Aprilaire 8620 User manual

Model 8620 Thermostat with
Event-Based™Air Cleaning and
Humidity or Ventilation Control
READ AND SAVE THESE INSTRUCTIONS
Owner’s Manual
Includes
Operating Instructions and
Warranty Information

2 3
WARNING
Do not use sharp instruments to press touch screen. Only use your fingertips.
Thermostat features ...........................3
Controls & display overview ...................4-5
TABLE OF CONTENTS
ABOUT YOUR NEW THERMOSTAT
OPERATION
INDOOR AIR QUALITY FUNCTIONS
Select system mode
(EM HEAT/HEAT/OFF/COOL/AUTO)................6
Change temperature set point....................6
Select fan setting (ON/AUTO/CIRC) ...............7
Clean screen .................................7
Maintenance reminders.........................8
Screen lockout ................................8
Battery installation ............................9
Event-Based™air cleaning . . . . . . . . . . . . . . . . . . . 10-11
Humidity control..............................12
Automatic mode ......................... 12-13
Manual mode ...........................14-15
If dehumidification is installed..............16-18
If dehumidification is done with air conditioner ...19
Fresh Air.................................20-21
ABOUT YOUR NEW THERMOSTAT
THERMOSTAT FEATURES

– Humidification automatic or manual control.
– Dehumidification.
– Event-Based™air cleaning.
– Ventilation with temperature and humidity limits.
Note: The 8620 can only control one of the following per installation: ventilation, whole home dehumidifier
or humidifier.

™raises the room temperature 3°F to 5°F.








PROGRAM SCHEDULE AND HOLDS
Set time and date ............................22
Understanding program schedules ............ 23-24
 ..........................24
Changing program schedules ................25-26
Heat Blast™..................................27

Temporary .............................27-28
  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Vacation...............................29-30
SETUP MENU
How to enter the setup menu
to change settings ............................31
 ..................32-33
WARRANTY
Limited warranty .............................34
Warranty registration..........................34

4 5
CONTROLS & DISPLAY OVERVIEW – HOME SCREEN
ABOUT YOUR NEW THERMOSTAT
CONTROLS & DISPLAY OVERVIEW – MAIN MENU
ABOUT YOUR NEW THERMOSTAT
NOTES:

FAN MODE
BUTTON
FAN MODE
SETTING

BUTTON

SETTING

INDICATOR CURRENT TIME & DATE MAIN MENU BUTTONHEAT BLAST BUTTON

AIR CLEANING BUTTON
(ENTERS EVENT-BASED™AIR
CLEANING CONTROL SCREEN)


SCREEN)
FRESH AIR BUTTON (ENTERS
VENTILATION CONTROL SCREEN)
HOLD BUTTON
(SETS OR CLEARS HOLD)
HEAT PUMP ONLY



INDICATORS SHOW THROUGH HOUSING

STATUS
MESSAGE
CENTER
(SCROLLING TEXT)
   
SET SCHEDULE
BUTTON

CLEAN SCREEN
(LOCKOUT TOUCH
SCREEN FOR 30
SECONDS)
SET VACATION HOLD
(HOLD–TO TIME AND DATE)
SET CURRENT
TIME AND DATE
DONE BUTTON
(EXIT MENU)

6 7
OPERATION
Press [MODE] to select:
EM HEAT: (only for heat pumps with auxiliary heat)
Thermostat controls auxiliary heat. Heat pump will not operate
in EM HEAT mode.
HEAT: Thermostat controls only the heating system.
OFF: Heating and cooling systems are off.
COOL: Thermostat controls only the cooling system.
AUTO:
selects heating or cooling depending on the indoor
temperature.
Press [DONE] to save and exit, Or [CANCEL] to exit without
saving. The thermostat will save and exit if nothing is pressed
within 10 seconds.
Press or 

more information.)
SELECT SYSTEM MODE
(EM HEAT/HEAT/OFF/COOL /AUTO)
CHANGE TEMPERATURE SET POINT
Press [MENU] to enter the main menu.
Press [CLEAN SCREEN]
for 30 seconds for cleaning.
Note: Use a soft damp cloth to clean the screen. Use

directly on the screen.
CLEAN SCREENSELECT FAN SETTING (ON/AUTO/CIRC)
Press [FAN] to select:
ON: Fan runs continuously. Use this mode for maximum
air circulation/filtering.
AUTO: Fan runs only when the heating or cooling
system is on.
CIRC:

of energy savings and air circulation/cleaning.
Press [DONE] to save and exit, Or [CANCEL] to exit
without saving. The thermostat will save and exit if
nothing is pressed within 10 seconds.
OPERATION
When the fan mode is changed during a program event
it remains in that mode until the next event starts. The

run continuously through all events.

