AERCO BMK 6000 Dual Fuel - Manual (Page 29)

Benchmark 6000 DF Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
OMM-0096_0B AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 29 of 219
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03/21/2014
Figure 2-13. I/O Box Terminal Strips
2.10.1 OUTDOOR AIR IN Terminal
An OUTDOOR AIR IN terminal is used for connecting an outdoor temperature sensor (AERCO
Part No. 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 from the boiler. It is connected to the
OUTDOOR AIR IN and AIR SENSOR COMMON terminals of the I/O Box (see Figure 2-13).
Wire the sensor using a twisted shielded pair wire between 18 and 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. 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 cover is used, it must allow for free air
circulation.