Honeywell pro Series Professional Install Manual page 5

Whole house humidifier, dehumidifier, or ventilator
Using U Slider Tab
Wired to humidifier,
dehumidifier or ventilator
with built-in transformer.
11
Wired to humidifier, ventilator,
or damper powered by external
transformer
13
R from 24 volt
transformer
Humidifier,
dehumidifier,
or ventilator
Humidifier,
dehumidifier,
or ventilator
C (common) from
24 volt transformer
Wired to fresh air damper
powered by furnace
transformer.
12
C from furnace
or air-handler
Wired to low speed fan
terminal on HVAC for
dehumidification
14
* Label for this terminal
varies by equipment
5
Damper
Dehumidifier*
Furnace or
air-handler