Watts AERCO Benchmark OMM-0136 Operation And Service Manual page 96

Benchmark Platinum-Edge [II]: Operation-Service Manual
SECTION 7 – BOILER SEQUENCING TECHNOLOGY
OPTION 4 Instructions: Outdoor Reset, Modbus Header Temp Sensor & Modbus Outdoor
Temp Sensor
OUTDOOR TEMP SENSOR
(P/N 61048)
NOTES:
•
Polarity must be observed for the RS485 connections. The ground for the shield is at
the Shield terminal on the I/O the board.
•
The Outdoor Temp Sensor must be mounted on the North side of the building where
an average outside air temperature is expected. The sensor must be shielded from
direct sunlight as well as impingement by the elements. The Outdoor Temp Sensor
may be wired up to 200 feet (61m) from the boiler.
•
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 4 CONFIGURATION
On All Boiler:
1. Go to: Main Menu
•
Set the Unit Mode parameter to BST Client.
2. Go to: Main Menu
•
Set the Unit Address parameter to the communication address of the unit.
On the BST Manager only:
Main Menu → Advanced Setup → BST
1. Go to
in each menu in the table below.
Menu/Screen Name
Cascade
Configuration
Application
Configuration
Cascade
Communication
OMM-0137_E • GF-211 •
12/13/2019
MODBUS TRANSMITTER
→ →
Advanced Setup
→ →
Advanced Setup
Parameters
Unit Mode
Hdr Temp Sensor
Sensor Comm Address
Hdr Temp Point
Application
SH Operating Mode
Outdoor Temp Sensor
Sensor Comm Address
Outdoor Temp Point
Plant Setpoint
Min Address
Max Address
Cascade Baud Rate
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
3 Shield
13 BST RS485+
15 BST RS485–
I/O BOARD STRIP J3
→
BST Cascade Cascade
→
BST Cascade Cascade
Cascade, set the Parameters to the Values
Values
BST Manager
Network
240
14
Space Heating
Outdoor Reset
Outdoor Sensor
240
15
Header temperature required for the cascade
The minimum unit address in the cascade
The maximum unit address in the cascade
The baud rate for the cascade.
Configuration:
Communication:
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