Bst Implementation Instruction; Option 1 - Constant Setpoint With Direct Wired Header Sensor - Watts Aerco BENCHMARK 750 User Manual

Benchmark 750 – 1000 Boiler User Manual - INTERNATIONAL
CHAPTER 9. BOILER SEQUENCING TECHNOLOGY

9.3 BST Implementation Instruction

9.3.1 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 (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 Heating 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 Heating Boilers:
1. Go to the Configuration menu item and set the BST Menu item to Enabled.
2. Go to the Boiler Sequencing Menu item 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 Boiler Sequencing Menu item of the desired Master unit and set the BST Mode item to
BST MASTER.
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11/03/2016
Header Temp Sensor I/O Box
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
OMM-0119_0A
GF-130-I