Instruction Manual

Benchmark 750/1000 Boiler
CHAPTER 10. BOILER SEQUENCING TECHNOLOGY
OMM-0082_0J AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 127 of 192
GF-130 Ph.: 800-526-0288 05/21/2014
10.3.3 Option 3 - Outdoor Reset with DIRECT WIRED Header Sensor AND DIRECT
WIRED 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 - Direct Wired Header Sensor Wiring
1. On the MASTER Unit, connect the Header Temperature Sensor (AERCO PN 61040) to the
Feed Forward (FFWD) terminals on the P-1 Harness Via the terminal block labeled “Header
Temp sensor” in the I/O Box.
NOTES: The header sensor must be installed between 2 and 10 feet 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
“SHLD” terminal in the I/O the Box. The sensor end of the shield must be left free and
ungrounded.
Step 2 - Direct Wired Outdoor Sensor
1. On the MASTER Unit, Connect the Outdoor Temperature Sensor (AERCO PN 123525) to
the “OUT” and “COM” terminals in the I/O Box.
NOTES:
• Twisted 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 “SHLD” terminal in the I/O
the Box. 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 from the boiler.
Temp Sensor PN 123525
Temp Sensor PN 61040 Header Temp Sensor I/O Box