Option 3 Outdoor Reset: Direct Wired Header Sensor & Direct Wired Outdoor Sensor - Watts Aerco Benchmark Series Operation And Service Manual

Benchmark Platinum-Edge: Operation-Service Manual
SECTION 7 – BOILER SEQUENCING TECHNOLOGY
7.3.3 Option 3 Outdoor Reset: Direct Wired Header Sensor & Direct
Wired Outdoor Sensor
OPTION 3 Instructions: Outdoor Reset, Direct Wired Header Sensor & Outdoor Sensor
NOTE:
Both Header Sensor and Outdoor Sensor must be wired. See the Edge Controller Manual
(OMM-0139, GF-213) for more information.
Step 1: DIRECT WIRED HEADER SENSOR WIRING – MANAGER Unit
1. On the Manager unit, connect the Header Temperature Sensor (P/N 24410) 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 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 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
(P/N 24410)
Step 2: DIRECT WIRED OUTDOOR SENSOR WIRING – MANAGER Unit
1. On the Manager Unit, connect the Outdoor Temperature Sensor (P/N 61048) to the I/O
board terminal strip J3, terminals 1 (Outside Temp +) and 2 (Outside Temp -). Connect the
shield to terminal 3 (Shield).
NOTES:
•
Twisted shielded pair 18 - 22 AWG cable is recommended for header sensor wiring.
There is no polarity to be observed. The sensor end of the shield must be left free and
ungrounded.
•
When mounting the Outdoor sensor, it must be located 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
sensor may be wired up to 200 feet (61m) from the boiler.
OUTDOOR TEMP SENSOR
(P/N 61048)
OMM-0137_D • GF-211 • 7/16/2019
I/O BOARD, STRIP J3
Continued on next page
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 -
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