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Benchmark Platinum-Edge [II]: Operation-Service Manual
SECTION 7 – BOILER SEQUENCING TECHNOLOGY
7.3.4 Option 4 Outdoor Reset: Modbus Header Temp Sensor &
Modbus Outdoor Temp Sensor
OPTION 4 Instructions: Outdoor Reset, Modbus Header Temp Sensor & Modbus Outdoor
Temp Sensor
NOTE:
Both Header Temp Sensor and Outdoor Temp Sensor must be wired. See the Edge
Controller Manual and (OMM-0139, GF-213) for more information.
ep 1: HEADER TEMP SENSOR WIRING – ANY BOILER
St
1. Connect the Modbus Transmitter 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 Temp Sensor 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 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.
•
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.
HEADER TEMP SENSOR
Step 2: OUTDOOR TEMP 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 Temp 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.
OMM-0137_E • GF-211 •
12/13/2019
MODBUS TRANSMITTER
Continued on next page
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
Page 95 of 153
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