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12.4
Judgment by MegaTool
MegaTool is a special tool to monitor the system states.
Using MegaTool requires:
•
A computer with RS232C port.
•
A connection wire for MegaTool.
•
A special MegaTool software.
Use MegaTool according to following procedure:
•
Setup MegaTool software: copy the software to the computer.
•
Connect RS232C port in computer with MegaTool port in Indoor/Outdoor unit
controller by the connection wire.
•
Run the software and choose the COM port, you can monitor the A/C system state
in monitor tab.
12.5
Simple procedures for checking the Main Parts
12.5.1
Checking Mains Voltage.
Confirm that the Mains voltage is between 198 and 264 VAC. If Mains voltage is out of this
range, abnormal operation of the system is expected. If in range check the Power (Circuit)
Breaker and look for broken or loosed cable lugs or wiring mistake(s).
12.5.2
Checking Power Input.
If Indoor unit power LED is unlighted, power down the system and check the fuse of the Indoor
unit. If the fuse is OK replace the Indoor unit controller. If the fuse has blown, replace the fuse
and power up again.
Checking Power Input procedure for the Outdoor unit is the same as with the Indoor unit.
12.5.3
Checking the Outdoor Fan Motor.
Enter Test Mode (where the OFAN speed is high)
Check the voltage between lead wires according to the normal value as following:
•
Between red wire and black wire: 310VDC +/- 20V
•
Between orange wire and black wire: 15VDC +/- 1V
•
Between yellow wire and black wire: 2-6VDC
12.5.4
Checking the Compressor.
The compressor is brushless permanence magnetic DC motor. Three coil resistance is
same. Check the resistance between three poles. The normal value should be below 0.5
ohm (TBD).
12.5.5
Checking the Reverse Valve (RV).
Running in heating mode, check the voltage between two pins of reverse valve
connector, normal voltage is 220VAC.
12.5.6
Checking the electrical expansion valve (EEV).
The EEV has two parts, drive part and valve. The drive part is a step motor
the valve. Check the drive voltage (12VDC). When Outdoor unit is power on, EEV shall
run and have click and vibration.
Service Manual – WNG DCI
Revision 0
CONTENT
TROUBLESHOOTING
12-7
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