Aprilaire 8820 Setup guide

READ AND SAVE THESE INSTRUCTIONS
Safety &
Installation
Instructions
TABLE OF CONTENTS
Installation location recommendations.............3
Outdoor temperature sensor (included).............3
Remote temperature sensor (optional) .............4
Thermostat mounting...........................4
Power & reset options..........................5
Wiring terminal ...............................5
INSTALLATION
SETUP & TESTING
REFERENCES
WIRING DIAGRAMS
Equipment type selection switch (SW1) ............8
Installer setup menu ...........................8
Change system settings.........................8
Thermostat installer system settings table.......9-10
Indoor Air Quality system settings tables.......11-15
Air cleaning system settings table..............11
Humidifier system settings table ...............12
Dehumidifier system settings table .............13
Ventilation system settings table............14-15
Removal of Indoor Air Quality control buttons ......16
System test menu ......................... 16-17
System test tables.........................18-19
Quick reference to controls & display.............20
Troubleshooting ...........................21-22
Error codes ..................................22
Thermostat features ..........................23
Specifications................................23
Conventional heat/cool single transformer..........6
Conventional heat/cool two transformer ...........6
Heat pump single transformer....................6
Heat pump two transformer .....................6
Indoor Air Quality equipment – dehumidifier . . . . . . . .7
Indoor Air Quality equipment – humidifier . . . . . . . . . .7
Indoor Air Quality equipment – ventilation..........7
Support module ...............................7
Model 8820 Touch Screen Wi-Fi
Automation Thermostat with
Integrated Indoor Air Quality Solutions
Wi-Fi Setup ..................................2
WI-FI SETUP

2 3
STEP 1
STEP 2
WI-FI SETUP
Verify the thermostat is in
Wi-Fi Connection Mode.
The thermostat by default will be in Wi-Fi Connection
Mode. To confirm that the thermostat is in Wi-Fi
Connection Mode, verify that the radio bars on the
thermostat are strobing as shown below.
Note: If the thermostat is not in Wi-Fi Connection
Mode, refer to the Owner’s Manual for instructions on
clearing the Wi-Fi settings.
To connect the 8820 thermostat to a Wi-Fi network follow the steps below.
Note: You will need a computer or mobile device with Wi-Fi and a web browser.
Connect to the thermostat using a
computer or mobile device.
On your computer or mobile device, scan for
available networks. The thermostat should appear
as APRILAIRE8820 followed by a unique identifier,
corresponding to the last 6 digits of the MAC address.
Connect to the thermostat you want to configure.
If you are installing multiple thermostats, the MAC
address of each thermostat will be displayed in the
message center on the display of the thermostat. The
MAC address can also be found by removing the cover
on the front of the thermostat.
Configure the thermostat to connect
to the Wi-Fi network.
Open a web browser on your computer or mobile
device. In the browser enter:
http://192.168.1.99/index.html
In the web browser interface select the network you
want to connect the thermostat to, and enter the
network’s security credentials.
STEP 3
STEP 4
Verify the thermostat is connected
to the Wi-Fi network.
Once all the required information is entered in the
web browser interface, the thermostat will connect to
the Wi-Fi network you selected. After the thermostat
is connected to the Wi-Fi network, the thermostat
will display the radio bars based on the Wi-Fi signal
strength. If the radio bars are not displaying the signal
strength, refer to Troubleshooting Wi-Fi Connection on
page 22.
Note: If you are not using the thermostat with a
home automation system, but are instead using an
Aprilaire account to communicate with the thermostat,
Automation Enable must be set to Aprilaire Cloud in
the installer setup menu, refer to pages 8 & 9. Go to
my.aprilaire.com and refer to Wi-Fi Thermostat
App User Guide and then StartUp for instructions
on connecting to Wi-Fi and registering to an Aprilaire
account.
INSTALLATION
INSTALLATION LOCATION RECOMMENDATIONS
Thermostat should be mounted:
• On an interior wall, in a frequently occupied space.
• Approximately 5‘ above floor.
• At least 18” from outside wall.
• Thermostat can be mounted to a vertical junction box.
Do not mount thermostat:
• Behind doors, in corners or other dead air spaces.
• In direct sunlight, near lighting fixtures, or other
appliances that give off heat.
• On an outside or unconditioned area wall.
• In the flow of a supply register, in stairwells, or near
outside doors.
• On a wall with concealed pipes or ductwork.
OUTDOOR TEMPERATURE SENSOR (INCLUDED)
Heat pump models can use the outdoor temperature to effectively utilize the heat pump:
• When the outdoor temperature is less than the Low Balance Point, the heat pump will be locked out and only
auxiliary heating will be used to provide heating.
• When the outdoor temperature is higher than the High Balance Point, the auxiliary heating will be locked out and
only the heat pump will be used to provide heating.
Indoor Air Quality functions can use the outdoor temperature sensor to:
• Control humidification setpoint based on outdoor temperature to prevent condensation.
• Lock out humidification for temperatures over 60°F or below -30°F.
• Lock out ventilation based on high and/or low outdoor temperatures.
• Display outdoor temperature on thermostat.
Outdoor temperature sensor should be mounted:
• On side of building out of direct sunlight (north side recommended).
• Above snow line.
