Instruction Manual

Benchmark 750/1000 Boiler
CHAPTER 10. BOILER SEQUENCING TECHNOLOGY
OMM-0082_0J AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 125 of 192
GF-130 Ph.: 800-526-0288 05/21/2014
10.3 BST IMPLEMENTATION INSTRUCTION
10.3.1 Option 1 - Constant Setpoint with DIRECT Wired Header Sensor
Step 1: Direct Wired Header Sensor Wiring
1. On the MASTER Unit, Connect the Header Temperature Sensor (AERCO PN 61040) to the
Feed Forward (FFWD) terminals on the P-1 Harness Via the terminal block labeled “Header
Temp sensor” in the I/O Box.
NOTES:
• The header sensor must be installed between 2 and 10 feet downstream of the LAST boiler
in the plant’s supply water header.
• Shielded pair 18 - 22 AWG cable is recommended for header sensor wiring. There is no
polarity to be observed. The ground for the shield is at the “SHLD” terminal in the I/O the
Box. The sensor end of the shield must be left free and ungrounded.
Step 2: 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 desired Setpoint.
4. Go to the BST Setup Menu item and set to Enabled.
5. Go to the BST Setpoint Mode item and select Constant Setpoint.
6. Go to the Head Temp Source item and select FFWD Temp.
When ALL C-More units have been configured:
7. Go to the BST Menu of the desired Master unit and set the BST Mode item to BST
MASTER.
Temp Sensor PN 61040 Header Temp Sensor I/O Box