Option 8 - Remote Setpoint With Modbus Header Sensor And Modbus Setpoint Drive - Aerco BENCHMARK 2500DF User Manual

CHAPTER 10. BOILER SEQUENCING TECHNOLOGY
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.
Temp Sensor PN 24410
Step 2: Remote Setpoint with Network
1. Configure and Connect the SSD Device (ProtoNode) per the AERCO Manual (GF129).
Step 3: Configure ALL C-More Units
On ALL Boilers:
1. Go to the Configuration Menu and set the BST Menu item to Enabled.
2. Go to the BST Menu and set the BST Mode item to BST Slave (for now).
On MASTER only:
3. Go to the BST Setpoint item and enter the failsafe Setpoint.
4. Go to the BST Setup Menu item and set to Enabled.
5. Go to the BST Setpoint Mode item and select Remote Setpoint.
6. Go to the BST Remote Signal and select either Network.
7. Go to the Head Temp Source item and select Network.
8. Go to the Header Temp Addr item and enter the Modbus Address (240).
9. Go to the Header Temp Point item and enter the Modbus Point (14).
When ALL C-More units have been configured:
10. Go to the BST Menu of the desired Master unit and set the BST Mode item to BST MASTER.
OMM-0099_0A
GF-145
Benchmark 2500DF-3000DF
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
Modbus Transmitter
Page 137 of 234
PR1: 05/21/2014