Honeywell Home THX9321 Prestige 2.0 Manual page 111

5. Select the system mode(s) to allow dehumidification.
See Fig. 250.
NOTE: Heat includes Heat, Emergency Heat and
Auto. If the system is in Auto mode, the ther-
mostat will allow dehumidification if the last
call was for heat.
Cool includes Cool and Auto. If the system is
in Auto mode, the thermostat will allow
dehumidification if the last call was for cool.
Fig. 250.
6. Set Dehumidifier Fan Control settings. See Fig. 251.
• Thermostat Controls Fan
Thermostat turns on the dehumidifier and the fan
when dehumidification is needed.
• Equipment Controls Fan
Thermostat turns on the dehumidifier when
dehumidification is needed. The fan is controlled
by the equipment.
Fig. 251.
7. Set the desired lockout option. See Fig. 252.
Fig. 252.
®
THX9321 PRESTIGE 2.0 AND THX9421 PRESTIGE
NOTE: ISU 10140 gives the option to lockout venti-
lation on calls for dehumidification. This
helps maintain the desired humidity level.
Dehumidification Away Mode
Dehumidification Away Mode for a commercial application
is identical to Dehumidification Away Mode for a
residential application. See "Dehumidification Away Mode"
on page 106 and "Set up Dehumidification Away Mode"
beginning on page 106.
Control Dehumidification Level
1. Press MENU, then scroll to select Dehumidification.
2. Press Auto to use the dehumidifier or cooling system
to maintain your desired humidity level.
3. Press Off to turn off dehumidification.
4. Move the slider bar to the humidity level you prefer,
then press DONE. The dehumidification setting
range is 40–80% in 5% increments.
5. If your air conditioner is used to control humidity, the
thermostat may use the following methods to main-
tain your desired humidity:
• Cool from 1° to 5° F lower than your temperature
setting.
• Run cooling for the minimum "on" time to reduce
humidity.
• Run cooling and heating at the same time to
reduce humidity without lowering the
temperature.
6. Press MORE SETTINGS to review or change settings
for the dehumidifier filter timer.
NOTE: If humidification and dehumidification are setup
to operate in the same system mode (Heat, Cool,
Off) and you are sensing humidity from one loca-
tion, 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 differ-
ent locations using a remote wireless indoor sen-
sor (for example, main level and crawl space), the
thermostat will allow humidification and dehu-
midification to operate at the same time, and there
is no deadband between humidification and dehu-
midification settings.
111
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IAQ WITH EIM
68-0311—08