Set Up Dehumidification Away Mode; Control Dehumidification Level - Honeywell Prestige 2.0 THX9421 Manual

Fig. 234.

Set up Dehumidification Away Mode

1. Select Allowed at ISU 9180. See Fig. 235.
Fig. 235.
2. Set Fan Control settings. See Fig. 236.
• On: Fan is always on.
• Automatic: Fan runs only when cooling system is
on.
• Circulate: Fan runs randomly, about 35% of the
time.
Fig. 236.
3. Set temperature and dehumidification settings. See
Fig. 239.
• Low Limit Temperature Setting
If the cooling system is used to control humidity
while Dehumidification Away Mode is active, the
thermostat allows the cooling system to lower the
indoor air to the Low Limit Temperature Setting to
reach the Dehumidification Setting at ISU 9200.
®
THX9321 PRESTIGE 2.0 AND THX9421 PRESTIGE
• Temperature Setting
The temperature maintained while
Dehumidification Away Mode is active and the
desired humidity level is satisfied.
• Dehumidification Setting
The desired humidity level while
Dehumidification Away Mode is active.

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.
NOTE: When set for A/C with Low Speed Fan or
A/C with High Speed Fan, an overcooling
limit can be set from 0 °F to 3 °F (ISU 9070).
The thermostat uses the cooling system to
reduce humidity by lowering the tempera-
ture up to 3° F below the current cool set-
point until the desired humidity level is
reached.
5. 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 humid-
ity level.
If humidification and dehumidification are setup
to operate in the same system mode (Heat, Cool,
Off) and you are sensing humidity from two dif-
ferent locations using a remote wireless indoor
sensor (for example, main level and crawl space),
the thermostat will allow humidification and
dehumidification to operate at the same time, and
there is no deadband between humidification and
dehumidification settings.
109
®
IAQ WITH EIM
Fig. 237.
68-0311—07