C from furnace
or air-handler
Fig. 31. Wired to fresh air damper powered by furnace
transformer
R from 24 volt
transformer
Fig. 32. Wired to humidifier, ventilator, or damper
powered by external transformer
Damper
M37824
Humidifier,
dehumidifier,
or ventilator
C (common) from
24 volt transformer
M37825
* Label for this terminal
varies by equipment
Fig. 33. Wired to low speed fan terminal on HVAC for
dehumidification
15
Dehumidifier*
Furnace or
air-handler
M37826
33-00462—05