Frequently Asked Questions

All installed equipment has the equipment status displayed at the top of the home screen and will display: “ON, OFF, IDLE.” 

The look and feel of the app will reflect the devices connected to it. If your app shows this, your connected devices are not yet able to support the new features.

In time, they will be automatically updated. Once that happens, your app will show you this.

In the event that multiple connected devices show different screens, this indicates that one or more have been automatically updated to use the new layout. The devices that are in line to be updated will continue to use the previous layout. You do not need to take any action at this time. Once all your devices have been upgraded, you will no longer be shown the previous screen layouts. This will happen automatically.

A. By wiring terminals/back plates:

8476W

8620W

8910W

8920W

B. Determine your thermostat's model number by removing the cover on the front.

8476W

8620W and 8910W

The model number will be located directly below the screen. If you have a full-color touch-screen thermostat, then you have the Model 8920W

Make sure that your router is operating correctly by checking other devices on your network to see if they are working.

If other devices are working properly, proceed to the router compatibility section of the FAQ.

Still having trouble? Try our Aire Care app! It is designed to help you get your thermostat connected by diagnosing and helping you resolve any issues your home's network might be experiencing.

Yes. Most standard routers can be set up to be a repeater, or you can purchase and install a Wi-Fi repeater.

Is your signal not strong enough? The Aire Care app can identify other solutions to help get you connected.

1. If you know your thermostat model number, follow the directions for Clearing the Router Setting in your owner’s manual, or find the directions below.

• 8476W
• 8620W
• 8910W
• 8920W

(All of the above links are the Clearing Router Settings sections of manuals.) If you do not know your thermostat model number, find it here.

2. Click on the "+" icon and follow the Add a Thermostat steps, but choose “Other Options” then “Assign Device to User Account.”

3. Enter the MAC ID of your device and press Continue.

4. Follow the remaining steps in the Quick Start Guide from #20 for iOS devices or step #19 for Android devices.

Pollen data is not always available for every zip code, every day.

All communication between your device and your thermostat is protected by industry standard TLS, 256-bit encryption.

We have made several changes. The base app has been updated for reliability and stability improvements. We have also redesigned the look and feel of the app for use with our next generation connected devices. Currently installed devices will receive automatic updates to allow them to take advantage of the newly design

ned app.

It is recommended that you connect this thermostat to your home network. If you wish to connect to a guest network, you many need to contact your router manufacturer for assistance.

No. You can enter the MAC ID with upper case letters following the correct format (Ex: B41122434E).

The MAC ID should populate on its own when connecting a new thermostat, if the device is added following the directions in the User Guide.

1. Search for AprilAire.
2. Change iPad Only to iPhone Only in the top navigation bar.
3. The AprilAire App will now appear.

If your Wi-Fi connection is restored and your router and its password are the same, your thermostat will automatically reconnect.

Is your thermostat still not connecting? Aire Care is here to help you reconnect your thermostat.

Remove your control from the previous network by following the “Clearing Router Settings” procedure in your owner’s manual.

If you do not have your owner’s manual, find it by choosing your model here and selecting “Manual” beneath the product image.

Select the Quick Start Guide for your smart device platform and follow the instructions in the “Connect your Wi-Fi Thermostat to Your Home Network” Section.

Is your thermostat still not connecting? Aire Care is here to help you reconnect your thermostat.

For problems with your HVAC equipment, call the contractor who installed your HVAC equipment, or find a Healthy Air Pro near you.

The AprilAire Healthy Air App runs on most, popular U.S. mobile devices that are running up-to-date operating systems, including:

All Apple iOS devices Version 6 and above.

Android OS 9.0 and above.

If you're experiencing Wi-Fi connection problems while using the AprilAire Healthy Air App, Aire Care can help.

By default, these thermostats are configured to work with most home automation systems. To work with the AprilAire app, the internal setting that controls this needs to be switched to AprilAire Cloud. Follow the steps to switch to AprilAire Cloud.

