Indoor Air Quality (Iaq) Control; Humidification; Set Up Humidification - Honeywell TH8321 Product Data

Fig. 113.
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 806). 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) 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.
Window Protection
Window Protection limits the amount of humidity to
prevent frost or condensation on windows. Window
Protection (ISU 805) requires an outdoor sensor.
The thermostat prevents frost or condensation on windows
by not allowing the humidifier to run above a certain level.
To prevent frost or condensation, the thermostat may turn
off the humidifier before the humidity setting is reached.
To adjust the Window Protection setting, press MENU,
scroll down and select Window Protection. 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
VISIONPRO® 8000 SMART THERMOSTAT
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.
If Window Protection is turned Off, the thermostat controls
the humidity level to the user's desired humidity setting.
Frost or condensation may appear on windows.

Set up Humidification

1. Select the Humidifier Type at ISU 800. See Fig. 115.
NOTE: Based on the humidifier type you select, the
thermostat defaults to the most commonly
used settings for that humidifier type.
For example, a Bypass or Fan Powered
humidifier will default ISU 807 to "Hum
when Heat is On."
A Steam humidifier will default ISU 807 to
"Tstat Controls Fan."
57
Fig. 114.
Fig. 115.
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