Set Up Dehumidification With Whole House Dehumidifier - Honeywell Prestige 2.0 THX9421 Manual

5. Select whether the U1, U2, or U3 terminals are Nor-
mally Open or Normally Closed. See Fig. 224.
• Normally Open – contacts are normally open and
will close during a call for dehumidification
• Normally Closed – contacts are normally closed
and will open during a call for dehumidification.
Fig. 224.
6. Set the Overcooling Limit. See Fig. 225. Options:
• 0 °F to 3 °F (A/C with Low Speed Fan)
• 1 °F to 3 °F (A/C with High Speed Fan)
Fig. 225.
NOTE: ISU 10140 gives the option to lockout venti-
lation on calls for dehumidification. This
helps maintain the desired humidity level.
Dehumidification using a Whole House
Dehumidifier
The Whole House Dehumidifier option requires a
dedicated unit for dehumidification. The thermostat can
be set to control dehumidification in all modes (Heat, Off,
Cool [ISU 9120]).
Set up Dehumidification With Whole
House Dehumidifier
Some screens shown in this section may not appear on the
thermostat, depending on how you set up
dehumidification.
®
THX9321 PRESTIGE 2.0 AND THX9421 PRESTIGE
1. Select the Dehumidification Equipment in ISU 9000.
See Fig. 226.
2. If optional remote wireless indoor sensors are
installed, you can choose which sensor you want to
use for dehumidification control. For example, you
can use one sensor for humidification control, and
another for dehumidification. See "Wireless Indoor
Sensor" beginning on page 132 for more informa-
tion.
3. If you are sensing humidity from two separate loca-
tions (one for humidification and another for dehu-
midification), you can select which humidity reading
to display on the home screen. See "Wireless Indoor
Sensor" beginning on page 132 for more informa-
tion.
107
®
IAQ WITH EIM
Fig. 226.
Fig. 227.
Fig. 228.
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