Diagnosis Of Electric Circuit - Acson ART 55 A Technical Manual

By Means of Diagnostic 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 improper application or defects in refrigerant circuit causes "Insufficient
cooling / heating".
i) Diagnosis of Electric Circuit
: Faulty
No Cooling/heating (Unit fails to start)
Evaporator
Fan Motor
Unit Power
Running
Overcurrent
Evaporator Fan
Evaporator FAn
Condenser
Fan Motor
Overcurrent
Condenser Fan
Running
Condenser Fan
Compressor
Stop
Faulty
Supply
Fuse For
Blown
Operation
Circuit
Tripped
RelayFor
Faulty
Contactor
Stop
Tripped
Relay For
Faulty
Contactor
Faulty
Contactor
The most common causes of air conditioner failure to "start" are :
a) Voltage not within ±10% of rated voltage.
b) Power supply interrupted.
c) Improper control settings.
d) Air conditioner is disconnected from main power source.
e) Fuse blown or circuit breaker off.
: Check
No Voltage or Low Voltage
Wrong Phase/Missing Phase
Components Shorted
Connections Loose
High or Low Voltage
Wrong Phase/Missing Phase
Coil Burnt
Contact Family
Faulty Fan Motor
Defective Operation Switch
High Voltage or Low Voltage
Wrong Phase/Missing Phase
Coil Burnt
Contact Faulty
Fan Motor Faulty
Other Electrical Component Faulty
Coil Burnt
Contact Faulty
Open Compressor Windings
Incorrect Wiring
175
: Cause
Repair the Power Line
Repair or Replace The Components
Tighten The Connections
Get The Right Voltage
Check The Power Supply To The
Motor : Repair When Necessary
Change The Contactor
Repair Or Change The Motor
Repair Or Replace The Switch
Get The Right Voltage
Check The Power Supply To The
Motor : Repair When Necessary
Change The Contactor
Change The Contacts
Repair or Change The Motor
Repair or Change If Necessary
Change The Contactor
Change The Contacts
Change The Compressor
: Remedy
Get the Right Voltage
Repair The Contacts
Correct The Wiring