Aprilaire Model 8820 Touch Screen Wi-Fi Automation Thermostat

Wi-Fi Setup

To connect the 8820 thermostat to a Wi-Fi network, follow these steps. You will need a computer or mobile device with Wi-Fi and a web browser.

Step 1: Verify the thermostat is in Wi-Fi Connection Mode

The thermostat defaults to Wi-Fi Connection Mode. Confirm this by checking for strobing radio bars on the thermostat display.

If the thermostat is not in Wi-Fi Connection Mode, refer to the Owner's Manual for instructions on clearing Wi-Fi settings.

Step 2: 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 (last 6 digits of the MAC address). Connect to the thermostat you wish to configure.

If installing multiple thermostats, the MAC address for each will be displayed in the message center. The MAC address can also be found by removing the front cover.

Step 3: Configure the thermostat to connect to the Wi-Fi network

Open a web browser on your computer or mobile device and enter: http://192.168.1.99/index.html

In the web browser interface, select the desired network and enter its security credentials.

Step 4: Verify the thermostat is connected to the Wi-Fi network

After entering the required information, the thermostat will connect to the selected Wi-Fi network. The radio bars will then display the Wi-Fi signal strength. If signal strength is not displayed, refer to "Troubleshooting Wi-Fi Connection" on page 22.

If not using a home automation system and instead using an Aprilaire account, set "Automation Enable" to "Aprilaire Cloud" in the installer setup menu (pages 8 & 9). Visit my.aprilaire.com for the Wi-Fi Thermostat App User Guide and startup instructions.

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 heat-generating appliances.
• 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)

The included 8052 sensor can be attached to terminals S1 and S2 to measure outdoor temperature. This sensor must be enabled in the installer setup menu.

Heat pump models can use outdoor temperature for effective heat pump utilization:

• Below the Low Balance Point: Heat pump is locked out; only auxiliary heating is used.
• Above the High Balance Point: Auxiliary heating is locked out; only the heat pump is used.

Indoor Air Quality functions can use the outdoor temperature sensor for:

• Controlling humidification setpoint to prevent condensation.
• Locking out humidification for temperatures over 60°F or below -30°F.
• Locking out ventilation based on high/low outdoor temperatures.
• Displaying outdoor temperature on the thermostat.

Outdoor temperature sensor should be mounted:

• On the side of the building, out of direct sunlight (north side recommended).
• Above the 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.

Wiring Terminal Diagram Reference: RSB RSA I2 C I1 O/B Y Y2 G RC R W2 W L S2 S1 T1 T2

Remote Temperature Sensor (Optional)

An optional 8051 flush mount or 8053 surface mount remote temperature sensor can be attached to terminals T1 and T2. This sensor can be used to control a large space by averaging with the thermostat's internal sensor or overriding it, based on installer setup menu settings.

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.

Do not mount remote sensor:

• Behind doors, in corners, or other dead air spaces.
• In direct sunlight, near lighting fixtures, or other heat-generating appliances.
• 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.

Wiring Terminal Diagram Reference: RSB RSA I2 C I1 O/B Y Y2 G RC R W2 W L S2 S1 T1 T2

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 on the wall and mark hole locations.
4. Drill 1/4" holes and insert supplied anchors (for drywall).
5. Place mounting plate over anchors, insert and tighten screws.
6. Seal wire entry holes to prevent drafts affecting temperature readings.

Power & Reset Options

The thermostat is powered by 24VAC. It maintains the clock for 24 hours during power loss and has a memory backup for settings. The reset button (under the front cover) can reset the thermostat to factory defaults, including Installer System Settings.

[RESET BUTTON Icon]

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 excess wire back into the opening and plug the wall opening to prevent drafts.

Terminal Descriptions:

• 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).

Wiring Terminal Diagram Reference: RSB RSA I2 C I1 O/B Y Y2 G RC R W2 W L S2 S1 T1 T2

Wiring Diagrams

The following diagrams illustrate typical wiring configurations. Refer to individual equipment manuals for specific details.

Conventional Heat/Cool Wiring Diagrams

Single Transformer (Use Jumper Wire)

Diagram shows connections for 1st Cooling, 2nd Cooling, Fan, Cooling Transformer, 1st Heating, 2nd Heating, Heating Transformer, Remote Temp Sensor, Outdoor Temp Sensor, Not Used terminals.

Terminal Reference: RSB RSA I2 C I1 O/B Y Y2 G RC R W2 W L S2 S1 T1 T2

Two Transformers (Remove Jumper Wire)

Diagram shows connections for 1st Cooling, 2nd Cooling, Fan, Cooling Transformer, 1st Heating, 2nd Heating, Heating Transformer, Remote Temp Sensor, Outdoor Temp Sensor, Not Used terminals.