1. On an 8810, set the thermostat to Off mode. Next, press and hold the Mode and Up Arrow buttons for 3 seconds until the screen changes to 00. Look at the number in the upper, right-hand corner. Use the up or down arrow button to change this to 0. Press Mode repeatedly until the word Done appears. The thermostat is now able to be configured for use with the AprilAire App.
2. On an 8820 or 8830, set the thermostat to the Off mode. Next, press Menu once and then hold Setup for 7-10 seconds, until the message “Installer Setup Enabled” appears. Release the Setup button and then tap Install Setup once. Press the Next button once, and you should see option 00 appear. Press the Up or Down Arrow to change the setting to AprilAire Cloud, then press Done twice. The thermostat is now able to be configured for use with the AprilAire App.
3. On an 8840, press Menu and then hold Contractor Info for 10 seconds. When the message “Enter installer settings?” appears, tap Yes. The thermostat will reboot in the configuration mode. Select General and change the first setting to AprilAire Cloud. Press Next until Done appears, then press Done twice. When the message “Are you sure you want to exit the Installer Settings?” appears, press Yes. The thermostat will reboot and will be able to be configured for use with the AprilAire App.

Yes, once your router comes back online, your thermostat will connect to the router.

Is your thermostat still not connecting? Aire Care is here to help you reconnect your thermostat.

The password is usually set when the router is setup by a homeowner or internet service provider. If you do not know the password, check the bottom of the router, the router owner’s manual or any service papers from the install process. If you cannot locate the password, you will need to contact your router manufacturer. AprilAire does not have this information.

1. Open the AprilAire App and go to the Location to which you will assign the new thermostat.
2. Follow the steps for deleting a thermostat on your Android or iOS device.
   • Click on the + icon and follow the Add a Thermostat steps, but choose “Other Options” then “Assign Device to User Account.”
   • Enter the MAC ID of your device and press Continue.
   • Follow the remaining steps in the Quick Start Guide from #20 for iOS devices or step #19 for Android devices.

1. Identify the model number of the thermostat:

"If you know your thermostat model number, follow the directions for Clearing the Router Setting in your owner’s manual, or find the directions below.

8476W

8620W

8910W

8920W

If you do not know your thermostat model number, find it here.  

2. Clear any old router settings.

3. Follow the quick start guide, to connect your thermostat to your router.

4. Before assigning it to your user account, follow the steps in the owner’s manual to unregister the thermostat. This will remove it from any previously-assigned user account. Assign the thermostat to your user account.

Is your thermostat still not connecting? Aire Care is here to help you reconnect your thermostat.

If you know your thermostat model number, follow the directions for Clearing the Router Setting in your owner’s manual, or find the directions below.

8476W

8620W

8910W

8920W

If you do not know your thermostat model number, find it here. 

Select the Quick Start Guide for your device and follow the instructions in the "Connect your Wi-Fi Thermostat to Your Home Network" section. 

Is your thermostat still not connecting? Aire Care is here to help you reconnect your thermostat.

The thermostat is only compatible with 2.4Ghz Wi-Fi networks.

Not sure what security standards your route is using? Aire Care can help by telling you if your router's settings are compatible.

Please view the Quick Start Guide for connection instructions. This guide can also be found in the packaging for your thermostat.

Is your thermostat still not connecting? Aire Care is here to help you reconnect your thermostat.

If your app shows this, your devices are still accessible through the web app. Log in HERE.

If your app shows this, your device is no longer accessible through the web app. The new layout is only available through the app.

An AprilAire air filter is an integral part of your HVAC system. They trap dust and other airborne pollutants that flow through your ducts, which can make you sick or clog your HVAC system leading to expensive repairs.

Over time, the filter gets clogged and becomes less efficient at trapping harmful pollutants like airborne viruses. It is important to replace your air filter to keep your system running efficiently.

Here are some tips to follow for the disposal of air filters.

1. Turn your HVAC system off

Turn your system off before removing your old filter. Do not run your HVAC system without a new air filter in here.

2. Have a plastic bag ready

Your air filter is full of dust, debris, and other contaminants that you do not want to end up back in the air or on your ground. Having a bag ready to go will help make this transition less precarious. In addition, do not bump or shake your air filter when placing it in the bag.

3. Tape the bag shut

To prevent any drops or spills once the filter is in the bag, carefully tape it shut to seal.

4. Place the filter in an outdoor trash can

Keeping your old filter in an indoor trash can could lead to the bag reopening and the dirt and debris in the filter escaping back into your air. Placing it in an outdoor trash can will help remedy this.

5. Replace filter

Place your replacement AprilAire filter in the HVAC system and then turn the system back on once the new filter is inserted.

6. Stock up on a replacement filter

Order a new AprilAire Air Filter today to make replacing your old filter simple and easy.

For more information and tips about AprilAire Air Filters and air purifiers, read our FAQs article.

