Wiring specifications, To wire an oat sensor to the controller, Wiring a co2 sensor – Carrier RTU OPEN 11-808-427-01 User Manual
Page 30: E 24)
Installation
24
RTU Open
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 an OAT sensor to the controller
1
Connect the wiring harness (Part#OPN-RTUHRN). For details, see To wire inputs and outputs (page 14).
2
Wire the sensor to the wiring harness. See diagram below.
3
Connect to J2 wires 3 and 4.
4
Verify your sensor readings.
Wiring a CO2 sensor
Part #33ZCSPTCO2LCD-01 (Display model)
Part #33ZCSPTCO2-01 (No display)
Part #33ZCT55CO2 (No display)
Part #33ZCT56CO2 (No display)
A CO
2
sensor monitors carbon dioxide levels. As CO
2
levels increase, the RTU Open adjusts the outside air
dampers to increase ventilation and improve indoor air quality. 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. The CO
2
sensor’s power requirements
exceed what is available at J4 - 1 and 4. Provide a dedicated 24Vac transformer or DC power supply