Google Nest Learning Thermostat 4th Gen Installation And Configuration Manual page 45

Humidifier settings
There are two different configurations for humidifiers, standalone and Heat Integrated. You will also need
to choose whether to activate the system fan when running the humidifier. When enabled, the user can
choose the minimum relative humidity the thermostat will maintain. They can also enable the Smart
Humidification feature, which uses outdoor weather to automatically reduce the humidity setpoint to
prevent condensation forming on indoors. The last available setting is Quiet Time, which will prevent the
humidifier from running during the specified hours. The user can choose a relative humidity to maintain
between 10% RH and 60% RH.
Dehumidifier settings
Dehumidifiers can be configured as a Standalone or A/C integrated system. You will need to choose whether
to run the fan when running the dehumidifier and whether the equipment is activated when the relay is open
or closed.
A/C integrated humidifiers will use the Cool to Dry feature to maintain humidity. A standalone humidifier will
have the option to maintain a specific relative humidity percentage. The user can choose a target percentage
between 30% RH and 80% RH.
During Pro Setup, you can adjust Cool to Dry settings on the Advanced Settings page at the end of the setup
process. You can adjust the Overcooling limit from 1-5°F, the Humidity Threshold at which Cool to Dry will turn on
from 55% RH to 80% RH. You can also adjust the minimum indoor temperature for when the thermostat will
enable Cool to Dry from 68-85°F. For more information on Cool to Dry, see page 18 in the Key Features section.
Combined humidifier/dehumidifier settings
When both a humidifier and dehumidifier are connected to the thermostat, you will be able to set a range of
relative humidity the thermostat should maintain. The humidification target must be 15% RH below the
dehumidification target.
Installation Overview - Complex Systems
44