• At least 3’ away from exhaust vents and condensing lines.
• Using less than 300’ of wire.
• Do not route wires along 120 VAC lines.
GY2YO/BI1 WRC RW2S2L
CS
1T1T2I2
RSARSB
Outdoor temperature can be measured by attaching the included 8052 sensor to the S1 and S2 terminals. The
outdoor sensor must be enabled in the installer setup menu.
90-2074

4 5
REMOTE TEMPERATURE SENSOR (OPTIONAL)
A remote temperature sensor can be used for control if the thermostat is to be mounted in a concealed location
or a remote sensor can be averaged with the thermostat sensor to control a large space. An 8051 flush mount
or 8053 surface mount remote temperature sensor can be attached to the T1 and T2 terminals and mounted in a
recommended area. The remote sensor must be enabled in the installer setup menu, and once enabled will override
or be averaged with the thermostat’s internal temperature sensor, based on the setting.
Do not mount remote sensor:
• Behind doors, in corners or other dead air spaces.
• In direct sunlight, near lighting fixtures, or other
appliances that give off heat.
• On an outside or unconditioned area wall.
• In the flow of a supply register, in stairwells, or near
outside doors.
• On a wall with concealed pipes or ductwork.
• Near 120 VAC lines.
GY2YO/BI1 WRC RW2S2L
CS
1T1T2I2
RSARSB
Remote temperature sensor should be mounted:
• On an interior wall, in a frequently occupied space.
• Approximately 5‘ above floor.
• At least 18” from outside wall.
• Using less than 300’ of wire.
THERMOSTAT MOUNTING
1. Remove the rear mounting plate from the thermostat.
2. Pull wires through the opening on the back of the rear
mounting plate.
3. Position and level the mounting plate of the thermostat
on wall and mark the hole locations with a pencil.
4. Drill 1/4” holes and insert supplied anchors
(drywall only).
5. Place mounting plate over anchors, insert and tighten
screws.
6. Seal wire entry holes to prevent drafts affecting
temperature readings.
INSTALLATION
90-2075
90-2076
WIRING TERMINAL
Wire specifications:
18-24 gauge thermostat wire
Installation notes:
• Ensure power at the HVAC
equipment is off.
• Loosen screw terminals, insert
stripped wire and re-tighten.
• Push the excess wire back into
the opening and plug the wall
opening to prevent drafts.
INSTALLATION
RSB & RSA – Model 8081 or 8082 Support Module communication
I1 & I2 – Indoor Air Quality control output
C– Common
O/B – Reversing valve
Y– First stage cooling (conventional) / First stage compressor (heat pump)
Y2 – Second stage cooling (conventional) / Second stage compressor (heat pump)
G– Fan
RC – 24VAC supply cooling1
R– 24VAC supply heating1
W2 – Second stage heat (conventional) / Second stage auxiliary (heat pump)
W– First stage heat (conventional) / First stage auxiliary (heat pump)
L– System fault indicator (optional) (heat pump only)
S1 & S2 – outdoor temperature sensor (included)
T1 & T2 – remote temperature sensor (optional)
1Jumper between RC & R is used in single transformer systems (see wiring diagrams).
GY2YO/BI1 WRC RW2S2L
CS
1T1T2I2
RSARSB
POWER & RESET OPTIONS
The thermostat is powered from 24VAC. In the case of
power loss the thermostat will maintain the clock for 24
hours. The thermostat has a memory backup that saves
the thermostat settings in case of power interruption.
The reset button located under the cover on the front of
the thermostat can be used to reset the thermostat to
factory defaults. The Installer System Settings will also
be set to the default settings.
RESET
BUTTON
90-2012
90-2077

6 7
INSTALLATION
SINGLE TRANSFORMER (USE JUMPER WIRE) TWO TRANSFORMERS (REMOVE JUMPER WIRE)
JUMPER
OUTDOOR TEMP
SENSOR
1st HEATING
1st COOLING
FAN
2nd HEATING
2nd COOLING
NOT USED
TRANSFORMER
REMOTE TEMP
SENSOR
NOT USED
GY2YO/BI1 WRC RW2S2LCI2 S1 T1 T2 RSB RSA
NOT USED
2nd COOLING
2nd HEATING
FAN
1st COOLING
1st HEATING
OUTDOOR TEMP
SENSOR
COOLING
HEATING
REMOTE TEMP
SENSOR
NOT USED
TRANSFORMER
TRANSFORMER
GY2YO/BI1 WRC RW2S2LCI2 S1 T1 T2 RSB RSA
SINGLE TRANSFORMER (USE JUMPER WIRE) TWO TRANSFORMERS (REMOVE JUMPER WIRE)
2nd COMPRESSOR
2nd AUX HEATING
FAN
1st COMPRESSOR
1st AUX HEATING
OUTDOOR TEMP
SENSOR
JUMPER
FAULT DETECT
REVERSING VALVE
TRANSFORMER
REMOTE TEMP
SENSOR
GY2YO/BI1 WRC RW2S2LCI2 S1 T1 T2 RSB RSA
FAULT DETECT
OUTDOOR TEMP
SENSOR
1st AUX HEATING
1st COMPRESSOR
FAN
2nd AUX HEATING
2nd COMPRESSOR
TRANSFORMER
HEAT PUMP
HEATING
TRANSFORMER
REMOTE TEMP
SENSOR
REVERSING VALVE
GY2YO/BI1 WRC RW2S2LCI2 S1 T1 T2 RSB RSA
CONVENTIONAL HEAT/COOL WIRING DIAGRAMS
HEAT PUMP WIRING DIAGRAMS
90-207890-2078
90-207990-2079
Note: The I1/I2 output is a dry contact closure.
