Outside Air Temperature Sensor
Installation and Operation
Specifications subject to change without notice.
2 of 2
Catalog No. 11-808-633-01
#20909 – 3/2/18
Mounting
Sensor location is critical to good performance. The sensor must be mounted in the shade away from building
windows, doors or vents. It should never be in direct sunlight or you will have higher than expected temperature
readings by as much as +30%. The ideal shaded location in the Northern hemisphere is on the North side of the
building. In the Southern hemisphere, the South side of the building is ideal.
The sensor shield and probe should always point down and be mounted between four feet above the ground/roof and
one foot minimum below the eave. (
NOTE
Four feet keeps the sensor above the ground or roof top radiation and one
foot under the eave prevents measurement of trapped heat from under the eave.)
Drill the mounting holes and mount as shown in the Figure 2. Snug up the mounting screws to ensure that the foam
backing compresses to about 50% of its thickness to make a gasket type seal against the wall surface.
Route the wires into the box and terminate with sealant filled connectors to prevent water from attacking the
connection, thereby preventing costly callbacks. Best practice is to caulk the wiring hole after the wiring is installed.
Close the cover of the enclosure and secure with provided cover screws.
Wiring and Termination
Carrier
recommends using twisted pair of at least 22AWG for all wire connections. Larger gauge wire may be required
for long runs. All wiring must comply with the National Electric Code (NEC) and local codes. Do NOT run this device’s
wir- ing in the same conduit as high or low voltage AC power wiring. Tests show that inaccurate signal levels are
possible when AC power wiring is present in the same conduit as the sensor wires.
Diagnostics
Possible Problem:
Controller reports higher or
lower than actual
temperature
Possible Solutions:
- Confirm the input is set up correctly in the front end software.
- Check wiring for proper termination and continuity (shorted or open).
- Disconnect wires and measure sensor resistance and verify the “Sensor” output is
correct.
To Controller
Analog Input (AI)
(No Polarity)
Figure 3:
2 Wire Lead Wire Termination for Thermistor
To Controller
Analog Input (AI)
(No Polarity)
Sensor