Terminal Reference: RSB RSA I2 C I1 O/B Y Y2 G RC R W2 W L S2 S1 T1 T2

Heat Pump Wiring Diagrams

Single Transformer (Use Jumper Wire)

Diagram shows connections for Reversing Valve, 1st Compressor, 2nd Compressor, Fan, Transformer, 2nd Aux Heating, 1st Aux Heating, Fault Detect, Outdoor Temp Sensor, Remote Temp Sensor, Not Used terminals.

Terminal Reference: RSB RSA I2 C I1 O/B Y Y2 G RC R W2 W L S2 S1 T1 T2

Two Transformers (Remove Jumper Wire)

Diagram shows connections for Reversing Valve, 1st Compressor, 2nd Compressor, Fan, Transformer, 2nd Aux Heating, 1st Aux Heating, Fault Detect, Outdoor Temp Sensor, Remote Temp Sensor, Not Used terminals.

Terminal Reference: RSB RSA I2 C I1 O/B Y Y2 G RC R W2 W L S2 S1 T1 T2

Indoor Air Quality Equipment Wiring Diagrams

Dehumidifier Wiring

Diagram shows connection for Dehumidifier Transformer and terminals RSB RSA I2 C I1 O/B Y Y2 G RC R W2 W L S2 S1 T1 T2.

Note: The I1/I2 output is a dry contact closure. The dehumidifier wiring diagram is for a normally open dry contact input.

Humidifier Wiring

Diagram shows connection for Humidifier Transformer and terminals RSB RSA I2 C I1 O/B Y Y2 G RC R W2 W L S2 S1 T1 T2.

Note: The humidifier wiring diagram assumes the control is powering a solenoid valve.

Ventilation Wiring

Diagram shows connection for Normally Closed Damper Transformer and terminals RSB RSA I2 C I1 O/B Y Y2 G RC R W2 W L S2 S1 T1 T2.

Note: The ventilation diagram assumes the control is for a normally closed damper.

Refer to individual humidifier, dehumidifier, or ventilation installation instructions for product-specific wiring details.

Support Module Wiring Diagram

Diagram shows connections for Model 8081 or 8082 Support Module with terminals RC, C, RSB, RSA, T1, T2, T3, T4.

Note: Up to four Support Modules can be wired to the thermostat. Use CAT-5 wire. Total wire length for all support modules should not exceed 1000 feet.

Terminal Reference: RSB RSA I2 C I1 O/B Y Y2 G RC R W2 W L S2 S1 T1 T2

Setup & Testing

Equipment Type Selection Switch (SW1)

This thermostat supports heat pump or heat/cool systems. Switch SW1, located on the back of the thermostat face, selects this option. This setting is displayed in the Installer System Settings under "Equipment Type".

SW1 positions: HEAT/COOL, HEAT PUMP.

Installer Setup Menu

How to Enter the Installer Setup Menu and Select Equipment to Setup:

1. Press [MODE] to set the system to OFF.
2. Press [MENU] to enter the main menu.
3. Press and hold [SETUP] for seven seconds until [INSTALL SETUP] appears.
4. Press [INSTALL SETUP] to enter the installer setup menu.

In the Installer Setup menu, you can select Thermostat or Indoor Air Quality (IAQ) setup. For IAQ setup, you can then choose to configure Air Cleaning, Humidification, Dehumidification, or Ventilation.

Use [NEXT] or [BACK] to navigate settings. Use [UP ARROW] or [DOWN ARROW] to adjust options. Press [MENU] to exit. Press [DONE] to save and exit, or [CANCEL] to exit without saving.

If IAQ setup is selected first, the Installer System Setting for Outdoor Sensor will be presented before entering IAQ setup.

To reset Installer System Settings to defaults, press the [RESET] button for 5 seconds.

Change System Settings

Press [NEXT] or [BACK] to page through settings. Press [UP ARROW] or [DOWN ARROW] to adjust the setting.

Thermostat Installer System Settings Table

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 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

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.

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.

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.

Refer to manuals for humidifier, dehumidifier, air cleaner, and ventilation products for recommended installation and operation.

Removal of Indoor Air Quality Control Buttons

If any Indoor Air Quality control features are not installed, the corresponding button can be removed using the following procedure:

1. Verify the specific Indoor Air Quality control feature is not installed in the Installer System Settings (see pages 11-14).
2. From the home screen (see page 20), press and hold the Indoor Air Quality button you wish to remove for 7 seconds.
3. The message center will display REMOVE BUTTON and the options of NO and YES (NO will be flashing).
4. Press [UP ARROW] or [DOWN ARROW] to select YES.
5. Press [DONE].
6. The button is now removed.

