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Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 6 – BOILER SEQUENCING TECHNOLOGY
6.3 BST Implementation Instruction
6.3.1 OPTION 1 - Constant Setpoint With Direct Wired Header Sensor
OPTION 1 - Constant Setpoint With Direct Wired Header Sensor
Instructions
Step 1: Direct Wired Header Sensor Wiring
1. On the MANAGER Unit, Connect the Header Temperature Sensor (P/N 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 (0.61 and 3.1m)
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.
TEMP SENSOR P/N 61040
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 Boiler Sequencing Menu and set the BST Mode item to BST Client (for now).
On MANAGER 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 Boiler Sequencing Menu of the Manager unit and set the BST Mode item to BST
MANAGER.
OMM-0121_D • GF-205 • 5/9/2019
HEADER TEMP SENSOR I/O BOX
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
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