Delta PG-35 User Manual download pdf (Page 48)

12-5

TROUBLESHOOTING

SM DELTAZ 1-E.0 GB

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.

12.2 Simple procedures for checking the Main Parts

12.2.1 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).

12.2.2 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.

12.2.3 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.

12.2.4 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 0.5 ohm (TBD).

Pay attention U,V, Ware respective to connect to RED, BROWN, BLACK wires.

12.2.5 Checking the Reverse Valve (RV).

Running in heating mode, check the voltage between two pins of reverse valve connector,

normal voltage is 220VAC.

12.3 Precaution, Advise and Notice Items

12.3.1 High voltage in Ou0tdoor 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.

12.3.2 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.

12.3.3 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

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Delta PG-35 User Manual Page 48

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