RTU Open 27
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 RH sensor 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 sensor to the controller. See diagram below.
3 Apply power and verify sensor readings.
NOTE Sensor may be terminated at Input 1 or 2.
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.
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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