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ZS Sensors
Carrier Sensors
CARRIER CORPORATION ©2021
Installation Guide
All rights reserved
6
CO2 sensor installation
IMPORTANT
Do not install ZS CO
2
sensors in continuous occupancy applications. For a ZS CO
2
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 CO
2
to background levels.
A ZS sensor with CO
2
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 CO
2
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.
Description
4 conductor, shielded or unshielded, CMP, plenum rated cable
Conductor
22 AWG (7x0096) bare copper
Maximum length
500 feet (152 meters)
Insulation
Low-smoke PVC (or equivalent)
Color Code
Black, white, green, red
Shielding
If shielded, Aluminum/Mylar shield (100% coverage) with TC drain wire
UL temperature rating
32
–
167°F (0
–
75°C)
Voltage
300 Vac, power limited
Listing
UL: NEC CL2P, or better
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