Indoor Air Quality (Iaq) Control; Humidification - Honeywell Home THX9321 Prestige 2.0 Manual

®
THX9321 PRESTIGE 2.0 AND THX9421 PRESTIGE
4. Select the Geothermal Radiant Heat Options. For
example: If this zone is Geothermal Radiant Heat only
– select None. See Fig. 205.
Fig. 205.
5. Select the Reversing Valve. See Fig. 206.
Fig. 206.
6. Select the number of Compressor and Backup Heat
Stages. See Fig. 207.
Fig. 207.
7. Select the Backup Heat Type. See Fig. 208.
Fig. 208.
68-0311—08
®
IAQ WITH EIM
INDOOR AIR QUALITY (IAQ)
CONTROL

Humidification

The thermostat reads the indoor humidity level and allows
the user to set a humidification setting with or without
window protection.
The thermostat can be set up to control a humidifier in any
system mode in the Installer Setup (ISU 8060). A discharge
air sensor is required to humidify in the cool mode.
If humidification and dehumidification are setup to operate
in the same system mode (Heat, Cool, Off) and you are
sensing humidity from one location, the thermostat will
automatically enforce a 15% deadband between the
humidification and dehumidification settings. The
thermostat will automatically switch between
humidification and dehumidification to maintain the
desired humidity level.
If humidification and dehumidification are setup to operate
in the same system mode (Heat, Cool, Off) and you are
sensing humidity from two different locations using a
remote wireless indoor sensor, the thermostat will allow
humidification and dehumidification to operate at the
same time, and there is no deadband between
humidification and dehumidification settings.
Window Protection
Window Protection limits the amount of humidity to
prevent frost or condensation on windows. Window
Protection (ISU 8050) requires an outdoor sensor.
The maximum humidity level that is allowed ("Window
Limit") is displayed on the Humidification Settings screen.
The thermostat prevents frost or condensation on windows
by not allowing the humidifier to run above the "Window
Limit." The thermostat may turn off the humidifier before
the desired humidity setting is reached.The Window Limit
is based on the current outdoor temperature and the user's
window protection setting.
To adjust the Window Protection setting, press More
Settings from the Humidification screen. Window
Protection is set on a scale from 1-10. A setting of "1"
represents poorly insulated windows and a setting of "10"
represents well insulated windows. A lower number
automatically reduces the humidity to help prevent frost or
condensation on your windows. Use a higher number if
indoor air seems too dry. To prevent frost/condensation on
your windows during cold outdoor temperatures, poorly
insulated windows require a lower Window Protection
setting, which will limit how much your humidifier can run.
After you set the Window Protection setting, check for
frost/condensation on your windows in the morning. If
frost/condensation is present, adjust the Window
Protection setting to the next lowest number and check for
frost/condensation on your windows the next morning.
Continue to adjust the Window Protection setting to a lower
number until frost/condensation is no longer present.
100