8 9
OPERATION
MAINTENANCE REMINDERS


maintenance reminder is displayed, call your HVAC

[MENU] to enter the main menu. Press and
press [Next].
Press and 
you would like to reset. Press [Next] to go to the next
reminder or [Back] to go to a previous reminder. Press
[DONE] to reset the selected service reminders.
SCREEN LOCKOUT



holding [MENU] for 7 seconds.
OPERATION




thermostat’s settings in case of a power interruption. The



used to reset the thermostat to factory defaults.
RESET
BUTTON
BATTERY INSTALLATION
WARNING
The reset button should only be used by the installer.

10 11
INDOOR AIR QUALITY FUNCTIONS
Press [AIR CLEANING] on the Home screen to enter
the Air Cleaning screen.
If installed, air cleaning can operate in five different
modes. Air cleaning will activate the fan for the purpose
of air cleaning.
Off: The air cleaner will not call the fan for the purpose
of air cleaning. Note: If air cleaning is installed, air
cleaning will still occur during normal fan operation

Constant Clean: This option will provide the maximum

active for 24 hours a day, seven days a week.
Automatic: The air cleaner will run a minimum of
30 minutes every hour. The air cleaner will monitor
the amount of time your heating and cooling system
runs; if 30 minutes is not reached the air cleaner will
automatically turn on. This will maximize the amount of
air cleaning while minimizing energy consumption.
Event Clean (3 hour cycle): When selected, the air
cleaner will run for 3 hours continuously and then return
to the most recent mode of Off, Automatic, or Constant
Clean. This option only cleans the air when needed; an

Allergies (24 hour cycle): When seasonal allergies


24 hours, then return to the most recent mode of Off,
Automatic, or Constant Clean.
Note: The thermostat will manage fan and air cleaning
selections when the selections overlap.
EVENT-BASED™AIR CLEANING
INDOOR AIR QUALITY FUNCTIONS
Air Cleaning Screen
EVENT-BASED™AIR CLEANING (CONTINUED)
AIR CLEANING MODE
SELECTION
AIR CLEANING MODE

CANCEL BUTTON
(EXIT AIR CLEANING)
DONE BUTTON (SAVE MODE
AND EXIT AIR CLEANING)

12 13
INDOOR AIR QUALITY FUNCTIONS
Press [HUMIDITY CONTROL] on the Home screen to
enter the Humidity Control screen.
The Humidity Control screen is used to access control for


modes, automatic or manual.

To determine which mode the thermostat is set to, see
the diagrams on pages 13 and 15.
HUMIDITY CONTROL
In automatic mode you will receive the optimum
amount of humidity so that your home and its
furnishings are protected from the damaging effects
of excess condensation or low humidity during


temperature.
The humidity setting needs to be set initially to
meet your home’s conditions.


normal range. During the next 24-48 hours it may

humidity, depending on your personal comfort and

2. During the coldest portion of the first heating

dependent upon your home’s construction.

accurately controlled to meet your needs and should not

INDOOR AIR QUALITY FUNCTIONS
Humidity Control Screen for Humidification in Automatic Mode
HUMIDITY CONTROL (CONTINUED)


AUTOMATIC MODE:
INDICATION OF HUMIDIFICATION

DONE BUTTON


14 15
INDOOR AIR QUALITY FUNCTIONS
HUMIDITY CONTROL (CONTINUED)
In manual mode it is important to anticipate a drop in
outdoor temperature and reduce the setting accordingly
to avoid excessive condensation. Use the following

setting.
Outdoor Temperature/Indoor Relative Humidity
Outside Temperature Recommended
Relative Humidity
+50°F 50%
+40°F 45%
+30°F 40%
+20°F 35%
+10°F 30%
0°F 25%
-10°F 20%
-20°F 15%
INDOOR AIR QUALITY FUNCTIONS
Humidity Control Screen for Humidification in Manual Mode
HUMIDITY CONTROL (CONTINUED)


MANUAL MODE:


FOR VARIOUS OUTDOOR

DONE BUTTON


16 17
INDOOR AIR QUALITY FUNCTIONS
HUMIDITY CONTROL (CONTINUED)
If dehumidification is installed the thermostat can

dehumidification with either a whole home dehumidifier
or with the air conditioner (cooling unit).
The thermostat will allow you to set the desired humidity

to turn the dehumidification On or Off.

dehumidification setpoint to 60% when first installed.
Allow dehumidification to run until the initial setpoint

humidity setting.
Raise the setting if you prefer the air to be
less dry; this will reduce the amount of time that
dehumidification runs.
Lower the setting if you prefer the air to be
more dry; this will increase the amount of time that
dehumidification runs.

