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Wiring inputs and outputs
TruVu™ VVTZC
-E2
©2022 Carrier.
Installation and Start-up Guide
All rights reserved.
34
To wire and mount the DAT sensor
1
Wire the sensor to the controller's
IN-03
and
Gnd
terminal. See diagram below.
NOTE
Sensor wiring does not have polarity. The wires can be connected to either terminal.
2
Using electrical tape, insulate any exposed wire to prevent shorting.
3
Connect shield to earth ground (if using shielded wire to extend cable length).
To wire the CO2 sensor to the controller
Part #33ZCSPTCO2LCD-01 (Display model)
Part #33ZCSPTCO2-01 (No display)
Part #33ZCT55CO2 (No display)
A CO
2
sensor monitors carbon dioxide levels. As CO
2
levels increase in a linked system, IAQ is provided to the air
source. These sensors also monitor temperature using a 10K thermistor.
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. This is converted to 1-5 Vdc by a 250 Ohm,
1/4 watt, 2% tolerance resistor connected across the zone controller's CO
2
input terminals.
NOTE
Do not use a relative humidity sensor and CO
2
sensor on the same zone controller.