Electra DELTA 25, Service Manual

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12-6
TROUBLESHOOTING
Revision Y05-01 Service Manual - Delta DCI
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: /- 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; 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.
12.6 Precaution, Advise and Notice Items
12.6.1 High voltage in Outdoor unit controller.
Whole controller, including the wires that are 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.
12.6.2 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 four minutes after power is off.
Touching the Outdoor unit controller before discharging may cause an
electrical shock.
12.6.3 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.