Option 3 Outdoor Reset: Direct Wired Header Temp Sensor & Direct Wired Outdoor Temp Sensor - Watts AERCO Benchmark OMM-0136 Operation And Service Manual

Benchmark Platinum-Edge [II]: Operation-Service Manual
SECTION 7 – BOILER SEQUENCING TECHNOLOGY
7.3.3 Option 3 Outdoor Reset: Direct Wired Header Temp Sensor &
Direct Wired Outdoor Temp Sensor
OPTION 3 Instructions: Outdoor Reset, Direct Wired Header Temp Sensor & Outdoor Temp
Sensor
NOTE:
Both Header Temp Sensor and Outdoor Temp Sensor must be wired. See the Edge
Controller Manual (OMM-0139, GF-213) for more information.
Step 1: DIRECT WIRED HEADER TEMP SENSOR WIRING – BST MANAGER Unit
1. On the BST Manager unit, connect the Header Temp Sensor to the I/O board terminal
strip J3, terminals 4 (Supply Header +) and 5 (Supply Header -).
2. Connect the shield to any Shield terminal, such as terminal 3 or 8 on strip J3.
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 Shield terminal
on the I/O the board. The sensor end of the shield must be left free and ungrounded.
HEADER TEMP SENSOR
Step 2: DIRECT WIRED OUTDOOR TEMP SENSOR WIRING – BST MANAGER Unit
1. On the BST Manager unit, connect the Outdoor Temp Sensor to the I/O board terminal
strip J3, terminals 1 (Outside Temp +) and 2 (Outside Temp -).
2. Connect the shield to any Shield terminal, such as terminal 3 or 8 on strip J3.
NOTES:
•
Twisted shielded pair 18 - 22 AWG cable is recommended for Header Temp Sensor
wiring. There is no polarity to be observed. The sensor end of the shield must be left
free and ungrounded.
•
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.
OUTDOOR TEMP SENSOR
OMM-0137_E • GF-211 •
12/13/2019
I/O BOARD, STRIP J3
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
3 Shield
4 Supply Header+
5 Supply Header-
I/O BOARD STRIP J3
3 Shield
1 Outside Temp +
2 Outside Temp -
Page 93 of 153