Airwell CKD 036, Service Manual

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13-1
TROUBLESHOOTING
SM CKDDCI 2-A.3 GB
13. TROUBLESHOOTING
13.1 Precaution, Advise and Notice Items
13.1.1 High voltage in Indoor and Outdoor unit electrical assembly
 Open the Outdoor unit controller assembly only after one minute from power off.
 Whole controller assembly, including the wires, connected to the Outdoor unit may have the
potential hazard voltage when power is on.
 Touching the Outdoor unit controller assembly may cause an electrical shock.
 Do not touch the naked lead wire and don’t insert finger, conductor or anything else into the
controller when power is on.
13.1.2 Charged Capacitors
 Large capacity electrolytic capacitors are used in the outdoor unit controller and driver.
 Charging voltage (380VDC) remains after power is down.
 Discharging takes about one minute after turned off.
 Touching the outdoor unit electrical assembly before discharging may cause an electrical
shock.
 Measure the electrolytic capacitors voltage to be below 50VDC before further checking
electrical assembly parts.
13.1.3 Advisory Notes
 When open the Outdoor unit electrical assembly, don’t touch the soldering pin by hand or by
any conductive material.

When connecting or disconnecting the connectors on the PCB, hold the whole housing, don’t
pull the wire.
WARNING!!!
 When Power Up – the outdoor and indoor unit electrical assemblies, including the
wiring, are under HIGH VOLTAGE!!!
 Never open the outdoor or indoor units before turning off ALL Power sources!!!
 When turned off, the outdoor unit electrical assembly is still charged (400V)!!!
 DC capacitors are discharging for about 3 Minute after power is OFF.
 Touching the electrical before discharging may cause an electrical shock!!!

For safe handling of the electrical assembly please refer to section 13.1 above.