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®
THX9321 PRESTIGE
2.0 AND THX9421 PRESTIGE
Fig. 207.
7. Select the Backup Heat Type. See Fig. 208.
Fig. 208.
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.
68-0311—07
®
IAQ WITH EIM
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.
102
Fig. 209.
Fig. 210.
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