Wiring A Humidistat - Carrier RTU Open v3 Installation And Startup Manual

Installing the RTU Open

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:
Maximum length:
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.
RTU Open v3
Installation and Start-up Guide
If <100 ft (30.5 meters)
If >100 ft (30.5 meters)
500 feet (152 meters)
34
22 AWG, unshielded
22 AWG, shielded
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