your setting. When first installed, your dehumidifier
has to remove all the moisture that is initially in your
home. The home acts like a sponge so the moisture in
the materials of your home is at the same level as the
air. After drying the air, the materials of the home will

again at the same level. As a result, it is not uncommon
for dehumidification to operate for an extended period
of time when it is first installed.
INDOOR AIR QUALITY FUNCTIONS
HUMIDITY CONTROL (CONTINUED)
Energy Saving Tip #1:

reduce dehumidification run time – if it feels clammy or
smells damp or moldy lower the setting. To save energy,
turn the dehumidifier control OFF when you open your

Energy Saving Tip #2:
If vacating your home for an extended period in the
summer, set the Relative Humidity at 60% and set

setting it to in cooling mode. Consult with appropriate
professionals regarding the highest temperature that
is safe for your pets or possessions. This will keep
the humidity at a controlled level to help prevent mold
while minimizing the amount of the cooling energy

dehumidification and cooling setpoint when you will


18 19
INDOOR AIR QUALITY FUNCTIONS
Humidity Control Screen with only Dehumidification Installed
HUMIDITY CONTROL (CONTINUED)


DONE BUTTON

INDOOR AIR QUALITY FUNCTIONS
HUMIDITY CONTROL (CONTINUED)
If dehumidification is done with the air conditioner


20 21
INDOOR AIR QUALITY FUNCTIONS
Press [FRESH AIR] on the Home screen to enter the
Fresh Air screen.
If ventilation is installed, Fresh Air can operate in four
different modes.
Off: Ventilation will not run.
Automatic:


3 Hour Event:
for 3 hours and then the fresh air mode will return to Off
or Automatic depending on which was mode was most
recently active. This option is used when fresh air is

24 Hour Event:
for 24 hours and then the fresh air mode will return to
Off or Automatic depending on which was mode was
most recently active. This option is used when a large


FRESH AIR
INDOOR AIR QUALITY FUNCTIONS
Fresh Air Screen
FRESH AIR (CONTINUED)
FRESH AIR MODE SELECTION

CANCEL BUTTON
(EXIT FRESH AIR)
DONE BUTTON (SAVE MODE
AND EXIT FRESH AIR)

22 23
PROGRAM SCHEDULE AND HOLDS
Press [MENU] to enter the main menu.
Press [SET CLK/DATE] to enter clock menu.
SET TIME AND DATE
Press or to set the hour.
Press [Next], then or to set the minute.
Press [Next], then or to set the month.
Press [Next], then or to set the day.
Press [Next], then or to set the year.
Press [DONE] to save and exit, Or [CANCEL] to exit
without saving. The thermostat will save and exit if
nothing is pressed within 20 seconds.
UNDERSTANDING PROGRAM SCHEDULES
PROGRAM SCHEDULE AND HOLDS
The daily schedule is split into four sections:
WAKE: temperature you would prefer to wake up to.
LEAVE: temperature when you are away from the house.
RETURN: temperature you would prefer to return home to.
SLEEP: temperature you would prefer while sleeping.



since they can reduce your heating/cooling expenses. The fan program is pre-set to AUTO for all events.
Event designator Start time
Set temperature
FanHeat Cool
WAKE 6:00AM 70°F (21°C) 78°F (26°C) AUTO
LEAVE 8:00AM 62°F (17°C) 85°F (29°C) AUTO
RETURN  70°F (21°C) 78°F (26°C) AUTO
  62°F (17°C) 82°F (28°C) AUTO

24 25
Event designator Start time
Set temperature
FanHeat Cool
WAKE
LEAVE
RETURN

UNDERSTANDING PROGRAM SCHEDULES (CONTINUED)
PROGRAM SCHEDULE AND HOLDS


Event designator Start time
Set temperature
FanHeat Cool
WAKE 6:00AM 70°F (21°C) 78°F (26°C) AUTO
  62°F (17°C) 82°F (28°C) AUTO
PROGRESSIVE RECOVERY
PRIOR to a
scheduled event in order to reach the desired temperature at the start of that scheduled event.
Example:

PROGRAM SCHEDULE AND HOLDS
Press [Next], then or to set the start time of
the first event.
Press [MENU] to enter the main menu.
Press [SET SCHEDULE] to enter schedule programming.
CHANGING PROGRAM SCHEDULES
Press or to select the day.
Press [Next], then or to set the setpoints of
the first event.
Note: This step is not displayed for weekday/weekend
schedules.

26 27
PROGRAM SCHEDULE AND HOLDS
Press [Next], then [FAN] to set the fan mode of the
first event.
CHANGING PROGRAM SCHEDULES (CONTINUED)
Press [Next] to advance to the next event.

Press [DONE] to save the schedule for the day.