The humidifier wiring diagram assumes the control is
powering a solenoid valve. The dehumidifier wiring
diagram is for a normally open dry contact input.
The ventilation diagram assumes the control is for
a normally closed damper. Refer to the individual
humidifier, dehumidifier or ventilation installation
instructions for product specific wiring details.
Note: Up to four Support Modules can be wired to the
thermostat. Support Modules should be wired with
CAT-5 wire. The total length of wire for all support
modules should not exceed 1000 feet.
DEHUMIDIFIER WIRING HUMIDIFIER WIRING
VENTILATION WIRING
DEHUMIDIFIER
GY2YO/BI1 WRC RW2S2LCI2 S1 T1 T2 RSB RSA
HUMIDIFIER
TRANSFORMER
GY2YO/BI1 WRC RW2S2LCI2 S1 T1 T2 RSB RSA
NORMALLY CLOSED DAMPER
TRANSFORMER
GY2YO/BI1 WRC RW2S2LCI2 S1 T1 T2 RSB RSA
GY2YO/BI1 WRC RW2S2LCI2 S1 T1 T2 RSB
RSA
C
RC T3
T2T1 RSARSB T4
MODEL 8081 OR 8082
SUPPORT MODULE
INSTALLATION
INDOOR AIR QUALITY EQUIPMENT WIRING DIAGRAMS
SUPPORT MODULE WIRING DIAGRAM
90-208090-2080
90-2080
90-2080

8 9
SETUP & TESTING
INSTALLER SETUP MENU
CHANGE SYSTEM SETTINGS
HOW TO ENTER THE INSTALLER SETUP MENU AND SELECT EQUIPMENT TO SETUP:
In the Installer Setup menu, Thermostat or Indoor Air Quality (IAQ) setup can be selected. If IAQ setup is selected, the
user can then select to set up Air Cleaning, Humidification, Dehumidification or Ventilation.
Press [MODE] to set system to OFF.
Press [MENU] to enter main menu.
Press and hold [SETUP] for seven seconds, [INSTALL
SETUP] appears.
Press [INSTALL SETUP] to enter installer setup menu.
Press or to adjust the option.
Press [MENU] to exit.
Press [NEXT] to select option.
Note: If IAQ is selected prior to performing thermostat
setup, the Installer System Setting for Outdoor Sensor
will be presented prior to entering IAQ setup.
Press [NEXT] or [BACK] to page through the settings.
Press or to adjust the setting.
Press [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.
To reset the Installer System Settings to the default
settings, reset the thermostat by pressing the [RESET]
button for 5 seconds.
EQUIPMENT TYPE SELECTION SWITCH (SW1)
This thermostat has the option of being used in heat
pump or heat/cool systems. Switch SW1 located on the
back of the thermostat’s face is used to select this option.
This setting is displayed in the Installer System Settings
under Equipment Type.
HC
HP
SW1
HEAT/COOL
HEAT PUMP
HC
HP
SETTING
NUMBER
SETTING
DESCRIPTION
SETTING
OPTIONS
SETUP & TESTING
The following table contains the system settings and their details. Default settings are shown in bold. Some settings
are only available dependent upon the value of other settings.
THERMOSTAT INSTALLER SYSTEM SETTINGS TABLE
System setting Description
Factory default setting (bold)
and setting range
00. Automation Enable Selects if the thermostat connects with an
automation system or an Aprilaire account.
0: Aprilaire Cloud
1: Automation System
01. Equipment Type Equipment type set by SW1. Heat/Cool
Heat Pump
02. Temperature Scale Set the thermostat to Fahrenheit or Celsius mode. Fahrenheit
Celsius
03. Reversing Valve Selects O or B operation. O – On in cooling
B – On in heating
04. Control Setup Used to lockout heating or cooling outputs.
Note: Only available if Equipment Type is set to
Heat/Cool.
Heat and Cool
Heat Only
Cool Only
05. Heat/Cool: Cooling Stages
Heat Pump: Compressor
Stages
Heat/Cool: Number of Cooling Stages.
Heat Pump: Number of Compressor Stages.
One
Two
06. Heat/Cool: Heating Stages
Heat Pump: Aux Heat
Stages
Heat/Cool: Number of Heat Stages.
Heat Pump: Number of Auxiliary Heat Stages.
One
Two
07. Heat/Cool: Fan Control
in Heating
Heat Pump: Auxiliary
Equipment Type
Heat/Cool: Determines if the thermostat or
equipment controls the fan in heating.
Heat Pump: Auxiliary Equipment type.
Gas/Oil Heat (equipment controls fan)
Electric Heat (thermostat controls fan)
08. Extended Fan – Heat Extends fan operation after heat call ends. Disable
Enable (90 second extension)
09. Extended Fan – Cool Extends fan operation after cool call ends. Disable
Enable (90 second extension)
10. Temperature Sensor Offset Field adjustment of controlling temperature
sensor(s).
