Bst Implementation Instruction; Option 1 Constant Setpoint: Direct Wired Header Temp Sensor - Watts AERCO Benchmark BMK750 Operation And Service Manual

Benchmark with Edge [I]: Operation-Maintenance Manual
SECTION 7 – BOILER SEQUENCING TECHNOLOGY

7.3 BST Implementation Instruction

There are 8 BST implementation options, described below. The instructions for each refer to I/O
board connections described in Section 2.11.1 in the Benchmark 750-6000 with Edge [i]: Install-
Startup Manual (OMM-0144, GF-217).
All instructions in the sections below refer to one or more of the following components:
•
Modbus Transmitter:
o P/N 24444-1 includes PT1000 Header Temp Sensor P/N 61058.
o P/N 24444-3 includes PT1000 Header Temp Sensor P/N 61058, box and power supply.
•
Header Temp Sensor, either:
o P/N 61040 (BALCO) if connecting directly to I/O board.
o P/N 61058 (PT1000) dual bead, if connecting to Modbus Transmitter
•
Outdoor Sensor, either:
o P/N 61047 (BALCO) if connecting directly to I/O board.
o P/N 61060 (PT1000) if connecting to Modbus Transmitter.

Option 1 Constant Setpoint: Direct Wired Header Temp Sensor

7.3.1
OPTION 1 Instructions: Constant Setpoint with Direct Wired Header Temp Sensor
HEADER TEMP SENSOR WIRING – BST MANAGER Unit
Step 1:
1. On the BST Manager unit, connect the Header Temp Sensor 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 Temp 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 Temp 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: CONFIGURATION
On All Boiler:
Main Menu → Advanced Setup → BST Cascade → Cascade
1. Go to:
•
Set the Unit Mode parameter to BST Client.
OMM-0145_A99 • GF-218 •
HEADER TEMP SENSOR
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
9/18/2019
I/O BOX
Configuration:
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