To Wire A Humidistat To The Controller; Wiring An Enthalpy Switch; Wiring Specifications - Carrier RTU OPEN 11-808-427-01 Installation And Startup Manual

Installation

To wire a humidistat to the controller

Strip the outer jacket from the cable for at least 4 inches (10.2 cm). Strip .25 inch (.6 cm) of insulation
1
from each wire
Wire the humidistat to the controller. See diagram below.
2
Apply power and verify sensor readings.
3
NOTE Humidistat may be return duct or space mounted.

Wiring an enthalpy switch

Outdoor Air - Part #33CSENTHSW
Return air - Part #33CSENTSEN
The 33CSENTHSW is an outdoor air enthalpy switch/receiver. This control determines the suitability of the
outdoor air as a cooling source, based on the heat content of the air. Differential enthalpy control requires
installing a 33CSENTSEN enthalpy sensor in the rooftop unit's return air duct.

Wiring specifications

Cable from sensor to controller:
Maximum length:
28
If <100 ft (30.5 meters)
If >100 ft (30.5 meters)
500 feet (152 meters)
22 AWG, unshielded
22 AWG, shielded
RTU Open