Wiring An Outdoor Air Temperature Sensor - Carrier RTU Open v3 Installation And Startup Manual

5
Drill .25" diameter hole. Pass sensor leads through bushing and insert assembly into hole. Secure leads to
ductwork with aluminum tape.
NOTE Sensor termination requires installation of RTU Open wiring harness assembly (Part #OPN-RTUHRN).

Wiring an outdoor air temperature sensor

Part #33ZCSENOAT
Outdoor Air Temperature (OAT) is required to use all of the RTU Open's features. OAT may be provided by a local
sensor (shown below) or a linked sensor in another controller. See Single Point Linkage (page 91).
Wiring specifications
Cable from sensor to controller:
Maximum length:
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 16).
2
Wire the sensor to the wiring harness. See diagram below.
3
Connect to J2 wires 3 and 4.
RTU Open v3
Installation and Start-up Guide
If <100 ft (30.5 meters)
If >100 ft (30.5 meters)
500 feet (152 meters)
29
Installing the RTU Open
22 AWG, unshielded
22 AWG, shielded
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