Ventilation - Honeywell VisionPRO 8000 Product Data

®
VISIONPRO 8000 WITH WI-FI
2. Select Auto.
Dehumidification
Off
3. Touch
or to select humidity level.
 
4. Touch Done to save your settings. Touch Cancel to
ignore changes.
If your air conditioner is used to control humidity, the
thermostat may use the following methods to maintain
humidity:
• Cool from 1° to 5° F lower than your temperature setting.
• Run cooling for the minimum "on" time to reduce humidity.
• Run cooling and heating at the same time to reduce
humidity without lowering the temperature.
NOTE: If humidification and dehumidification are setup
to operate in the same system mode (Heat, Cool,
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.

Ventilation

The thermostat can be set for the following ventilation types:
(ISU 1000)
• ERV/HRV
• Passive (Fan Only)
• Fresh Air Damper
Ventilation Control Methods (ISU 1005)
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 1012 to select a Ventilation Priority.
33-00096—01
®
Auto
MCR34131
Fig. 156.
• Percent On Time
The thermostat operates ventilation equipment based on a
percentage entered in the installer setup (ISU 1012). 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 1006)
• 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 1012)
• 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
1013)
— Lockout Ventilation on Humidification or Dehumidifica-
tion Calls (ISU 1014)
— Lockout Ventilation during "Sleep" (Residential) or
"Unoccupied" (Commercial) program periods. Note:
This option is set by the user on the Ventilation screen
in the Menu.
• 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 the outdoor lockouts and run ventilation. When
using this option, it is recommended to increase the rate
(CFM) of the ventilation equipment to meet the ASHRAE
62.2 ventilation standard in a shorter run time.
NOTES: ISU 1014 Lockout Ventilation on Humidification or
Dehumidification Calls is not an option when you
select ASHRAE is Priority.
The ability to lockout ventilation during the "Sleep" or
"Unoccupied" program periods is not an option when
you select ASHRAE is Priority.
Ventilation — Outdoor Condition Lockouts
(ISU 1013)
Ventilation will not operate when outdoor conditions exceed the
lockout settings unless you manually call for ventilation or
Ventilation Priority (ISU 1012) is set to ASHRAE is Priority
and ventilation is needed to meet ASHRAE. Lockouts can
prevent ventilation during extreme weather conditions to keep
humid, hot, and cold air out of the home.
NOTE: This feature requires a wired sensor for outdoor
temperature limits, or Internet connection for
temperature and humidity lockouts.
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