Gree NCHS1B(U) - Conenct Communication Wire of Indoor Unit and Outdoor Unit

GMV5 HR Heat Recovery Cooling and Heating Mode Exchanger
29
One-to-eight Cooling and Heating Mode Exchanger
Fig.5.8
5.3 Conenct Communication Wire of Indoor Unit and Outdoor Unit
(1) Open electric box cover of indoor unit.
(2) Pass the communication wire through rubber ring.
(3) Connect communication wire to wiring board OD(D1
，
D2) of outdoor unit of mode exchanger.
(4) Connect communication wire lead from D1and D2 terminal of 4-bit wiring board of indoor unit to
wiring board ID1(1D1
，
1D2)of indoor unit of mode exchanger; ID2(2D1
，
2D2
……
ID-n(nD1
，
nD2)
，
n
≤
8, As shown in fig.5.11
Fig. 5.9 Fig. 5.10
(5) Fix the communication wire with wire-fixing clamp.
(6) In order to ensure the reliability of communication between indoor unit and outdoor unit, add a
matched resistance (in the packing bag) on the wiring board at the last connected mode
exchanger. The matched resistance should be connected among terminal screw D1 and D2.
(7) When mode converter connects to the indoor unit with capacity of over 48500Btu/h, it only
requires to connect the indoor unit to one of the two corresponding branch. Note that the first
place in the SA2 dial code for corresponding mainboard of the two branches is dialed to number
end.