Carrier RTU Open v3 - Wiring a Humidistat

Installing the RTU Open
RTU Open v3 CARRIER CORPORATION ©2019
Installation and Start-up Guide All rights reserved
34
Wiring a Humidistat
Locally Purchased
A humdistat may be used for zone humidity control (dehumidification) when applied to a Carrier rooftop unit
equipped with the Humidi-MiZer™ option. On units not equipped for dehumidification, the humidistat will indicate
a high humidity condition only.
NOTE
The humidistat is NOT an option for LC WeatherExpert™ units with gas heat. You must use the RH sensor
for humidity control.
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 a humidistat to the controller
1 Strip the outer jacket from the cable for at least 4 inches (10.2 cm). Strip .25 inch (.6 cm) of insulation from
each wire
2 Wire the humidistat to the controller. See diagram below.
3 Apply power and verify sensor readings.
NOTE
Humidistat may be return duct or space mounted.