Aprilaire 8620 Indoor Air Quality System SettingS Tables, Air Cleaning System Settings Table

Setup & Testing

Indoor Air Quality System SettingS Tables

The following tables contain the Indoor Air Quality system settings and their details.. Default settings are shown in bold.. Some settings are only present dependent upon the value of other settings..

The use of the included outdoor temperature sensor (recommended) enables additional Indoor Air Quality functionality.. If the outdoor temperature sensor was not enabled in the HVAC system settings, HVAC system setting 11, outdoor sensor, will be presented prior to entering the Indoor Air Quality system settings.

Please refer to the Model 8620 Owner’s Manual for further information about thermostat features.

Air Cleaning System Settings Table

		Factory default setting (bold)
System setting	Description	and setting range
Air Cleaner Installed	Selects if an air cleaner is installed. (If set to no, no other	No
	air cleaning settings will be available..)	Yes
Change Air Filter Reminder	The period for displaying the “Change Air Filter” message.	Off
		1 to 12 months or “Off” to disable

Humidifier System Settings Table

Note: A humidifier can only be installed if ventilation is not installed and dehumidifier control is not set to whole home..

		Factory default setting (bold)
System setting	Description	and setting range
Humidifier Installed	Selects if a humidifier is installed. (If set to no, no other	No
	humidifier settings will be available..)	Yes
Humidifier Mode	Selects auto or manual mode.. Auto mode controls humidity	Auto
	based on the humidity setting and outdoor temperature..	Manual
	Manual mode controls humidity based on the %RH setpoint.
	(Auto mode is only available if outdoor sensor is set to yes..)
Humidity Setpoint	Select the minimum difference between the humidifier	10 Percent RH
Deadband	and dehumidifier setpoints.. (Only available if humidifier	10 to 20 Percent RH
	mode is set to manual and dehumidifier control is set to air
	conditioner.. Available in both set-ups..)
Humidifier Operation	Selects when humidification is allowed to occur relative to	Heat Only
	heating and fan operation..	Heat or Fan
		Forces Fan
Change Water Panel	Selects the when the “Change Water Panel” message is	Off
Reminder	displayed..	1 Per Season
		2 Per Season
		300 Hours
		600 Hours
Reminder Month (Change	Change Water Panel Reminder set to 1 per Season:	October
Water Panel Reminder set	Determines the month the “Change Water Panel” message	November
to 1 per Season)	is displayed..	December
		January
First Reminder Month	Change Water Panel Reminder set to 2 per Season:	February
(Change Water Panel	Determines the first month the “Change Water Panel”	March
Reminder set to 2 per	message is displayed..	April
Season)		May
		June
		July
		August
		September
Second Reminder Start	Determines the second month the “Change Water Panel”	October
Month	message is displayed.. (Only available when Change Water	November
	Panel Reminder set to 2 per Season..)	December
		January
		February
		March
		April
		May
		June
		July
		August
		September

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Setup & Testing

Dehumidifier System Settings Table

Note: Dehumidifier control can only be set to whole home if ventilation and humidification are not installed..

		Factory default setting (bold)
System setting	Description	and setting range
Dehumidifier Control	Selects method of dehumidification.(If set to none, no	None (no dehumidification installed)
	other dehumidifier settings will be available..)	Whole Home
		Air Conditioner
Humidity Setpoint Deadband	Select the minimum difference between the humidifier	10 Percent RH
	and dehumidifier setpoints.. (Only available if	10 to 20 Percent RH
	humidifier mode is set to manual and dehumidifier
	control is set to air conditioner.. Available in both
	set-ups..)
Lockout Dehumidifier During	Selects if dehumidification is disabled during a cooling	No
Cooling	call.. (Only available if dehumidifier control is set to	Yes
	whole home..)
Dehumidifier Forces Fan	Select if dehumidification can turn on the fan.. (Only	No
	available if dehumidifier control is set to whole home..)	Yes
Dehumidifier Service	The period for displaying the “Dehum Service	Off
Reminder	Reminder” message. (Only available if dehumidifier	1 to 12 months or “Off” to disable
	control is set to whole home..)
Dehumidifier Overcooling	Selects the amount of overcooling that can occur	3°F (1.5°C)
Limit	for dehumidification.. (Only available if dehumidifier	1°F to 3°F (0.5°C to 1.5°C)
	control is set to air conditioner..)
Dehumidify in Vacation	Selects if dehumidification with the air conditioner is	No
Mode	done in Vacation Mode. (Only available if dehumidifier	Yes
	control is set to air conditioner..
Vacation Dehumidifier Low	Sets the lowest temperature the air conditioner will cool	75°F (24°C)
Temp Limit	to meet RH setpoint in Vacation Mode. (Only available if	70°F to 85°F (21°C to 29°C)
	dehumidifier control is set to air conditioner..)

Ventilation System Settings Table

Note: Ventilation can only be installed if humidification is not installed and dehumidifier control is not set to whole home..

		Factory default setting (bold)
System setting	Description	and setting range
Fresh Air Vent Installed	Selects if ventilation is installed..	No
	(If set to no, no other ventilation settings will be available.)	Yes
Fresh Air Forces Fan	Selects if ventilation forces the fan on..	No
		Yes
Fresh Air Setup	Selects if ventilation is configured through the ASHRAE setup	Timed
	or Timed. If ASHRAE setup is selected, the hourly ventilation	ASHRAE
	time will be calculated using the ASHRAE recommendations..
	If Timed set-up is selected, the hourly ventilation time will be
	determined based on the Fresh Air Time value.
Fresh Air Time	Selects how many minutes per hour that ventilation will be	30 MIN/HR
	active.. (Only available if fresh air setup is set to timed..)	0 to 60 MIN/HR
High Limit Outdoor	Selects if ventilation is disabled if the outdoor temperature	No
Temp	exceeds the outdoor high limit. (Only available if fresh air setup	Yes
	is set to timed and an outdoor temperature sensor is installed..)
Outdoor High Limit	Sets the high temperature limit for ventilation.. (Only available if	100°F (38°C)
	high limit outdoor temp set to yes..)	90°F to 100°F (32°C to 38°C)
Low Limit Outdoor Temp	Selects if ventilation is disabled if the outdoor temperature	No
	exceeds the outdoor low limit. (Only available if fresh air setup	Yes
	is set to timed and an outdoor temperature sensor is installed..)
Outdoor Low Limit	Sets the low temperature limit for ventilation.. (Only available if	10°F (-11°C)
	low limit outdoor temp set to yes..)	-10°F to 30°F (-23°C to -1°C)
High Limit Indoor RH	Selects if ventilation is disabled if the indoor RH exceeds the	No
	indoor RH limit.. (Only available if fresh air setup is set to timed..)	Yes
Indoor RH Limit	Sets the high indoor RH limit for ventilation.. (Only available if	60%
	high limit indoor RH is set to yes..)	50% to 70%

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