Instruction Manual

Benchmark 750/1000 Boiler
CHAPTER 10. BOILER SEQUENCING TECHNOLOGY
Page 136 of 192 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0082_0J
05/21/2014 Ph.: 800-526-0288 GF-130
10.3.8 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 (AERCO 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
(AERCO PN 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 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