Ventilation - Honeywell Home T10 Pro RedLINK Manual

closed, they will open when the thermostat calls for
dehumidification. See "Whole House humidifier,
dehumidifier, or ventilator wiring" Fig. 26 to Fig. 29.
If humidification and dehumidification are both setup to
operate in the system mode (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.
Dehumidification using A/C with Low Speed Fan, A/C with
High Speed Fan, has the following methods of
dehumidification control (ISU 9080):
Dehumidification overcooling limit (ISU 9070):
This option uses the cooling system to lower the
temperature up to 5° F below the current cool setpoint
until the desired humidity is reached. The Dehum Over
Cooling Limit range is from 1° to 5° F.
NOTE: The thermostat will not lower the fan speed when
the second stage of cooling is on.
Set up Dehumidification With Cooling System
Some screens shown in this section may not appear on the
thermostat, depending on how you set up
dehumidification.
1. Select the Dehumidification Equipment in ISU 9000.
See page 24.
2. Select whether the U terminals are Normally Open or
Normally Closed. See page 25.
• 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.
3. Set the Overcooling Limit. See page 25. Options:
• 0 °F to 3 °F (A/C with Low Speed Fan)
• 1 °F to 3 °F (A/C with High Speed Fan)
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.)
1. Select the Dehumidification Equipment in ISU 9000.
See page 24.
2. Select the system mode(s) to allow dehumidification
ISU 9120. See page 25.
NOTE: Heat includes Heat, Emergency Heat and Auto. If
the system is in Auto mode, the thermostat 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.
3. Set Dehumidifier Fan Control settings ISU 9130. See
page 25.
T10 PRO SMART THERMOSTAT WITH REDLINK
• Tstat Controls Fan Thermostat turns on the
dehumidifier and the fan when dehumidification is
needed.
• Equip Controls Fan Thermostat turns on the
dehumidifier when dehumidification is needed. The fan
is controlled by the equipment.
4. Set the desired lockout option. See ISU 9140 on
page 25.
Control Dehumidification Level
1. Touch MENU and select Dehumidification.
2. Touch ^ or v to select dehumidity level.
3. Touch options if you want to enable/disable the
dehumidifier.
When disabled, the display will show off when view-
ing the dehumidifier setting screen.
4. Touch Done to save your settings.
NOTE: If your air conditioner is used to control humidity,
the temperature may drop up to 3° F below your
temperature setting until humidity reaches the
desired level.
NOTE: If humidification and dehumidification are setup
to operate in the same system mode (Off) the
thermostat will automatically enforce a 15%
deadband between the humidification and dehu-
midification settings. The thermostat will auto-
matically switch between humidification and
dehumidification to maintain the desired humid-
ity level.
Dehumidification using the Cooling
System
Dehumidification using A/C with Low Speed Fan, A/C with
High Speed Fan, has the following methods of
dehumidification control (ISU 9080):
Cooling Droop (ISU 9080): This option uses the cooling
system to lower the temperature up to 3° F below the
current cool setpoint until the desired humidity is reached.
The Dehum Over Cooling Limit range is from 0° to 3° F for
dehum with low speed fan or 1° to 3° F for dehum with
high speed fan.

Ventilation

The thermostat can be set for the following ventilation
types: (ISU 10000)
• ERV/HRV
• Passive (Fan Only)
• Fresh Air Damper
Ventilation Control Methods (ISU 10050)
Ventilation can be setup to meet either ASHRAE or
Percent On Time settings. To meet these settings, the
thermostat will ventilate during calls for heat, cool, and
fan. If the required ventilation has not been achieved for
ASHRAE or Percent On Time, the thermostat will force the
ventilation equipment on.
ASHRAE
The thermostat operates ventilation equipment to meet
the ASHRAE 62.2 ventilation standard based on CFM,
number of bedrooms, and square footage of the house.
ASHRAE 62.2 can only be met if the ventilation equipment
is running. If the ventilation equipment is off for any
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