WIRING THE IO
Wiring the Universal Inputs
The FBVI-2U4-4T comes with 5 universal inputs. U/I-8 is dedicated to the internal airflow sensor. U/I-1
through U/I-4 is used for wiring in-room sensors, setpoint adjust, discharge air sensors, CO₂ sensors,
relative humidity sensors, window, and motion sensors, depending on the application. The sequences
for this wide range of applications are available within the preloaded strategy.
• U/I – 1 will typically be where the room temperature sensor is wired. This input is pre-configured to
support a 10K Type III thermistor.
Note: Room sensors that short the thermistor for push-button occupancy are supported with this controller.
• U/I – 2 will typically be where the room setpoint adjusts is wired. This input is pre-configured to
support a 5K POT. It can also be set up for an occupancy sensor or window sensor.
• U/I – 3 is a dedicated input that has been configured to read a thermistor. In the pre-loaded
strategy, this input is used for a discharge air temperature sensor.
• U/I – 4 is configured as a voltage input. This input can be used for wiring in a CO₂ sensor or relative
humidity sensor. It can also be set up for an occupancy sensor, window sensor, or a VAV fan
status.
Note: For CO₂ or relative humidity sensors it must be a 0
…
10 Vdc sensor type. To change the span for the CO₂
sensor that is installed, adjust the following:
o minCO2Range (A278) Low range of the sensor.
o maxCO2Range (A280) High range of senor.
To adjust the span for the relative humidity sensor that is installed, adjust the following:
o minHumidityRange (A251) Low range of the sensor.
o maxHumidityRange (A305) High range of senor.
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