Ventilation - Honeywell Home T10 Product Data

Set up Dehumidification Away Mode
1. Select Allowed at ISU 9180.
2. Set Fan Control settings at ISU 9190.
• On: Fan is always on.
• Automatic: Fan runs only when cooling system is on.
• Circulate: Fan runs randomly, about 35% of the
Time.
3. Set temperature and dehumidification settings at ISU
9200
• 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.
• 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. Touch MENU and select Dehumidification.
2. Touch s or t to select dehumidity level.
3. Touch options if you want to enable/disable the
dehumidifier.
When disabled, the display will show off when viewing
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 tem-
perature setting until humidity reaches the desired
level.
NOTE: If humidification and dehumidification are setup to
operate in the same system mode (Off) the thermo-
stat will automatically enforce a 15% deadband
between the humidification and dehumidification set-
tings. The thermostat will automatically switch
between humidification and dehumidification to
maintain the desired humidity level.

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 reason
(outdoor ventilation lockouts, set up to turn Off during Sleep
period, turned off by user, etc.), ASHRAE 62.2 is not met
during those times. See ISU 10125 to select a Ventilation
Priority.
Percent On Time
The thermostat operates ventilation equipment based on a
percentage entered in the installer setup (ISU 10120). For
example if Percent On Time is set to 50%, the ventilation
equipment will run at random times during a 1 hour period
until it reaches a 50% run time (approximately 30 minutes).
Default setting is 30%. Range is 10% to 100% in 10%
increments.
Ventilation Fan Control (ISU 10060)
• Tstat Controls Fan
— The thermostat turns on the ventilator and the fan
when ventilation is needed.
• Equip Controls Fan
— The thermostat turns on the ventilator when ventilation
is needed. The fan is controlled by the equipment.
Ventilation Priority (ISU 10125) Lockouts
are Priority
The thermostat places a priority on lockouts versus the
ASHRAE 62.2 ventilation standard. The thermostat will not
run ventilation during the following lockout conditions (if
configured) unless you manually call for ventilation:
— Lockout Ventilation during Outdoor Conditions (ISU
10130)
— Lockout Ventilation during "Sleep" program periods.
Note: This option is set by the user on the Ventilation
screen. From Home press Menu > Ventilation >
Options > Disable During Sleep.
— Turn on ventilation due to a custom Dry Contact Alert
setting. This is if someone set ISU 6005 for a custom
Dry Contact Alert and set ISU 10065 to turn on the
ventilator.
— Lockout ventilation due to a custom Dry Contact Alert
setting. This is if someone set ISU 6005 for a custom Dry
Contact Alert and set ISU 10145 to lock out the ventilator.
Opposite actions cannot be selected for the same custom dry
contact (Ex. user cannot select both to Turn Ventilation On
and Lockout Ventilation for the Custom Dry Contact 1).
If opposite actions are triggered at the same time due to
different custom dry contacts (example, Dry Contact Alert 1
set to turn on ventilator and custom dry contact 2 set to lock
out ventilator), Lockout Ventilation has priority over Turn
Ventilation On.
ASHRAE IS PRIORITY
ASHRAE requires additional ventilation following a long off
cycle. The thermostat meets the ASHRAE 62.2 ventilation
standard by running additional ventilation when outdoor
conditions are favorable. If ASHRAE cannot be met when
outdoor conditions are favorable, the thermostat will override
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