ZS Sensors
Carrier Sensors CARRIER CORPORATION ©2021
Installation Guide All rights reserved
6
CO2 sensor installation
IMPORTANT Do not install ZS CO2 sensors in continuous occupancy applications. For a ZS CO2 sensor to
maintain accuracy, it must be installed only in a zone that is unoccupied for at least 4 hours a day with enough air
movement during the unoccupied period to return CO2 to background levels.
A ZS sensor with CO2 uses Automatic Background Calibration which waits for the lowest value in a 24-hour period
that deviates no more than 40PPM for at least 15 minutes, and assigns that value to the 400PPM baseline. This
daily Automatic Background Calibration may take up to 21 days to fully calibrate the sensor.
After installation, a ZS sensor with CO2 must be powered up for one hour before it attains accurate readings.
NOTE Dropping a sensor can upset the calibration, and it may require 21 days to return to our stated accuracy.
Rnet Configuration
An Rnet can consist of the following devices wired in a daisy-chain configuration:
• Up to 15 ZS Sensors
NOTE You cannot have more than 5 sensors per control program
• Up to 5 ZS sensors and 1 Equipment Touch device
NOTE You cannot have SPT sensors and ZS sensors on the same Rnet.
Rnet wiring specifications
NOTE Use the specified type of wire and cable for maximum signal integrity.
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