Humidifier System Settings Table; Dehumidifier System Settings Table - Aprilaire 8820 Safety & Installation Instructions

SETUP & TESTING

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 or AC w/IAQ Output .
System setting Description
Humidifier Installed Selects if a humidifier is installed . Yes/On HVAC is used
for applications where the humidifier is installed on the
HVAC duct . Yes/Standalone is used for application where
the humidifier is independent of the HVAC system . (If set to
no, no other humidifier settings will be available .)
Humidifier Mode Selects auto or manual mode . Auto mode controls humidity
based on the humidity setting and outdoor temperature .
Manual mode controls humidity based on the %RH setpoint .
(Auto mode is only available if outdoor sensor is set to
Installed or Automation .)
Humidity Setpoint Selects the minimum difference between the humidifier
Deadband and dehumidifier setpoints . (Only available if a humidifier is
installed and dehumidifier control is set to air conditioner .
Available in both set-ups .)
Humidifier Operation Selects when humidification is allowed to occur relative
to heating and fan operation . Without Fan allows
humidification to occur without the HVAC fan . This option
should only be used when the humidifier is independent
of the HVAC system . Note: Without Fan is only available
when Humidifier Installed is set to Yes/Standalone .
CAUTION: When Humidifier Operation is set to Without Fan the thermostat will turn on humidification
without energizing the HVAC fan . Do not select this option when the humidifier is installed on the HVAC duct .
Without airflow moisture can accumulate in the duct resulting in significant damage .
Change Water Panel Selects the when the "Change Water Panel" message is
Reminder displayed .
Reminder Month (Change Change Water Panel Reminder set to 1 per Season:
Water Panel Reminder set Determines the month the "Change Water Panel" message
to 1 per Season) is displayed .
First Reminder Month Change Water Panel Reminder set to 2 per Season:
(Change Water Panel Determines the first month the "Change Water Panel"
Reminder set to 2 per message is displayed .
Season)
Second Reminder Start Determines the second month the "Change Water Panel"
Month message is displayed . (Only available when Change Water
Panel Reminder set to 2 per Season .)
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Factory default setting (bold)
and setting range
No
Yes/On HVAC
Yes/Standalone
Auto
Manual
10 Percent RH
10 to 20 Percent RH
Heat Only
Heat or Fan
Forces Fan
Without Fan
Off
1 Per Season
2 Per Season
300 Hours
600 Hours
October
November
December
January
February
March
April
May
June
July
August
September
October
November
December
January
February
March
April
May
June
July
August
September
SETUP & TESTING

Dehumidifier System Settings Table

Note: Dehumidifier Control can only be set to Whole Home or AC w/IAQ Output if ventilation and humidification are
not installed .
System setting Description
Dehumidifier Control Selects method of dehumidification . If set to None,
no other dehumidifier settings will be available . If
dehumidification is done with the air conditioner,
using the option of AC w/IAQ Output will cause
the IAQ output to be active when overcooling for
dehumidification . This can be used if the HVAC
equipment has a dedicated input to slow the fan
during cooling to maximize dehumidification .
Humidity Setpoint Deadband Select the minimum difference between the humidifier
and dehumidifier setpoints . (Only available if a
humidifier is installed and Dehumidifier Control is set
to Air Conditioner . Available in both set-ups .)
Lockout Dehumidifier During Selects if dehumidification is disabled during a cooling
Cooling call . (Only available if Dehumidifier Control is set to
Whole Home .)
Dehumidifier Forces Fan Select if dehumidification can turn on the fan . (Only
available if Dehumidifier Control is set to Whole
Home .)
Dehumidifier Service The period for displaying the "Dehum Service
Reminder Reminder" message . (Only available if Dehumidifier
Control is set to Whole Home .)
Dehumidifier Overcooling Selects the amount of overcooling that can occur
Limit for dehumidification . (Only available if Dehumidifier
Control is set to Air Conditioner or AC w/IAQ Output .)
Dehumidify in Vacation Selects if dehumidification with the air conditioner is
Mode done in Vacation Mode . (Only available if Dehumidifier
Control is set to Air Conditioner or AC w/IAQ Output .
Vacation Dehumidifier Low Sets the lowest temperature the air conditioner will
Temp Limit cool to, to meet RH setpoint in Vacation Mode . (Only
available if Dehumidifier Control is set to Air Conditioner
or AC w/IAQ Output .)
Factory default setting (bold)
and setting range
None (no dehumidification installed)
Whole Home
Air Conditioner
AC w/IAQ Output
10 Percent RH
10 to 20 Percent RH
No
Yes
No
Yes
Off
1 to 12 months or "Off" to disable
3°F (1.5°C)
1°F to 3°F (0 .5°C to 1 .5°C)
No
Yes
75°F (23.5°C)
70°F to 85°F (21°C to 28 .5°C)
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