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Physical Connection
Controller: Chillers with BMS communication capabilities have 2 controllers.
• For OPC5, OPC8, OPC12, and OPC15, the controller for the BMS communication is in a
separate smaller electrical enclosure, not the main electrical box. Wire connections need to be
made with the controller in the smaller electrical enclosure.
• For OPC16 and OPC24, the controller for BMS communication is in the high voltage box, not
the low voltage box. Wire connections need to be made with the controller in the high voltage
box.
Wiring: There are 2 options, 3-wire RS-485 (MSTP) or ethernet TCP/IP. If 3-wire RS-485 is used,
connect wires to TX-, RX+, and GND terminals on the J3 Disp. port (red below). If ethernet TCP/IP is
used, connect an ethernet cable to the RJ45 port (blue below).
Connection Points for BMS
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