Installation
22 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 the SAT sensor to the controller
1 Connect the wiring harness (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 1 and 2.
4 Verify your sensor readings.
Wiring a Duct Air Temperature sensor
Part #33ZCSENDAT
The RTU Open requires a temperature sensor installed in the supply air stream. The Duct Temperature (DAT)
sensor is generally used when the rooftop unit is NOT equipped with electric heating.
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)
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