Installation
24 RTU Open
3 Connect to J2 wires 3 and 4.
4 Verify your sensor readings.
Wiring a CO2 sensor
Part #33ZCSENCO2 (Display model)
Part #33ZCT55CO2 (No display)
Part #33ZCT56CO2 (No display)
A CO
2
sensor monitors carbon dioxide levels. As CO
2
levels increase, the RTU Open adjusts the outside air
dampers to increase ventilation and improve indoor air quality. A CO
2
sensor can be wall-mounted or
mounted in a return air duct. Duct installation requires an Aspirator Box Accessory (Part #33ZCASPCO2).
The sensor has a range of 0–2000 ppm and a linear 4-20 mA output. The CO2 sensor’s power requirements
exceed what is available at
J4 - 1 and 4. Provide a dedicated 24Vac transformer or DC power supply
Wiring specifications
Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded
If >100 ft (30.5 meters) 22 AWG, shielded
Maximum length: 500 feet (152 meters)
To wire the CO2 sensor to the controller
1 Wire the sensor to the controller. See appropriate diagram below.
2 Install a field-supplied dedicated 24 Vac transformer or DC power supply.
3 Wire the sensor to the controller.
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