0° (no offset applied)
-4°F to +4°F (-2°C to +2°C)
11. Humidity Offset Field adjustment of internal RH sensor. 0 (no offset applied)
-5% to +5%
12. Auto Changeover Enable or disable Auto Changeover mode. Disable
Enable
13. Deadband Auto Changeover mode deadband. 3°F (1.5°C)
2°F to 9°F (1°C to 4.5°C)
14. Remote Sensor Select if remote sensor is attached, and if it is
attached, if it is the primary control or averaged
with the built-in sensor. If the remote sensor is
the primary control it can be configured to use the
built-in sensor as a back-up sensor.
Not installed
Control no backup
Control with built-in backup
Average with thermostat built-in sensor
15. Outdoor Sensor Selects if an outdoor temperature sensor is not
installed, a wired sensor is installed, or the outdoor
temperature is provided by the automation system.
Note: Automation is only available if Automation
Enable is set to Automation System.
Not installed
Installed
Automation
18. Compressor Min Off Time Minimum off time for compressor protection. 5 minutes
1 to 5 minutes
19. Heating Min Off Time Minimum off time for heating. 2 minutes
1 to 5 minutes
20. Equipment Min On Time Minimum on time for heating and cooling. 2 minutes
1 to 5 minutes
21. Auto Changeover Time Minimum time between heating and cooling calls. 4 minutes
1 to 5 minutes

10 11
System setting Description
Factory default setting (bold)
and setting range
22. First Stage Differential First stage differential. 1°F (0.5°C)
1°F to 9°F (0.5°C to 4.5°C)
23. Second Stage Differential Second stage differential. 1°F (0.5°C)
1°F to 9°F (0.5°C to 4.5°C)
24. Third Stage Differential Third stage differential. 1°F (0.5°C)
1°F to 9°F (0.5°C to 4.5°C)
25. Fourth Stage Differential Fourth stage differential. 1°F (0.5°C)
1°F to 9°F (0.5°C to 4.5°C)
26. Away Enables the Away feature. The Away feature
allows the automation system or Aprilaire mobile
and web apps to use a single button press to set
the thermostat to a predefined setpoint(s). The
thermostat will hold the setpoint(s) until Away is
canceled with the automation system or app or at
the thermostat.
Disable
Enable
27. Heat Blast Enables the Heat Blast feature. Disable
Enable
28. Blast Offset Amount of heating when Heat Blast is initiated. 3°F (1.5°C)
3°F to 5°F (1.5°C to 2.5°C)
37. Stage Rate Accumulation of equipment run time in equipment
staging determination.
1 = more rapid staging of equipment (comfort).
5 = slower staging of equipment (economy).
2
1 to 5 or “OFF” to ignore accumulated
run time.
38. Progressive Recovery Enable or disable progressive recovery. Disable
Enable
39. Low Balance Point Outdoor temperature low balance point.
Note: This option is only available if the thermostat
is set to Heat Pump and Outdoor Sensor is set to
Installed or Automation.
20°F or -8°C
0°F to 60°F (-18°C to 12°C) or OFF to
ignore LBP
40. High Balance Point Outdoor temperature high balance point.
Note: This option is only available if the thermostat
is set to Heat Pump and Outdoor Sensor is set to
Installed or Automation.
65°F or 14.5°C
0°F to 80°F (-18°C to 22°C) or OFF to
ignore HBP
41. Program Format Enables the 7-day program. 7-Day
Non-Prog
42. Reset Service Reminders Clears the Air Filter, Dehumidifier, Fresh Air, and
HVAC service reminders if they are active and
resets the start date to the current date. Clears the
Change Water Panel reminder if it is active. If the
reminder is set to Timed, the clock will be reset.
No
Yes
43. HVAC Service Reminder The period for displaying the “HVAC Service
Reminder” message.
Off
1 to 12 months or “Off” to disable
44. Constant Backlight Enable constant, low intensity backlight. Disable
Enable
45. Backlight Intensity Set the active backlight intensity.
Note: The minimum setting is 40% when Constant
Backlight is enabled.
100 Percent
0 to 100 Percent
51. Support Module
Controlling Temp Sensors
Sets the number of controlling support module
temperature sensors.
NONE
1 to 8
52. Support Module
Controlling RH Sensors
Sets the number of controlling support module
humidity sensors.
NONE
1 to 4
53. Display Monitor Support
Module Sensor
Selects if the temperature or humidity values
from support modules that are configured for
monitoring are displayed in the message center of
the thermostat.
No
Yes
SETUP & TESTING
HVAC INSTALLER SYSTEM SETTINGS TABLE (CONTINUED)
SETUP & TESTING
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 thermostat system settings, thermostat system setting 15,
outdoor sensor, will be presented prior to entering the Indoor Air Quality system settings.
Please refer to the Model 8820 Owner’s Manual for further information about thermostat features.
Air Cleaning System Settings Table
System setting Description
Factory default setting (bold)
and setting range
Air Cleaner Installed Selects if an air cleaner is installed. (If set to no, no other
air cleaning settings will be available.)