Once the button is removed, it can be brought back by installing the corresponding Indoor Air Quality feature (see pages 11-14).

System Test Menu

The system test menu is used to test a system after installation. The thermostat's outputs can be manually activated to test their function. The instructions below show how to enter the test mode and turn outputs on and off.

How to Enter the System Test Menu:

1. Press [MODE] to set the system to off.
2. Press and hold [FAN] and [MODE] for three seconds to enter system test mode.
3. The first screen of the installer test displays the equipment configuration.
4. Press [NEXT] to enter the first installation test or [CANCEL] to exit.

System Test Steps: Heating equipment test, Cooling equipment test, Fan equipment test, Humidification equipment test, Dehumidification equipment test, Ventilation equipment test.

System Test Menu (Continued)

Each equipment test begins with selecting the output or stage to turn on. Press [UP ARROW] or [DOWN ARROW] 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.

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.

System Test Tables

Heat / Cool Heating Equipment Test

Heat Pump Heating Equipment Test (Electric Heat)

Note: System Variable 03, O/B operation selects O or B.

Heat Pump Heating Equipment Test (Gas Heat)

Note: System Variable 03, O/B operation selects O or B.

Heat / Cool Cooling Equipment Test

Heat Pump Cooling Equipment Test

Note: System Variable 03, O/B operation selects O or B.

Fan Equipment Test

Humidification Equipment Test

Dehumidification Equipment Test

Ventilation Equipment Test

Quick Reference to Controls & Display

Home Screen

Displays:

• Room Temperature
• Current Day
• Outdoor Temperature
• Room Relative Humidity
• Temperature Setting
• Wi-Fi Signal Strength
• Heat Blast Button
• Main Menu Button
• Air Cleaning Button (Enters Event-Based™ Air Cleaning Control Screen)
• Humidity Control Button (Enters Humidity Control Screen)
• Fresh Air Button (Enters Ventilation Control Screen)
• Temperature Adjustment Indicators
• Heat Pump Only Emergency Heat or Auxiliary Heat (Red indicator)
• System Fault (Yellow indicator)
• Maintenance Reminder (Yellow flashing indicator)
• Hold Button (Sets or Clears Hold)
• Current Time & Date

Note: Backlight is activated with the first button press and automatically turns off.

Main Menu

Accessed via the [MAIN MENU] button. Options include:

• Set Schedule Button
• Clean Screen (Locks out touch screen for 30 seconds)
• Set Vacation Hold (Hold - To Time and Date)
• Set Current Time and Date
• Done Button (Exit Menu)
• Installer/User System Setting

Troubleshooting

Display is Blank

• Check circuit breaker and reset if necessary.
• Ensure power switch at the heating & cooling system is on.
• Make sure the furnace door is closed securely.

Temperature Settings Do Not Change

Ensure 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).

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 for the cause.
• Check for 24VAC between the heat terminal (W) and the transformer common. If 24VAC is present, the thermostat is functional; check the heating equipment.
• Check for loose or broken wires between the thermostat and the heating equipment.

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 for the cause.
• Check for 24VAC between the cooling terminal (Y) and the transformer common. If 24VAC is present, the thermostat is functional; check the cooling system.
• 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 ensure it matches the system type (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 ensure the reversing valve operation matches the heat pump.

Heat/Cool Both On at Same Time

• Check SW1 (Equipment Type) to ensure it matches the installed heating/cooling equipment (see page 8).
• Ensure heating and cooling wires are not shorted together.

Heating Equipment is Running in Cool Mode

• Check SW1 (Equipment Type) to ensure it matches 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

• 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.

Humidifier Does Not Operate in Auto Mode

• Check Installer System Setting number 15 (Outdoor Sensor) is set to Installed or Automation.
• Verify the outdoor sensor is functioning correctly or if set to Automation, that it has not timed out. If functioning correctly, the outdoor temperature will display in the outdoor temperature location (see Home Screen on page 20).

Troubleshooting Wi-Fi Connection

The Wi-Fi connection status is communicated via the radio strength indicator and the message center. The table below describes various statuses, messages, and radio bar displays.

Error Codes

If the thermostat enters an error mode, all outputs are turned off. The thermostat attempts to recover every 10 minutes.

Thermostat Features

• Remote access and control over Wi-Fi.
• Indoor air quality control: Humidification (automatic or manual), 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.

Specifications