To Wire The Co2 Sensor To The Controller - Carrier VAV Zone II Installation And Startup Manual

Installing the VAV Zone II

To wire the CO2 sensor to the controller

Part #33ZCSPTCO2LCD-01 (Display model)
Part #33ZCSPTCO2-01 (No display)
Part #33ZCT55CO2 (No display)
A CO sensor monitors carbon dioxide levels. As CO
2
dampers to increase ventilation and improve indoor air quality. These sensors also monitor temperature using a
10K thermistor.
A CO sensor can be wall-mounted or mounted in a return air duct. (Duct installation requires an Aspirator Box
2
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
#33ZCSPTCO2
Wire the sensor to the controller. See appropriate diagram below.
1
Verify that the RH/CO2 jumper is set to 0-5 Vdc on the VAV Zone II.
2
Verify the J7 jumper on the sensor is set to 0-5 Vdc.
3
Wiring diagram for #33ZCSPTCO2:
#33ZCT55CO2
Wire the sensor to the controller. See appropriate diagram below.
1
Install a field supplied 250 Ohm 1/4 watt 2% tolerance resistor across the controller's RH/CO2 and Gnd
2
terminals.
VAV Zone II Controllers
Installation and Start-up Guide
levels increase, the VAV Zone II adjusts the outside air
2
input terminals.
2
sensor on the same zone controller.
2
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