No
Yes
Change Air Filter Reminder The period for displaying the “Change Air Filter” message. Off
1 to 12 months or “Off” to disable
INDOOR AIR QUALITY SYSTEM SETTINGS TABLES

12 13
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
Factory default setting (bold)
and setting range
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.)
No
Yes/On HVAC
Yes/Standalone
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.)
Auto
Manual
Humidity Setpoint
Deadband
Selects 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.)
10 Percent RH
10 to 20 Percent RH
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.
Heat Only
Heat or Fan
Forces Fan
Without Fan
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
Reminder
Selects the when the “Change Water Panel” message is
displayed.
Off
1 Per Season
2 Per Season
300 Hours
600 Hours
Reminder Month (Change
Water Panel Reminder set
to 1 per Season)
First Reminder Month
(Change Water Panel
Reminder set to 2 per
Season)
Change Water Panel Reminder set to 1 per Season:
Determines the month the “Change Water Panel” message
is displayed.
Change Water Panel Reminder set to 2 per Season:
Determines the first month the “Change Water Panel”
message is displayed.
October
November
December
January
February
March
April
May
June
July
August
September
Second Reminder Start
Month
Determines the second month the “Change Water Panel”
message is displayed. (Only available when Change Water
Panel Reminder set to 2 per Season.)
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
Factory default setting (bold)
and setting range
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.
None (no dehumidification installed)
Whole Home
Air Conditioner
AC w/IAQ Output
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.)
10 Percent RH
10 to 20 Percent RH
Lockout Dehumidifier During
Cooling
Selects if dehumidification is disabled during a cooling
call. (Only available if Dehumidifier Control is set to
Whole Home.)
No
Yes
Dehumidifier Forces Fan Select if dehumidification can turn on the fan. (Only
available if Dehumidifier Control is set to Whole
Home.)
No
Yes
Dehumidifier Service
Reminder
The period for displaying the “Dehum Service
Reminder” message. (Only available if Dehumidifier
Control is set to Whole Home.)
Off
1 to 12 months or “Off” to disable
Dehumidifier Overcooling
Limit
Selects the amount of overcooling that can occur
for dehumidification. (Only available if Dehumidifier
Control is set to Air Conditioner or AC w/IAQ Output.)
3°F (1.5°C)
1°F to 3°F (0.5°C to 1.5°C)
Dehumidify in Vacation
Mode
Selects if dehumidification with the air conditioner is
done in Vacation Mode. (Only available if Dehumidifier
Control is set to Air Conditioner or AC w/IAQ Output.
No
Yes
Vacation Dehumidifier Low
Temp Limit
Sets the lowest temperature the air conditioner will
cool to, to meet RH setpoint in Vacation Mode. (Only
available if Dehumidifier Control is set to Air Conditioner
or AC w/IAQ Output.)
75°F (23.5°C)
70°F to 85°F (21°C to 28.5°C)

14 15
SETUP & TESTING
Ventilation System Settings Table
Note: Ventilation can only be installed if humidification is not installed and Dehumidifier Control is not set to Whole
Home or AC w/IAQ Output.
System setting Description
Factory default setting (bold)
and setting range
Fresh Air Vent Installed Selects if ventilation is installed. (If set to No, no
other ventilation settings will be available.)
No
Yes
Fresh Air Setup Type Selects if ventilation is configured through the
Code setup or Comfort. Comfort setup has more
lockout options. Code setting ensures missed
lockout time is made up.
Comfort
Code
Number of Bedrooms Selects the number of bedrooms to be used for
the Calculated Minutes per Hour.
3 Bedrooms
1 to 10 Bedrooms
Home Size Selects the size of the home to be used for the
Calculated Minutes per Hour.
2500 SQ FT
500 to 7500 SQ FT
Measured CFM Selects the ventilation CFM to be used for the
Calculated Minutes per Hour.
110 CFM
30 to 250 CFM
Calculated Minutes per Hour Displays the Fresh Air Time calculated. None
Range 6 to 60 Minutes
Override Manual adjustment of Calculated Minutes per
Hour.
(Calculated Minutes per Hour)
Range 6 to 60 Minutes
Enable High Vent RH Limit Selects if ventilation is disabled if the indoor RH
exceeds the indoor RH limit. (Only available if
Fresh Air Setup is set to Comfort.)
Yes
No
High Vent RH Limit Sets the ventilation indoor RH lockout limit.
(Only available if Enable High Vent RH Limit is
set to Yes.)
55%
45% to 70%
Enable Low Vent RH Limit Selects if ventilation is disabled if the indoor RH
exceeds the indoor RH limit. (Only available if
Fresh Air Setup is set to Comfort.)
No
Yes
Low Vent RH Limit Sets the ventilation indoor RH lockout limit.
(Only available if Enable Low Vent RH Limit is
set to Yes.)
20%
10% to 30%
Enable High Vent Temperature Limit Enables high ventilation temperature lockout
limit. (Only available if Outdoor Sensor is set to
Installed or Automation.)
No
Yes
High Vent Temperature Limit Sets high ventilation temperature lockout limit.
(Only available if Enable High Vent Temperature
Limit is set to Yes.)
100°F (38°C)
85°F to 105°F (29°C to 41°C)
Enable Low Vent Temperature Limit Enables low ventilation temperature lockout
limit. (Only available if Outdoor Sensor is set to
Installed or Automation.)
