Gree A Series Service Manual page 100

(2)As shown in the diagram above, CN4 on the display panel is connected to a CN25 on a
main board of any unit by a four-core four-pin shielded communication line whose ground
wire will be linked to the terminal near the main board.
(3)The power lines should be connected to L1, L2, L3, and N at XT1 through a piece of four-
core rubber sleeve cable as shown in the figure above.
(4)There are two solutions for remote monitoring.
1) Install the remote monitoring software at the PC.
2) Based on GREE provided Modbus protocol, the user can do second development to
this protocol.
Note: those enclosed by the dotted lines indicate the remote monitoring equipment. When
the quantity of the display panel exceeds 30 or length of the communication line exceeds
800m, extra photoelectric relay is required. The photoelectric relays, communication lines
(class 5 twist pairs), converters are optional. PC should be prepared by the user
themselves.
A Series Modular-type Air-cooled (Heat Pump) Chiller
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