CO2 sensor
Carrier Sensors CARRIER CORPORATION ©2021
Installation Guide All rights reserved
44
Mounting location
A CO2 sensor can be wall-mounted or mounted in a return air duct. (Duct installation requires an Aspirator Box
Accessory - Part #33ZCASPCO2.)
Wall mounting
Mount the sensor:
• Near the return air grill to sense the concentration of CO
2
leaving the space
• At least 3 feet (.9 m) from any corner
Do not mount the sensor:
• Where it can have direct breath contact
• In drafty areas such as near supply ducts, open windows, or fans
• Over heat sources
• Where it can be influenced by the supply air. The sensor gives inaccurate readings if the supply air blows
directly onto the sensor or the supply air does not have a chance to mix with the room air before it is drawn
into the return air stream.
NOTE The sensor mounting plate accommodates the NEMA standard 2x4 in. standard single gang electrical box.
However, the sensor can be mounted directly on the wall surface if local codes permit.
Duct mounting
Mount the sensor:
• In a duct that has a diameter or depth of at least 9 inches (22.9 cm)
• At least 6 inches (15.2 cm) upstream or 15 inches (38.1 cm) downstream of a 90-degree turn in the return
air duct. The downstream location is preferred.
• In the center of the duct
• Where at least 1 foot (.3 m) of space in front of the sensor is free of obstruction
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