Electra DELTA 22 Service Manual page 50

TROUBLESHOOTING
1.5.3 Checking the PCB.
Appearance inspect: Check discoloration, nick and connection of copper foil, short-circuit and open
circuit, component soldering, bulgy and distortion of electrolytic capacitor.
Power circuit check: check voltage of every power level (5V, 12V, 15V) printed on back of PCB.
1.5.4 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:
x
Between red wire and black wire: 310VDC +/- 20V
x
Between orange wire and black wire: 15VDC +/- 1V
x
Between yellow wire and black wire: 2-6VDC
1.5.5 Checking the Compressor.
The compressor is brushless permanence magnetic DC motor. Three coil resistances are THE
same. Check the resistance between three poles.
1.5.6 Checking the Reverse Valve (RV).
Running in heating mode, check the voltage between two pins of reverse valve connector,
normal voltage
1.5.7 Checking the electrical expansion valve (EEV).
The EEV has two parts, drive part and valve. The drive part is a step motor; it is ringed on the
valve. Check the drive voltage (12VDC). When Outdoor unit is power on, EEV shall run and
have click and vibration.
1.6 Precaution, Advise and Notice Items
1.6.1 High voltage in Outdoor unit controller.
Whole controller, including the wires, connected to the Outdoor unit controller may have the
potential hazard voltage when power is on. Touching the Outdoor unit controller may cause an
electrical shock.
Advise: Don't touch the naked lead wire and don't insert finger, conductor or anything else into
the controller when power is on.
1.6.2 Charged Capacitors
Three large-capacity electrolytic capacitors are used in the Outdoor unit controller. Therefore,
charging voltage (380VDC) remains after power down. Discharging takes about three minutes
after turned off. Touching the Outdoor unit controller before discharging may cause an electrical
shock. When open the Outdoor unit controller cover, don't touch the soldering pin by hand or by
any conductive material.
Advise: 1. Open the Outdoor unit controller cover only after five minutes from power down.
2. Measure the electrolytic capacitors voltage before farther checking controller for
safety.
1.6.3 Additional advises
When disassemble the controller or the front panel, turn off the power supply.
When connecting or disconnecting the connectors on the PCB, hold the whole housing, don't
pull the wire.
There are sharp fringes and sting on shell. Use gloves when disassemble the A/C units.
12-6
is 220VAC.
CONTENT
SM DUO38 1-E.1 GB