No
Yes
System setting Description
Factory default setting (bold)
and setting range
Low Vent Temperature Limit Sets low ventilation temperature lockout limit.
(Only available if Enable Low Vent Temperature
Limit is set to Yes.)
10°F (-12°C)
-10°F to 40°F (-24°C to 6°C)
HVAC Fan with Vent Selects if ventilation forces the fan on. (Yes with
high and low limits is only available if Outdoor
Sensor is set to Installed or Automation.)
Yes
Yes with high and low limits
No
Enable High Mixing Temperature Enables high mixing temperature. (Only available
is HVAC Fan with Vent is set to Yes with high
and low limits.)
No
Yes
High Mixing Temperature Sets the high mixing temperature. (Only
available if Enable High Mixing Temperature is
set to Yes.)
80°F or (26°C)
60°F to 105°F (14°C to 41°C)
Enable Low Mixing Temperature Enables low mixing temperature. (Only available
is HVAC Fan with Vent is set to Yes with high
and low limits.)
No
Yes
Low Mixing Temperature Sets the Low mixing temperature. (Only available
if Enable Low Mixing Temperature is set to Yes.)
40°F (6°C)
0°F to 50°F (-18°C to 12°C)
Fresh Air Service Reminder The period for displaying the “SERVICE FRESH
AIR” message.
OFF
1 to 12 months or “OFF” to disable
Note: Refer to manuals for humidifier, dehumidifier, air cleaner, and ventilation products for recommended installation
and operation.
SETUP & TESTING

16 17
SETUP & TESTING
REMOVAL OF INDOOR AIR QUALITY CONTROL BUTTONS
Step 1: Verify the specific Indoor Air
Quality control feature is not
installed in the Installer System
Settings (see pages 11-14).
Step 2: From the home screen (see
page 20), press and hold the
Indoor Air Quality button you
wish to remove for 7 seconds.
Step 3: The message center will
display REMOVE BUTTON and
the options of NO and YES
(NO will be flashing).
Step 4: Press or to select YES.
Step 5: Press [DONE].
Step 6: The button is now removed.
Note: Once the button is removed it can be brought back by installing the corresponding Indoor Air Quality feature
(see pages 11-14).
If any of the Indoor Air Quality control features are not installed, the corresponding button can be removed using the
following procedure:
INDOOR
AIR QUALITY
CONTROL
BUTTONS
SYSTEM TEST MENU
The system test menu is used to test a system after installation. The outputs of the thermostat can be manually
activated to test their function. The instructions below show how to enter the test mode and turn outputs on and off.
SYSTEM TEST STEPS
Heating equipment test
Cooling equipment test
Fan equipment test
Humidification equipment test
Dehumidification equipment test
Ventilation equipment test
HOW TO ENTER THE SYSTEM TEST MENU:
Press [MODE] to set system to off.
Press and hold [FAN] and [MODE] for three seconds
to enter system test mode.
The first screen of the installer test displays the
equipment configuration.
Press [NEXT] to enter the first installation test or
[CANCEL] to exit.
TEMPERATURE
HUMIDITY
OUTDOOR
TEMPERATURE
EQUIPMENT
CONFIGURATION
SYSTEM TEST MENU (CONTINUED)
While the equipment test is active the corresponding test information will be shown.
Press [NEXT] to accept the selection and proceed to the next test selection.
SETUP & TESTING
Each equipment test will begin with the selection of turning on the output or stage as shown below.
Press or to change the selection.
Press [NEXT] to accept the selection and proceed to the next step.
If YES is selected, the thermostat will test the corresponding output. If NO is selected, the thermostat will proceed
to the next step.
TEMPERATURE
EQUIPMENT TEST
SELECTION
HUMIDITY
OUTDOOR
TEMPERATURE
TEST TO BE RUN
TEMPERATURE
LEAVING AIR
TEMPERATURE
EQUIPMENT TEST
SELECTION
HUMIDITY
OUTDOOR
TEMPERATURE
OUTPUT STATUS
TEST THAT
IS ACTIVE

18 19
SETUP & TESTING
SYSTEM TEST TABLES
Heat / Cool Heating Equipment Test
Heat Type W W2 Y Y2 G
Gas 1st Stage Test ON
Gas 2nd Stage Test ON ON
Electric 1st Stage Test ON ON
Electric 2nd Stage Test ON ON ON
Heat Pump Heating Equipment Test (Electric Heat)
Compressor
Stages
Aux
Stages W W2 Y Y2
O/B set to
GO B
1 1 1st Stage Test ON ON ON
1 1 2nd Stage Test ON ON ON ON
2 1 1st Stage Test ON ON ON
2 1 2nd Stage Test ON ON ON ON
2 1 3rd Stage Test ON ON ON ON ON
1 2 1st Stage Test ON ON ON
1 2 2nd Stage Test ON ON ON ON
1 2 3rd Stage Test ON ON ON ON ON
2 2 1st Stage Test ON ON ON
2 2 2nd Stage Test ON ON ON ON
2 2 3rd Stage Test ON ON ON ON ON
2 2 4th Stage Test ON ON ON ON ON ON
Note: System Variable 03, O/B operation selects O or B.
