Benchmark Platinum-Edge: Operation-Service Manual
SECTION 7 – BOILER SEQUENCING TECHNOLOGY
OMM-0137_D • GF-211
•
7/16/2019
Technical Support
•
(800) 526-0288
•
Mon-Fri, 8 am - 5 pm EST Page 97 of 146
7.3.8 Option 8 Remote Setpoint: MODBUS Header Sensor & MODBUS
Setpoint Drive
OPTION 8
Instructions: Remote Setpoint, Modbus Header Sensor & Modbus Setpoint Drive
Step 1:
MODBUS
HEADER SENSOR WIRING – ANY BOILER
1. Connect the
Modbus Transmitter
(P/N
65169
) terminal
Pin B
to the I/O Board strip
J3
,
terminal
13
(
BST RS485+)
and
Pin A
to terminal
15
(
BST RS485–
) on any of the Boiler
units using Shielded pair 18 - 22 AWG cable.
2. Connect the shield to any
Shield
terminal, such as terminal 3 or 8 on strip
J3
.
2. Connect the
Header Temperature Sensor
(P/N
24410
) to pins 2 and 3 of the
Modbus
Transmitter
using Shielded pair 18 - 22 AWG cable.
3. Install a jumper wire between pins 1 and 2 of the
Modbus Transmitter
.
NOTES:
•
Polarity must be observed for the RS485 connections.
•
Ground the shield to any
Shield
terminal on the I/O Board (such as Terminal 3).
•
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.
•
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.
Step 3: OPTION 8 CONFIGURATION
On All Boiler:
1. Go to:
Main Menu
Advanced Setup
BST Cascade
Cascade Configuration
:
•
Set the
Unit Mode
parameter to
BST Client
.
2. Go to:
Main Menu
Advanced Setup
BST Cascade
Application Configuration
:
•
Set the
Unit Address
parameter to the communication address of the unit.
Continued on next page
MODBUS TRANSMITTER
15 BST RS485–
HEADER TEMP SENSOR
(P/N
24410)
13 BST RS485+
3 Shield
I/O BOARD STRIP J3
