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Benchmark with Edge [I]: Operation-Maintenance Manual
SECTION 7
– BOILER SEQUENCING TECHNOLOGY
OMM-0145_A99
• GF-218 • 9/18/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page
111
of
157
7.3.3
Option 3 Outdoor Reset: Direct Wired Header Temp Sensor & Direct Wired
Outdoor Sensor
OPTION 3
Instructions: Outdoor Reset, Direct Wired Header Temp Sensor & Outdoor Sensor
NOTE:
Both
Header Temp Sensor
and
Outdoor Sensor
must be wired. See the
Edge [i]
Controller Manual
(OMM-0141, GF-213-B) 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 Feed Forward
(FFWD) terminals on the P-1 Harness via the terminal block labeled
Header Temp sensor
on the I/O Board.
2. Ground the shield to any
SHLD
terminal on the I/O Board.
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. Ground the shield to the
Shield
terminal on the I/O
Board. The sensor end of the shield must be left free and ungrounded.
Step 2: DIRECT WIRED
OUTDOOR SENSOR WIRING
– BST MANAGER Unit
1. On the
BST Manager
Unit, connect the
Outdoor Temp Sensor
to the
OUT
and
COM
terminals on the I/O Board.
2. Connect the shield to any
SHLD
terminal on the I/O Board.
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.
•
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
HEADER TEMP SENSOR
I/O BOARD
I/O BOARD