Benchmark 1500 - 2000 Boilers
CHAPTER 2 – INSTALLATION
Page 28 of 182 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0097_0E
10/01/2015 Ph.: 800-526-0288 GF-142
Figure 2-12: I/O Box Terminal Strips
2.10.1 Outdoor Air In (OUT) & Air Sensor Common (COM)
The OUTDOOR AIR IN terminal is used for connecting an outdoor temperature sensor (P/N
GM-123525) as required primarily for the INDOOR/OUTDOOR RESET mode of operation. It
can also be used with another mode if it is desired to use the outdoor sensor enable/disable
feature. This feature allows the boiler to be enabled or disabled based on the outdoor air
temperature.
The factory default for the outdoor sensor is DISABLED. To enable the sensor and/or select an
enable/disable outdoor temperature, see the Configuration menu in Chapter 3.
The outdoor sensor may be wired up to 200 feet (61m) from the boiler. It is connected to the
OUTDOOR AIR IN and AIR SENSOR COMMON terminals of the I/O PCB (Figure 2-12). Wire
the sensor using a twisted shielded pair wire from 18 to 22 AWG. There is no polarity to
observe when terminating these wires. The shield is to be connected only to the terminals
labeled SHIELD in the I/O Box PCB. The sensor end of the shield must be left free and
ungrounded.
When mounting the 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. If a shield is used, it must allow for free air circulation.
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