Watts Aerco INN 1060N - WHM Modbus Network Wiring

Innovation - Edge [i] Installation, Operation, Maintenance Manual
CHAPTER 8 – WATER HEATER MANAGEMENT
OMM-0143_A • GF-216 • 9/6/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 124 of 170
Figure 8.7: Innovation Water Heater Equipped with Sequencing Valve
8.7.3 WHM Modbus Network Wiring
As previously mentioned, all units being controlled by the WHM will be connected to a RS485
Modbus Network. All Modbus networks are wired in a daisy-chain configuration using a
Manager/Client scenario as shown in Figure 8.7.3.
Figure 8.7.3: Typical Daisy-Chain Modbus/RS485 Network
NOTE:
The WHMS Manager does not necessarily have to be on either end of the Daisy-Chain loop.
Any one of the Edge WHM units included in the Modbus network can be the Manager.
However, it is recommended that you decide which unit will be the Manager and which will be
WHM
MANAGER
# 1
WHM
CLIENT
# 2
WHM
CLIENT
# 3
WHM
CLIENT
# 4
WHM
CLIENT
# 8
BALL VALVE
WITH ACTUATOR
2” (5.1 cm) NPT NIPPLE
2” (5.1 cm) NPT UNION
HEATER DRAIN
VALVE
COLD WATER INLET