Electra CN 25 DCI, Service Manual

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12-6
TROUBLESHOOTING
SM CN 1-E.1 GB
No. Fault Probable Cause Corrective Action
8 Compressor LoCN
Switch unit to STBY and
restart
If still not ok cheCN
compressor (12.5.4)
If comp is ok replace OU
controller
If compressor is not ok replace
compressor
9 Bad Communication
Communication quality
is low reliability CheCN Indoor to Outdoor
wiring and grounding
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 cheCNing the Main Parts
12.5.1 CheCNing 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 cheCN the Power (Circuit)
Breaker and look for broken or loosed cable lugs or wiring mistake(s).
12.5.2 CheCNing Power Input.
If Indoor unit power LED is unlighted, power down the system and cheCN 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.
CheCNing Power Input procedure for the Outdoor unit is the same as with the Indoor unit.
12.5.3 CheCNing the Outdoor Fan Motor.
Enter Test Mode (where the OFAN speed is high)
CheCN the voltage between lead wires according to the normal value as following:
•
Between red wire and blaCN wire: /- 20V
•
Between orange wire and blaCN wire: 15VDC +/- 1V
•
Between yellow wire and blaCN wire: 2-6VDC
CONTENT