Installation
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 SAT sensor to the controller
1
Wire the sensor to the controller. See diagram below.
2
Verify that the
Enable SAT
jumper is on.
3
Verify that the
Enable SAT and REMOTE
jumper is in the left position.
Wiring a CO2 sensor
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 VAV Zone Controller 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.
VAV Zone Controllers
19
