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3
IM 1248 • BACNET THERMOSTAT
Installing the BACnet Thermostat
To install the controller on a mounting base, do the following:
1 . Turn the Allen screw in the base of the sensor clockwise
until it clears the case (
Figure 2
) .
2 . Swing the BACnet Thermostat away from the mounting
base to remove it .
3 . Route wiring for the BACnet Thermostat through the
mounting base .
4 . Position the base with the embossed UP toward the
ceiling and fasten it directly to a vertical 2 × 4 inch
electrical box .
5 . Connect the wires for the BACnet Thermostat to the
terminals in the mounting base .
6 . Place the top of the sensor over the top of the mounting
base and swing it down over the Allen screw bracket . Be
careful not to pinch any wiring .
7 . Turn the Allen screw counterclockwise until it backs out
of the mounting base and engages the case (
Figure 3
) .
Figure 2: Removing Allen Screw from Base
Figure 3: Reconnecting Allen Screw to Base
Connecting Inputs
The inputs for the BACnet Thermostat are configured for
specific functions and do not require set up in the field. Not all
inputs are required for every application .
Figure 4: Heat Pump Inputs
Remote Space Temperature Sensor (optional)
Connect a 10kΩ, Type II thermistor temperature sensor to
the remote space temperature (RS) input and ground (GND)
terminals . The input includes the internal pull-up resistor .
Follow the instructions supplied with the sensor for installation .
When a remote space temperature input is connected to the
BACnet Thermostat, the remote temperature is used instead of
the internal temperature sensor .
Fan Status Switch (optional)
Connect a Normally Closed Fan Status switch to the Discharge
Air Temperature (DAT) input and ground (GND) terminals .
The input includes the internal pull-up resistor . Follow the
instructions supplied with the switch for installation .
Outside Air Temperature
Connect a 10kΩ, Type II thermistor temperature probe to the
outside air temperature (OAT) input . The input includes the
internal pull-up resistor . Follow the instructions supplied with
the sensor for installation .
Discharge Air Temperature
Connect a 10kΩ, Type II thermistor temperature probe to the
discharge air temperature (DAT) input . The input includes the
internal pull-up resistor . Follow the instructions supplied with
the sensor for installation .
