Benchmark Platinum-Edge: Operation-Service Manual
SECTION 7 – BOILER SEQUENCING TECHNOLOGY
OMM-0137_D • GF-211
•
7/16/2019
Technical Support
•
(800) 526-0288
•
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7.3.4 Option 4 Outdoor Reset: Modbus Header Sensor & Modbus
Outdoor Sensor
OPTION 4
Instructions: Outdoor Reset, Modbus Header Sensor & Modbus Outdoor Sensor
NOTE:
Both Header Sensor AND Outdoor Sensor must be wired. See the
Edge Controller Manual
and (OMM-0139, GF-213) for more information.
St
ep 1: 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. Using Shielded pair 18 - 22 AWG cable, connect the
Header Temperature Sensor
(P/N
24410
) to pins 2 and 3 of the
Modbus Transmitter
.
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 or 8.
•
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 2: OUTDOOR SENSOR WIRING
1. If you have not already done so, complete step 1 of the instructions above to connect the
Modbus Transmitter
to the I/O Board.
2. Connect the
Outdoor Temperature Sensor
(P/N
61048
) to
Pins 5
and
6
of the
Modbus
Transmitter
using a Shielded pair 18 - 22 AWG cable.
3. Install a jumper wire between
Pins 4
and
5
on the
Modbus Transmitter
.
MODBUS TRANSMITTER
15 BST RS485–
HEADER TEMP SENSOR
(P/N
24410)
13 BST RS485+
3 Shield
I/O BOARD STRIP J3
15 BST RS485–
13 BST RS485+
3 Shield
MODBUS TRANSMITTER
OUTDOOR TEMP SENSOR
(P/N
61048)
I/O BOARD STRIP J3