Ensure that your thermostat is in Wi-Fi setup mode. In Wi-Fi setup mode, the Wi-Fi logo on the thermostat will be strobing. If the Wi-Fi logo is strobing, follow the instructions in the Quick Start Guide.

If your Wi-Fi thermostat is not in setup mode, refer to the thermostat owner’s manual for directions to enable it. Note: It may take up to 30 seconds for the thermostat to enter Wi-Fi setup mode after powering up or after a reset.

We send email notifications to users when automatic updates have been completed on their devices. If you enabled receiving updates via email, you will be notified when your device has been updated. Along with the newest version to the app, your device's connectivity and reliability will improve.

• WPA2 (AES)
• WPA/WPA2 Mixed Mode (AES and TKIP)
• WPA (TKIP)
• WEP (64/128bit - otherwise recognized by 10/26 hexadecimal characters)
• Open

WPA2 Enterprise is not supported.

What if my router is secured using WEP?

If you have a router that uses the older WEP standard, you will not be able to connect the thermostat to your home Wi-Fi using your phone. However, you can still setup the thermostat using a computer. Follow these instructions:

1. Confirm the Wi-Fi symbol on the thermostat is “strobing.”
2. On your laptop, open Wireless Settings and connect to the Wi-Fi network that matches the SSID that is displayed on your thermostat (Example: AprilAire8620W000492)
3. Type this address into your browser address bar: http://192.168.1.99/index.html
4. A pop-up may appear asking for your login and password. Enter admin for both.
5. Select your home’s router and enter the router’s password.
6. Once the Wi-Fi connection setup is complete, you will be able to access the Wi-Fi Thermostat from your phone.
7. If the thermostat is already added to your account, you will be able to connect. If not, follow the instructions for adding a thermostat in the User Guide.
   

Not sure what security standards your router is using? Aire Care can help by telling you if your router's settings are compatible.

The AprilAire Wi-Fi Thermostat uses an 802.11b/g/n 2.4 GHz Wi-Fi alliance certified radio and is compatible with most residential 2.4 GHz Wi-Fi networks.  802.11ac networks are not supported unless they are dual band capable.

Dual Band Routers:

AprilAire Wi-Fi Thermostats can be used with dual band access points or routers. Dual band access points or routers broadcast two (or more) wireless networks (SSIDs); one (or more) in the 2.4GHz band and one (or more) in the 5GHz band.  The AprilAire Wi-Fi Thermostat is only able to connect to wireless networks operating in the 2.4GHz band (802.11 b/g/n radio). Please configure your dual band router to have two different SSID: one for the 2.4 GHz and one for 5GHz.  Connect the thermostat to the 2.4GHz SSID.

Verify that your router is compatible by running a scan of your network with Aire Care.

To remove a thermostat from your account, you must unregister or delete it from your account. You do not need to have access to the thermostat.

Follow the steps for deleting a thermostat. Scroll down to Settings and click the arrow for Add/Remove Thermostats. 

You need at least 2 bars for reliable Wi-Fi connection between your device and thermostat. If you are unable to maintain this signal strength, try moving your router closer to your thermostat or disconnecting  other devices that operate on 2.4GHz.

These include:

• Baby monitors
• Microwaves
• Cordless phones
• Bluetooth devices
• Other wireless devices

Is your signal not strong enough? The Aire Care app can identify other solutions to help get you connected.

The look and feel of the app will reflect the devices connected to it.

If your app shows this, your connected devices are not yet able to support the new features.

In time, they will be automatically updated. Once that happens, your app will show you the new screen.

Yes, the thermostat will operate the heating and/or cooling system with or without Wi-Fi. Losing your Wi-Fi connection will not prevent the thermostat from running schedules – it will just prevent control of the thermostat from a mobile device until the connection is restored.

Check out this section with other FAQs curated by our expert support team. 

Download the AprilAire AireCare app to help you troubleshoot any internet issues you may encounter at home. If you are still having issues connecting to your device after using the AireCare app's diagnostic features, please call us at (800) 334-6011.

• Open the device’s Settings page in the app and open Device Sharing.
• The user who provisioned the device is set as the device Manager.
• Click on the (+) to add the email address of another user's account. The other user must have already set up their user account for this step to succeed.
• Set the level of access being granted to the new user.
• Press Save when finished

AprilAire collects and stores your username, password and zip code. Your address may also be stored if you choose to provide it.

We may also collect data about how you use your HVAC system, including temperature, schedule, humidity and ventilation settings. All collected data is encrypted (Bcrypt algorithm) and will not be shared with any third parties.

