TROUBLESHOOTING
SM PNXADCI 1-A.1 GB
13-7
13.2.1
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).
13.2.2
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.
13.2.3
Checking the Outdoor Fan Motor.
Enter Test Mode (where the OFAN speed is high)
check the voltage between two pins( Hi and N ) of connector Controller OFAN, normal voltage
is 220VAC.
13.2.4
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 0.7
ohm. Pay attention U,V, W are respective to connect to RED,BROWN,BLACK wires.
13.2.5
Checking the Reverse Valve (RV).
Running in heating mode, check the voltage between two pins of reverse valve connector,
normal voltage is 220VAC.
13.3
Precaution, Advise and Notice Items
13.3.1
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.
13.3.2
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.
13.3.3
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