Heat Pump Heating Equipment Test (Gas Heat)
Compressor
Stages
Aux
Stages W W2 Y Y2
O/B set to
GO B
1 1 1st Stage Test ON ON ON
1 1 2nd Stage Test ON ON
2 1 1st Stage Test ON ON ON
2 1 2nd Stage Test ON ON ON ON
2 1 3rd Stage Test ON ON
1 2 1st Stage Test ON ON ON
1 2 2nd Stage Test ON ON
1 2 3rd Stage Test ON ON ON
2 2 1st Stage Test ON ON ON
2 2 2nd Stage Test ON ON ON ON
2 2 3rd Stage Test ON ON
2 2 4th Stage Test ON ON ON
Note: System Variable 03, O/B operation selects O or B.
Heat / Cool Cooling Equipment Test
W W2 Y Y2 G
1st Stage Test ON ON
2nd Stage Test ON ON ON
Heat Pump Cooling Equipment Test
W W2 Y Y2
O/B set to
GO B
1st Stage Test ON ON ON
2nd Stage Test ON ON ON ON
Note: System Variable 03, O/B operation selects O or B.
Fan Equipment Test
W W2 Y Y2 G
ON
Humidification Equipment Test
I1/ I2 G
ON ON
Dehumidification Equipment Test
I1/ I2 G
ON ON
Ventilation Equipment Test
I1/ I2 G
ON ON
SETUP & TESTING
SYSTEM TEST TABLES (CONTINUED)

20 21
QUICK REFERENCE TO CONTROLS & DISPLAY
HOME SCREEN
MAIN MENU
NOTE: BACKLIGHT IS ACTIVATED WITH FIRST BUTTON PRESS AND AUTOMATICALLY TURNS OFF.
FAN MODE
BUTTON
FAN MODE
SETTING
SYSTEM MODE
BUTTON
SYSTEM MODE
SETTING
WI-FI SIGNAL STRENGTHCURRENT TIME & DATE MAIN MENU BUTTONHEAT BLAST BUTTON
TEMPERATURE ADJUSTMENT
AIR CLEANING BUTTON
(ENTERS EVENT-BASED™AIR
CLEANING CONTROL SCREEN)
HUMIDITY CONTROL BUTTON
(ENTERS HUMIDITY CONTROL
SCREEN)
FRESH AIR BUTTON (ENTERS
VENTILATION CONTROL SCREEN)
HOLD BUTTON
(SETS OR CLEARS HOLD)
HEAT PUMP ONLY
EMERGENCY HEAT OR
AUXILIARY HEAT (RED)
SYSTEM FAULT (YELLOW)
MAINTENANCE REMINDER
(YELLOW FLASHING)
INDICATORS SHOW THROUGH HOUSING
EQUIPMENT
STATUS
MESSAGE
CENTER
(SCROLLING TEXT)
ROOM TEMPERATURE CURRENT DAY TEMPERATURE SETTINGOUTDOOR TEMPERATURE ROOM RELATIVE HUMIDITY
SET SCHEDULE
BUTTON
INSTALLER/USER SYSTEM SETTING
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)
TROUBLESHOOTING
DISPLAY IS BLANK
• Check circuit breaker and reset if necessary.
• Make sure power switch at heating & cooling
system is on.
• Make sure furnace door is closed securely.
HEATING SYSTEM DOES NOT RESPOND
(“HEATING” APPEARS ON SCREEN)
• Check for 24VAC at the equipment on the secondary
side of the transformer between power and
common. If voltage is not present, check the heating
equipment to find the cause of the problem.
• Check for 24VAC between the heat terminal (W)
and the transformer common. If 24VAC is present,
the thermostat is functional. Check the heating
equipment to find the cause of the problem.
• Check for loose or broken wires between the
thermostat and the heating equipment.
TEMPERATURE SETTINGS DO NOT CHANGE
Make sure heating and cooling temperatures are set to
acceptable ranges:
• Heat: 40° to 90°F (4° to 32°C).
• Cool: 50° to 99°F (10° to 37°C).
COOLING SYSTEM DOES NOT RESPOND
(“COOLING” APPEARS ON SCREEN)
• Check for 24VAC at the equipment on the secondary
side of the transformer between power and
common. If voltage is not present, check the cooling
equipment to find the cause of the problem.
• Check for 24VAC between the cooling terminal (Y)
and the transformer common. If 24VAC is present,
the thermostat is functional. Check the cooling
system to find the cause of the problem.
• Check for loose or broken wires between the
thermostat and the cooling equipment.
FAN DOES NOT TURN ON IN A CALL FOR HEAT
• Check System Setting 07 (Fan Control), to make sure
the fan control is properly set to match the type of
system (see page 9).
HEAT PUMP ISSUES COOL AIR IN HEAT MODE,
OR WARM AIR IN COOL MODE
• Check System Setting 03 (O/B Operation) to make
sure the reversing valve operation matches the heat
pump.
HEAT/COOL BOTH ON AT SAME TIME
• Check SW1 (Equipment Type), to make sure it is set
to match the installed heating/cooling equipment
(see page 8).
• Check to make sure heating and cooling wires are
not shorted together.
HEATING EQUIPMENT IS RUNNING IN
COOL MODE
• Check SW1 (Equipment Type), to make sure it is set
to match the installed heating/cooling equipment
(see page 8).
