GREE ELECTRIC GUHD09NK3CO Service Manual page 98

U-Match Series DC
Inverter Service Manual
The air-conditioning unit must have grounding to avoid hazard owing to insulation failure.
arc may arise.
All line connections must conform to the schematic diagram of lines. Wrong connection may cause abnormal
operation or damage of the air-conditioning unit.
Do not let any cable contact the refrigerant pipe, the compressor and moving parts such as fan.
Do not change the internal line connections inside the air-conditioning unit. The manufacturer shall not be liable
for any loss or abnormal operation arising from wrong line connections.
4.1.3 Power Cable Connection
a. Air-conditioning unit with single-phase power supply
Remove the front-side panel of the outdoor unit.
Pass the cable though rubber ring.
Connect the power supply cable to the "L, N" terminals and the grounding screw.
b. Air-conditioning unit with 3-phase power supply
Remove the front-side panel of the outdoor unit.
Attach rubber ring to the cable-cross hole of the outdoor unit.
Pass the cable though rubber ring.
Connect the power cable to the terminal and earthing screws marked "L1, L2, L3 & N".
Caution:
For air-conditioner with auxiliary heater, it is required to connect the power cable to the "L1, L2 L3"terminals
and the grounding screw.
4.1.4 Connection of Signal Line of Wire Controller
Caution:
Take great care when carrying out the following connections, so as to avoid malfunction of the air-conditioning
unit because of electromagnetic interference.
The signal line of the wire controller must be separated from the power line and the connecting line between the
indoor unit and the outdoor unit.
In case the unit is installed in a place vulnerable by electromagnetic interference, it is better to use shielded cable
or double-twisted cable as the signal line of the wire controller.
Open the cover of the electric box of the indoor unit.
Pull the signal cable of the wire controller through the rubber ring.
Plug the signal line of the wire controller onto the 4-bit pin socket at the circuit board of the indoor unit.
4.1.5 Cable Connection
Remove the right side plate of the indoor unit and punch through the cable-cross hole. Mount the cable-cross loop.
Fix the power cable and signal control wire with cable clamp. Then, connect to corresponding connector properly.
Mount the front side plate.
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