Dehumidification - Residential - Honeywell Home THX9321 Prestige 2.0 Manual

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, the thermostat will allow humidification and
dehumidification to operate at the same time, and
there is no deadband between humidification and
dehumidification settings.
Press MENU
Scroll to select HUMIDIFICATION
Set humidity to desired level
Window Protection
limits the amount of
humidity to prevent
frost or condensation
on windows
Fig. 218.
Press More Settings to set:
• Window Protection Setting
• Review humidifier pad or
clean tank / water filter
timer
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THX9321 PRESTIGE 2.0 AND THX9421 PRESTIGE

Dehumidification - Residential

The thermostat reads the indoor humidity level and allows
the user to set a dehumidification setting. The thermostat
controls the humidity level using the cooling system or a
whole house dehumidifier.
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 (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.
Dehumidification Using the Cooling
System
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 temperature up to 3° F
below the current cool setpoint until the desired humidity
level is reached.
If set for A/C with Low Speed Fan, configure U1, U2, or U3
as normally open or normally closed (ISU 9050) and wire to
the Low Speed Fan terminal on the equipment. For
example, if the U1, U2, or U3 terminal is normally closed, it
will open when the thermostat calls for
dehumidification.See "Wiring IAQ Equipment or a
Heat/Cool Stage to the U Terminals" beginning on
page 148.
NOTE: The thermostat will not lower the fan speed when
the second stage of cooling is on.
Dehumidification Fan Speed Priority
If the house has circulation issues to certain parts of the
house when running in low speed, this feature will allow the
thermostat to use the high speed fan more often so that
the conditioned air has better circulation within the home.
103
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IAQ WITH EIM
Fig. 219.
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