Gree Ultra Heat GMV-VQ72W/A-F, Service Manual

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Ultra Heat GMV VRF Technical Service Manual_Heat Recovery Serial INSTALLATION
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Method 2: Use different types of cables.
The diameter of the power cable is larger than that of the communication cable. Alternatively, adopt
three cores or more for the power cable and two cores for the communication cable.
Elaborate the method with the installation personnel on site no matter which method is adopted.
2 INSTALLATION OF THE POWER CABLE
2.1 Precautions
(1) The air conditioning unit is category 1 electrical appliance which requires reliable grounding.
WARNING: be sure to have authorized electrical engineers do the electric work using special
circuits in accordance with regulations and this installation manual. If power supply circuit has a lack of
capacity or electric work deficiency, it may cause an electric shock or fire.
(2) The grounding resistance must comply with local rules and regulations.
CAUTION: be sure to correct the outdoor unit to earth. Do not connect earth line to any gas pipe,
liquid pipe, lightening rod or telephone earth line. If earth is incomplete, it may cause an electric shock.
(3) The yellow green cable inside the air conditioning unit is a grounding cable. It cannot be used
for other purposes or be cut off. Do not fix it with tapping screws. Otherwise, an electric shock may be
caused.
(4) A reliable ground terminal must be provided for the power. Do not connect the grounding cable
to any of the following:
a) Water pipes; b) Gas pipes; c) Drainage pipe; d) Other places deemed as unreliable.
(5) The power cable and the communication cable must be laid separately with a distance of
greater than 200mm (7.87inch). Otherwise, the communication of the unit will be affection.
CAUTION: power cable and communication cable cannot come across and they should be at least
200mm (7.87 inch) away from each other, otherwise, unit may work abnormally.
2.2 Requirements on Power Cable Configuration
Configure a circuit breaker to each unit for short circuit and overload protection. In addition,
configure a general circuit breaker to both the indoor and ODUs to switch on or switch off the general