OPTION 8 Step 1: MODBUS HEADER TEMP SENSOR WIRING – ANY BOILER
1. Connect the Modbus Transmitter terminal Pin B to the RS485+ terminal, and Pin A to the
RS485- terminal on the I/O Board of any Boiler unit, using shielded pair 18 - 22 AWG cable.
2. Connect the shield to any SHLD terminal on the I/O Board.
3. Connect the Header Temp Sensor to pins 2 and 3 of the Modbus Transmitter using
shielded pair 18 - 22 AWG cable.
4. Install a jumper wire between pins 1 and 2 of the Modbus Transmitter.
NOTES:
• Polarity must be observed for the RS485 connections.
• Connect the shield to any SHLD terminal on the I/O Board.
• The Header Temp Sensor must be installed between 2 and 10 feet (0.61 and 3.1m)
downstream of the last boiler in the plant’s supply water header.
• There is no polarity to be observed. The ground for the shield is at the power supply
ground. The sensor end of the shield must be left free and ungrounded.
OPTION 8 Step 2: CONFIGURE AND CONNECT SSD DEVICE (PROTONODE)
1. Connect the ProtoNode per the instructions in one of the ProtoNode FPC N34, FPC-N35
Manuals:
• For FPC-N34 (P/N 64129) or FPC-N35 (P/N 64130), see OMM-0107 (GF-150).
• For FPC-N34 (P/N 64168) or FPC-N35 (P/N 64169), see OMM-0150 (GF-150_B).
OPTION 8 Step 3: CONNECT BOILERS IN DAISY CHAIN
1. Connect the boilers in a daisy chain, as shown below.
Continued on next page
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