“HEATING” IS NOT DISPLAYED
• Check Installer System Setting number 04
(Control Setup) is set correctly.
• Change the System Mode to Heat, and set
the temperature level above the current room
temperature.
“COOLING” IS NOT DISPLAYED
HUMIDIFIER DOES NOT OPERATE IN
AUTO MODE
• Check Installer System Setting number 04
(Control Setup) is set correctly.
• Change the System Mode to Cool, and set
the temperature level below the current room
temperature.
• Check Installer System Setting number 15 (Outdoor
Sensor) is set to Installed or Automation.
• Verify that the outdoor sensor is functioning correctly
or if it is set to Automation that it has not timed
out. If the sensor is functioning correctly the outdoor
temperature will display in the outdoor temperature
location (see Home Screen on page 20 for the
location).

22 23
Wi-Fi connection status Radio status indicator Message Center
Normal Operation. Wi-Fi signal strength is indicated
by the appropriate number of bars.
No corresponding message
The thermostat Wi-Fi settings have not
been entered. Refer to Wi-Fi Setup on
page 2 for instructions for entering the
Wi-Fi settings.
The frame is displayed and the bars cycle
from 0 to 4.
Displays the SSID of the
thermostat. Note: The
SSID will be used to
identify the thermostat
when using a smart device
to connect the thermostat
to your Wi-Fi router.
The thermostat cannot connect to the
Wi-Fi router. Verify that the router is
functioning properly.
The frame and all bars
flash on and off.
WiFi Connection Lost
Indicates the thermostat was not
configured properly when connecting to
the router. Confirm there is no IP conflict
and repeat Wi-Fi setup. Note: If the
thermostat is configured to work with an
Aprilaire account this indicates that the
thermostat cannot connect to the Aprilaire
Cloud. Confirm that the internet connection
is working.
The display will alternate between displaying
the frame and all bars.
Internet Connection Lost
There is an internal error with the
thermostat Wi-Fi radio. The thermostat will
continue to control the HVAC and indoor
air quality control equipment, but will not
be able to connect to Wi-Fi. Contact an
HVAC professional for repair.
The frame will flash on and off. Radio Error
Wi-Fi radio turned off. Refer to the
Accessingg Wi-Fi Settings Menu in the
Owner’s Manual for information about
turning the Wi-Fi radio on.
Not displayed. WiFi Turned Off
ERROR CODES
If the thermostat enters an error mode, all outputs are turned off. The thermostat attempts to recover every 10 minutes.
Error code Message Error Description
01 “SENSOR ERROR” Open temperature sensor circuit
02 Shorted temperature sensor circuit
03 “EEPROM ERROR” Error in permanent memory
06 “REMOTE SENSOR ERROR” Open remote temperature sensor circuit
07 Shorted remote temperature sensor circuit
08 “SUPPORT MODULES LOST” All support modules with controlling
temperature sensors are in error
THERMOSTAT FEATURES
• Remote access and control over Wi-Fi.
• Indoor air quality control.
– Humidification automatic or manual control.
– Dehumidification.
– Event-Based™air cleaning.
– Ventilation with temperature and humidity limits.
• Temperature control.
• Heat Blast®raises the room temperature 3°F to 5°F.
• Large touch screen with adjustable backlight –
constant backlight option available.
• Message center provides feedback and instructions.
• 7 day programmability.
• Displays room temperature, room humidity,
temperature setting, and outdoor temperature.
• Air filter, humidifier, dehumidifier, fresh air, and HVAC
service reminders.
• Programmable fan control with fan circulation mode.
• Easy to use temperature control can override program
schedule at any time.
• Progressive recovery ensures proper temperature at
the start of a program event.
• Built in compressor protection prevents damage to
your equipment.
• System test mode.
Thermal
Outdoor & Remote temperature sensor Maximum distance: 300 feet
Room temperature measurement Display range: 32° to 99°F (0° to 40°C)
Outdoor temperature measurement Display range: -40° to 130°F (-40° to 55°C)
Setpoint temperature range Heat: 40° to 90°F (4° to 32°C)
Cool: 50° to 99°F (10° to 37°C)
Setpoint humidity range Humidification: 10% to 50% R.H.
Dehumidification: 40% to 90% R.H.
SPECIFICATIONS
Electrical
Operating voltage 24VAC (18 – 30VAC)
Current Maximum: 2.5A (total), 1.0A (single output)
Maximum surge current: 5A
Environment
Temperature Operating: 32° to 120°F (0° to 48.9°C)
Shipping: -30° to 150°F (-34.4° to 65.5°C)
Relative humidity Operating: 5% to 90% R.H. (non-condensing)
TROUBLESHOOTING WI-FI CONNECTION
The Wi-Fi connection status is communicated through the use of the radio strength indicator and the message center.
The table below describes the various statuses and the corresponding message and radio bar display.
TROUBLESHOOTING

P.O. Box 1467 • Madison, WI 53701-1467 • Phone: [phone] • Fax: [phone]
www.aprilairepartners.com
61001112 2.17
B2206474D
U.S. Patent Numbers 8,146,376, 8,596,078 and other patents pending.
© 2017 Aprilaire – A division of Research Products Corporation