Thermostat System Settings Table; Indoor Air Quality System Settings Tables; Humidifier System Settings Table - Aprilaire 8920W Safety & Installation Instructions

SETUP & TESTING
HVAC INSTALLER SYSTEM SETTINGS TABLES
Thermostat System Settings Table (continued)
System setting Description
DeadBand Auto Changeover mode deadband .
Auto Changeover Time Minimum time between heating and cooling calls .
Internal Temperature Sensor Field adjustment of controlling temperature sensors .
Offset
Internal RH% Sensor Offset Field adjustment of internal RH sensor .
Equipment Minimum On Time Minimum on time for heating and cooling .
Heating Minimum Off Time Minimum off time for heating .
Compressor Minimum Off Time Minimum off time for compressor protection .
Outdoor Temperature High Enable or disable high balance point (Available if ODT
Balance Point is installed .)
Select High Temperature Balance If outside temperature is above the high balance point
Point the aux heat operation is not allowed . (Available if high
balance point is enabled .)
Outdoor Temperature Low Enable or disable low balance point (Available if ODT is
Balance Point installed .)
Select Low Temperature Balance If outside temperature is below the low balance point
Point the compressor operation is not allowed . (Available if
low balance point is enabled .)
Stage Rate Accumulation of equipment run time in staging
determination .
Factor 1 = more rapid staging of equipment (comfort),
5 = slower staging of equipment (economy) .
First Stage Differential First stage differential .
Second Stage Differential Second stage differential .
Third Stage Differential Third stage differential .
Fourth Stage Differential Fourth stage differential .
Service HVAC Reminder The period for displaying the "HVAC Service reminder"
message .
Number of Months for Recurrence Select number of months for displaying reminder .
12 English
(CONTINUED)
Factory default setting
(bold) and setting range
3°F (1.5°C)
2 to 9°F (1 to 4 .5°C)
4 Minutes
1 to 5 Minutes
0°F (0°C)
-4 to 4°F (-2 to +2°C)
0
-5 to 5
2 Minutes
1 to 5 Minutes
2 Minutes
1 to 5 Minutes
5 Minutes
1 to 5 Minutes
Enabled
Disabled
65°F (14.5°C)
0 to 80°F (-18 to 22°C)
Enabled
Disabled
20°F (-8°C)
0 to 60°F (-18 to 12°C)
Enabled
Disabled
2
1 to 5
1°F (0.5°C)
1 to 9°F (0 .5 to 4 .5°C)
1°F (0.5°C)
1 to 9°F (0 .5 to 4 .5°C)
1°F (0.5°C)
1 to 9°F (0 .5 to 4 .5°C)
1°F (0.5°C)
1 to 9°F (0 .5 to 4 .5°C)
Disabled
Enabled
12 Months
1 to 12 Months
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 an outdoor temperature sensor (recommended) enables additional Indoor Air Quality functionality .
Please refer to the Model 8920W Owner's Manual for further information about thermostat features .
Note: Refer to manuals for humidifier, dehumidifier, air cleaner, and ventilation products for recommended
installation and operation .

Humidifier System Settings Table

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 .)
Display Button? Note: Only available if Humidifier Installed is set
to No .
Outdoor Temperature Sensor Installed? Select if outdoor sensor is attached or not .
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 Yes .)
Allowed 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 .
Humidity Deadband Select the minimum difference between the
humidifier and dehumidifier setpoints . (Only available
if both a humidifier and dehumidifier are installed .)
Humidifier Reminder Selects when the "Change Water Panel" message is
displayed .
Single or First Reminder Appears Determines the month the first (or only) "Change
Water Panel" message is displayed .
Factory default setting
(bold) and setting range
No
Yes/On HVAC
Yes/Standalone
Yes
No
No
Yes
Auto
Manual
Heat Only
Heat or Fan
Forces Fan
Without Fan
10%
10 to 20%
Off
300h Valve
600h Valve
1 per season
2 per season
October
November
December
January
February
March
April
May
June
July
August
September
English 13