Gree Ultra Heat GMV-V72W/A-F, Service Manual

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Ultra Heat GMV VRF Technical Service Manual REMOTE CONTROL
209
(1) Communication system of gateway consists of:
1) Communication between gateway and air conditioner unit
Type Length m(feet) Wire size Remarks
Light/Ordinary
polyvinyl chloride
sheathed cord
L
≤
500(1640)
≥
2
×
AWG18
1. If the wire diameter is enlarged to 2
×
AWG16, the total
communication line length can reach 800 m (2625 feet).
2. The cord shall be Circular cord (the cores shall be twisted
together).
3. If unit is installed in places with intense magnetic field or
strong interference, it is necessary to use shielded wire.
NOTE: The length of the CAN2 bus connecting the gateway with master ODUs should not exceed
500 m.
2) Communication between gateway with electric meter.
Type Size Applicable Standard Remarks
Category five twisted
pairs
24AWG (20.6 mm) TIA/EIA-568-A
An optoelectronic repeater is required when the
communication distance is more than 800 m.
(2) The way of communication Connection:
1) CAN2 connection between gateway and master control outdoor unit;
2) 485 connection between gateway and electric meter.
All communication connection wire of gateway must adopt series connection; start connection is not
allowable.
(3) Steps of Communication Connection:
Introduction of communication
interface please refer to ―2.2.1 Functions_(3) Communication
Interfaces‖.