NOTE:
Refer to this image for connections rather than the silkscreen labels shown on the board.
Figure 2-11: I/O Box Terminal Strips
2.11.1 Outdoor Air & Air Sensor Common
An outdoor temperature sensor (P/N 61047) is required for the Outdoor Air Reset operating
mode. It can also be used with another mode if it is desired to use the outdoor sensor
enable/disable feature, which allows the boiler to be enabled or disabled based on the outdoor air
temperature.
The factory default for the outdoor sensor is OFF. To enable the sensor, see the Outdoor Air
Temp Sens parameter in the Main Menu → Advanced Setup → BST Cascade → Cascade
Configuration menu.
The outdoor sensor may be wired up to 200 feet (61m) from the boiler. It is connected to the
OUTDOOR AIR and AIR SENSOR COMMON terminals of the I/O board (Figure 2-11). 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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