Press [COPY]
programmed to any other day.
OR
Press [CANCEL] to proceed to the next day and repeat

PROGRAM SCHEDULE AND HOLDS
TEMPORARY PROGRAM HOLD
Press or 
when the schedule is running. This will temporarily hold
the temperature setting until the next scheduled event.
PROGRAM SCHEDULE HOLDS – TEMPORARY
Heat Blast™will raise the current room temperature 3°F

normal operation.
Press [Heat Blast] to activate Heat Blast.
Note:
in the Installer Setup and the thermostat is in Heat or
Emergency Heat mode.
To cancel Heat Blast
press [CANCEL], or
[Heat Blast], or the


HEAT BLAST™

28 29
PROGRAM SCHEDULE AND HOLDS
PERMANENT PROGRAM HOLD
Press [HOLD] to permanently hold the temperature at
its current setting while the schedule is running. This
will override the temperature settings for all events.


that setting until the hold is cancelled.
press [CANCEL HOLD].
PROGRAM SCHEDULE HOLDS – PERMANENT
Press or 

the start of the next event.
To cancel the Temporary Hold, press [CANCEL HOLD].
PROGRAM SCHEDULE HOLDS – TEMPORARY
(CONTINUED)
VACATION PROGRAM HOLD
This energy saving feature allows you to suspend the
programmed schedule for extended periods of time. The
temperature and dehumidification setpoint (optional)

vacation program hold end date and time. Once the

programmed schedule will resume. If you return earlier
than expected, press [CANCEL HOLD] to resume the
programmed schedule.
Press or

temperature setting.
Press [MENU] to enter
the main menu.
Press [SET VACATION]
to enter vacation
program hold.
PROGRAM SCHEDULE AND HOLDS
Press [NEXT]
Note: If dehumidification in vacation mode is not

PROGRAM SCHEDULE HOLDS – VACATION

30 31
PROGRAM SCHEDULE AND HOLDS
Press [Next], then or to set end date.
Press [Next], then or to set end time.
Press [DONE] to save and exit, Or [CANCEL] to exit
without saving. The thermostat will save and exit if
nothing is pressed within 20 seconds.
PROGRAM SCHEDULE HOLDS – VACATION (CONTINUED)
Press [Next], then [FAN] to set the fan mode.
SETUP MENU
HOW TO ENTER THE SETUP MENU TO CHANGE SETTINGS
Press [MENU] to enter the main menu.
Press [SETUP] to enter the setup menu.
Press or 
flashes.)
[DONE] to save and exit, Or [CANCEL] to exit
without saving.
The thermostat will discard changes and exit if nothing
is pressed within 60 seconds.
Press [Next] or [Back] to page through the settings
(the setting is displayed in the message center).
MESSAGE CENTER
(SCROLLING TEXT)

32 33
USER SYSTEM SETTINGS TABLE
SETUP MENU
bold.
User system
setting Description Factory default setting (bold) and setting range
Temperature
scale
Set the thermostat to Fahrenheit
or Celsius mode
Fahrenheit
Celsius
Screen lockout Screen lockout level OFF : No lockout

Full lockout
 
lockout is set to partial lockout)
Allow changes to Fan Mode, System Mode and Setpoints
Allow changes to Fan Mode and Setpoints only
Allow changes to Setpoints only
Max Temp Setpoint
Change in Lockout
Select temperature setpoint

screen lockout is set to partial)
3 degrees
0 to 20 degrees
Max Dehum
Setpoint Change in
Lockout
Select dehumidification setpoint

screen lockout is set to partial)
5 percent Relative Humidity
0 to 15 percent Relative Humidity
Events per day 
per day.
4 events per day
2 events per day
USER SYSTEM SETTINGS TABLE (CONTINUED)
SETUP MENU
User system
setting Description Factory default setting (bold) and setting range
Backlight intensity Backlight intensity as a
percentage of full on
100
Selection of 0 – 100%
Daylight savings 
savings
OFF
Second Sunday in March to the first Sunday in November

Reset Service
reminders
Clears the Change Air Filter and
HVAC and Dehumidifier Service
reminders if they are active
and resets the start date to the
current date.

reminder if it is active. If the
reminders is set to timed, the

No


34
Visit us on-line at www.aprilaire.com to register your Aprilaire product. If you do not have on-line access, please mail a postcard with your

Your Warranty Registration information will not be sold or shared outside of this company.
WARRANTY REGISTRATION
THERMOSTAT FIVE YEAR LIMITED WARRANTY
®
in materials or workmanship.
  





             
           





This warranty gives you specific legal rights and you may also have other rights which vary from state to state.
           


 
www.aprilaire.com
10009856 4.12
B2205747B

