Installing the VVT Zone II
VVT Zone II Controller
CARRIER CORPORATION ©2019
Installation and Start-up Guide
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21
To wire a Duct Air Sensor to the controller
1
Wire the sensor to the controller. 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).
4
Verify that the
Enable SAT
jumper is on.
5
Verify that the
Enable SAT and REMOTE
jumper is in the left position.
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, the VVT Zone II adjusts the outside air
dampers to increase ventilation and improve indoor air quality. 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.
#33ZCSPTCO2
1
Wire the sensor to the controller. See appropriate diagram below.
2
Verify that the
RH/CO2
jumper is set to
0-5 Vdc
on the VVT Zone II.
3
Verify the
J7
jumper on the sensor is set to
0-5 Vdc
.
Summary of Contents for VVT Zone
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