 60CR FOR EXPORT SPEC WITH SLM CONTROL C3 0BCC...
Page 37: ...36 MODEL ACC 60C AMC 60C FOR EXPORT SPEC WITH SLM CONTROL U1 4...
Page 38: ...37 MODEL ACC 10 15CR ALC A4LC 10 15BR FOR EXPORT SPEC WITH SLM CONTROL U1 4...
Page 39: ...38 MODEL ACC 20 25CR ALC A4LC 20 25BR FOR EXPORT SPEC WITH SLM CONTROL U1 4...
Page 40: ...39 MODEL ACC 30CR ALC A4LC 30CR FOR EXPORT SPEC WITH SLM CONTROL U1 4...
Page 41: ...40 MODEL ACC 40 50CR ALC A4LC 40 50CR FOR EXPORT SPEC WITH SLM CONTROL U1 4...
Page 42: ...41 MODEL ACC 60CR ALC 60CR FOR EXPORT SPEC WITH SLM CONTROL U1 4...
Page 43: ...42 MODEL ACC 60CR AMC 60CR FOR EXPORT SPEC WITH SLM CONTROL U1 4...
