Wiring A Co2 Sensor; Wiring Specifications; To Wire The Co2 Sensor To The Controller - Carrier VVT Zone Installation And Startup Manual

Wiring a CO2 sensor

Part #33ZCSPTCO2LCD-01 (Display model)
Part #33ZCSPTCO2-01 (No display)
Part #33ZCT55CO2 (No display)
A CO sensor monitors carbon dioxide levels. As CO
2
outside air dampers to increase ventilation and improve indoor air quality. These sensors also monitor
temperature using a 10K thermister.
A CO sensor can be wall-mounted or mounted in a return air duct. (Duct installation requires an Aspirator
2
Box Accessory - Part #33ZCASPCO2.)
The sensor has a range of 0–2000 ppm and a linear 4-20 mA output. This is converted to 1-5 Vdc by a 250
Ohm, 1/4 watt, 2% tolerance resistor connected across the zone controller's CO
NOTE Do not use a relative humidity sensor and CO

Wiring specifications

Cable from sensor to controller:
Maximum length:

To wire the CO2 sensor to the controller

#33ZCSPTCO2
Wire the sensor to the controller. See appropriate diagram below.
1
Verify that the RH/CO2 jumper is set to 0-5Vdc on the VVT Zone Controller.
2
Verify the J7 jumper on the sensor is set to 0-5Vdc.
3
VVT Zone Controller
levels increase, the VVT Zone Controller adjusts the
2
sensor on the same zone controller.
2
If <100 ft (30.5 meters)
If >100 ft (30.5 meters)
500 feet (152 meters)
input terminals.
2
22 AWG, unshielded
22 AWG, shielded
17