Benchmark 1500 - 2000 Boilers
CHAPTER 9. BOILER SEQUENCING TECHNOLOGY
OMM-0097_0E AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 129 of 182
GF-142 Ph.: 800-526-0288 10/01/2015
9.3.8 Option 8 - Remote Setpoint with MODBUS Header Sensor AND MODBUS
Setpoint Drive
NOTE! Both Header Sensor AND ProtoNode SSD Device must be wired. See the C-More Controller User
Manual, OMM-0032, GF-112 and ProtoNode User Manual, OMM-0080, GF-129 for more information.
Step 1: MODbus Header Sensor
1. Using Shielded pair 18 - 22 AWG cable, Connect the Temperature Transmitter (P/N 65169) terminal
Pin B to the RS485+ terminal on the I/O Box of any of the Boiler units, and Pin A of the Temperature
Transmitter to the RS485- terminal on the I/O Box of any of the Boiler units.
2. Using Shielded pair 18 - 22 AWG cable, connect the Modbus Header Temperature Sensor (P/N
24410) to pins 2 and 3 of the Temperature Transmitter.
3. Install a jumper wire between pins 1 and 2 of the Temperature Transmitter.
NOTES:
• Polarity must be observed for the RS485 connections. The ground for the shield is at the “SHLD”
terminal in the I/O the Box.
• The header 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.
Step 2: Remote Setpoint with Network
1. Configure and Connect the SSD Device (ProtoNode) per the AERCO Manual (GF129).
Temp Sensor PN 24410 Modbus Transmitter I/O Box
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