Gree CE52-24/F(C) Owner's Manual page 13

Centralized Controller
Fig. 3.8 Centralized Controller Connected with U-match Unit
Fig.3.9 Centralized Controller Connected with PAC Unit
Wiring Instructions:
(1) The centralized controller is applicable to U-match units (Including PAC units),
One centralized controller can control up to 36 U-match units.
(2) If the centralized controller is to be connected with U-match units which have
COM_BMS ports, connect according to fig.3.7. The controller must connect
with terminal unit of U-match system. Connect the centralized controller's A3
and B3 ports to COM_BMS port on the U-match unit correspondingly with
communication cords. A matching resistance needs to be added with the
communication cords at the A3 and B3 ports. There are two COM_BMS ports
(two core neilsbed and no polarity) on mainboard of U-match unit, one for
centralized controller and another for U-match unit connection.
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