AERCO BMK 6000 - Manual (Page 141)

Benchmark 6000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 10 – BOILER SEQUENCING TECHNOLOGY
OMM-0086_0D AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 141 of 210
GF-133
Ph.: 800-526-0288
03/20/14
10.3.4 Option 4 - Outdoor Reset with MODBUS Header Sensor AND MODBUS
Outdoor Sensor
NOTE: Both Header Sensor AND Outdoor Sensor must be wired. See the C-More Controller User
Manual, OMM-0032, GF-112 and ProtoNode User Manual, OMM-0080, GF-129 for more information.
Step 1 - Modbus Header Sensor Wiring
1. Using Shielded pair 18 - 22 AWG cable, connect the Temperature Transmitter (AERCO P/N 65169)
terminal Pin B to the RS485+ terminal on the I/O Box of any of the Boiler units, and Pin A of the
Temperature Transmitter to the RS485- terminal on the I/O Box of any of the Boiler units.
2. Using Shielded pair 18 - 22 AWG cable, connect the Modbus Header Temperature Sensor (AERCO
PN 24410) to pins 2 and 3 of the Temperature Transmitter.
3. Install a jumper wire between pins 1 and 2 of the Temperature Transmitter.
NOTES:
• Polarity must be observed for the RS485 connections. The ground for the shield is at the
“SHLD” terminal in the I/O the Box.
• The header sensor must be installed between 2 and 10 feet 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 - Modbus Outdoor Sensor Wiring
1. If you have not already done so when installing the Modbus Header Sensor, use Shielded pair 18 - 22
AWG cable to connect the Temperature Transmitter terminal Pin B to the RS485+ terminal on the I/O
Box of any of the Boiler units, and Pin A of the Temperature Transmitter to the RS485- terminal on the
I/O Box of any of the Boiler units.
2. Using Shielded pair 18 - 22 AWG cable, connect the Modbus Header Temperature Sensor (AERCO
PN 24410) to pins 2 and 3 of the Temperature Transmitter.
3. Install a jumper wire between pins 1 and 2 of the Temperature Transmitter.
NOTES:
• Polarity must be observed for the RS485 connections. The ground for the shield is at the
“SHLD” terminal in the I/O the Box.
• 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 from the boiler.
Temp Sensor PN 24410 Modbus Transmitter I/O Box