GREE Air-ccoled Closed Control Unit Service Manual
7.1.3 Wiring Requirements
◆ Layout of Electric Wires
（1）The layout should comply with relating regulations published and executed by
government.
（2）Rated Voltage and dedicated power supply of the unit are required to apply.
（3）Power cord shall be fixed to avoid the stress on supply terminals.Do not drag or pull
the cable with force.
（4）Line width shall comply with requirements of this manual (referring to the performance
form). Dedicated cables must replace the damaged power cord and connecting wire in time.
（5）All the electrical installation should be carried out by professional personnel and
comply with local relating regulation, also the installation should follow the instructions in this
manual.
（6）The unit must be earthed properly.
（7）A mater air switch and leakage switch for the whole system have to be installed. The
air switch should have the function of stopping the system from short circuit and overload.
（8）Refer to the wiring diagram which pasted on the unit as guidance for wiring.
◆Requirements of Connecting Electric Appliances
（1）All operations for wiring must strictly comply with the wiring diagram of the unit.
（2）Power supply of the unit must be equipped with air switch for general supply by
customers and conductor cross-section is selected according to requirements of electric wiring
diagram of the unit.
（3）Range of Power supply voltage of the unit with three-phase source is 360～400V and
asymmetric degree of three-phase system cannot exceed 3%.
（4）The unit applied three phase source has equipped with reverse phase protection
device. If phases are reversely connected, it cannot work.
（5）The outdoor unit adopt single phase source and its wiring shall also comply with wiring
diagram.
Caution: the unit requires the reliable protective earthing. (There is earthing
symbol in the electric cabinet of the unit ）
◆Earthing Requirements
(1) Since air conditioner is type I appliance, please do conduct reliable earth treatment.
The yellow-green wire inside unit is earth wire, which can not be used for other purpose and
further not be cut off. Don’t fix it with tapping screw to avoid electric shock.
（2）Earthing resistance should match requirements of National Standard GB17790 which
is published by China government.
(3) Users’ power must offer reliable earth terminal. Please don’t connect earth wire to
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