Rheem 953060DP Owner's Manual And Installation Instructions page 60

CONNECTIONS - ELECTRICAL
Building Management Systems (BMS/BAS)
Each water heater can be connected to a BMS or BAS system via Modbus
RS485 provided or using optional interface cards (BACnet MS-TP or BACnet
TCP/IP Ethernet), available as an accessory.
Based on site requirement, a suitable interface card needs to be connected to
Rheem IQ control panel as shown in the diagram below.
In multi- compressor models, there will be multiple control boards. The BMS
MUST be connected to the first control board which is the one located in the top
left hand corner.
Insert the BMS card into the connector for master heat pump, taking care that
the card is firmly placed as shown in red circle.
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