System Communication - Gree GMV Series Owner's Manual

(4) The above sectional area is suitable for a maximum distance of 15m (49-1/5in.). If it's over 15m (49-1/5in.),
sectional area must be expanded to prevent overload current from burning the wire or causing fire hazard.
(5) Specification of circuit breaker is based on the working condition where the ambient temperature of circuit
breaker is 40℃(104℉). If working condition is different, please adjust the specification according to national
standard.
(6) The air switch should include magnetic trip function and thermal trip function so that system can be protected
from short circuit and overload.
(7) An all-pole disconnection switch having a contact separation of at least 3mm (1/8in.) in all poles should be
connected in fixed wiring.
4.6.3 Connection of power cord
(1) Before obtaining access to terminals, all supply circuits must be disconnected.
(2) If units are type I electrical appliances, they must be reliably grounded.
(3) Ground resistance must be in accord with requirements of local standard.
(4) The green-yellow wire within units are ground wire. Do not use it for other purposes. Nor should it be cut off or
secured by tapping screws. Otherwise, it may cause electric shock.
(5) Power supply at user side must have reliable ground terminal. Do not connect ground wire to the following
places:
1) Water pipe.
2) Gas pipe.
3) Drainage pipe.
4) Other places that are considered by professionals as unreliable.
(6) Power cord and communication wire should be separated, with a distance of more than 20cm (7-7/8in.).
Otherwise, system's communication may not work well.
Steps of power cord connection:
(1) Knock off the cross-through opening that's used for leading the external power cord, with
the cross-through rubber ring on the opening. Then lead the cable through the opening.
Connect L1, L2, L3 of power cord and ground wire separately to the positions on wiring
board (for power supply) that are marked with L1, L2, L3 and the ground screw nearby.
(2) Fasten the power cord with cable tie.
(3) Lay the power cable and communication cable for the ODU according to the marker of
external connection circuit diagram.

4.7 System Communication

4.7.1 Communication system include:
(1) Communication among outdoor basic modules.
(2) Communication between ODU and IDU.
(3) Communication among IDUs.
(4) Communication between IDU and wired controller.
(5) Connection between IDU and light board receiver.
(6) Communication between different refrigeration systems.
(7) Graphics of general communication connection.
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GMV DC Inverter VRF