Data collected may be used to help improve our products and service.

Data collected may be used to help improve our products and service. Data will not be shared with third parties.

Since every home is different, the number of zones in a home is typically determined by the floor plan and design of the home.

Most homes are divided into 2 or 3 zones. Homes with more than one level may set up each level as a zone. Heating and cooling patterns vary from room to room throughout the day. This will determine which rooms should be combined based on maintaining the same temperature throughout the zone.

Lifestyles which relates to when a room or rooms are occupied can determine which rooms should be combined into a zone. Rooms only used for entertaining may be on a separate zone from rooms used on a regular basis.

If the zone thermostat is set to operate the heating and cooling system fan constantly, the system fan will continue to run at the end of a heating or cooling call.

The AprilAire zoned comfort control system also has the ability to expel any remaining conditioned air into the living space at the end of the call by operating the heating and cooling system fan.

This process is referred to as fan purge and typically last 1–2 minutes. Often times the heating and cooling system has a fan purge option as well. If using the system fan purge the AprilAire zoned comfort control system fan purge may be turned off.

Your HVAC installer will know how to do this.

The AprilAire zoned comfort control system consists of a control panel, thermostats and dampers installed in conjunction with your existing heating and cooling forced air system.

Thermostats connected to the AprilAire zoned comfort control panel call for conditioned air whenever the temperature in the zone(s) is not at the desired set point. The AprilAire zoned comfort control panel sends the call on to the heating and cooling equipment. Zone dampers, located in the forced air heating and cooling system, for zones which are not calling for conditioned air, are powered closed by the AprilAire zoned comfort control panel. The heating and cooling system then distributes the conditioned air through the duct work to the calling zones.

An ERV can be interfaced with any forced air HVAC system.

It can also be used as an independent ventilation system in homes without a forced air HVAC system. The HVAC installer will know the best method of installation for each application.

• The 1000 series (models 1210, 1310 and 1410) includes a MERV 11 filter.
• The 2000 series (models 2210, 2310 and 2410) includes a MERV 13
• The 2000 series (models 2216, 2416 and 2516) include a MERV 16 filter. 

Related: AprilAire Whole-House Air Purifiers

The Model 8476 is a thermostat which in addition to controlling the temperature will operate the HVAC system fan for a specific schedule. The schedule options are: On -24/7, Circ (circulate), Event/3 hour, Allergy/24 hour and Auto.

Fresh air is constantly brought into the home by the AprilAire Model 8100 ERV system and a like amount of stale indoor air is exhausted at the same time; in other words, the same amount of air is being exchanged.

However, the hot or cold energy (depending on the season) is extracted from the indoor air before it’s exhausted and transferred to the incoming air, so that there is little energy lost.

In order for microbial growth to occur three conditions must exist: There must be an organic food source for the microbes, the temperature must be in a certain range (different molds grow at different temperatures), and water must be present for an extended period of time. 

These conditions can exist in some types of humidifiers, but AprilAire evaporative humidifiers are designed to prevent microbial growth.  None of the materials in AprilAire Humidifiers provide a food source. 

Even the paper Water Panel in Model 400 is treated with an anti-microbial agent. Most significantly however, the drain-through technology in AprilAire evaporative humidifiers leaves no standing water once the humidifier turns off.  All the water delivered to an AprilAire evaporative humidifier is either evaporated or goes down the drain, leaving all surfaces dry between humidification cycles.

AprilAire Humidifiers carry a 5-year limited warranty. See the owner’s manual for details and complete the warranty registration for your AprilAire Humidifier.

Your AprilAire Humidifier should operate anytime the HVAC system is running and the indoor relative humidity level is lower than the set point on your humidistat.

For example, If the humidity in your home is 45% or higher, your AprilAire Humidifier will not run since that is the highest set point on our humidistats. 

Once the humidity level in your home drops below 45%, the humidifier will resume operations. 

If not, we recommend contacting your installing contractor to troubleshoot the humidifier at your home.

AprilAire Humidifiers take water from a liquid and turn it into a water vapor. The water vapor is added whenever the humidity level in the home is lower than the desired level and the HVAC system fan is moving air.

AprilAire Humidifier’s are designed to maintain a relative humidity level of 35% anytime the outside temperature is 20F or above at an indoor temperature of 70F. If your HVAC heating system has a short run time for a heat call, this will result in a short run time for the humidifier and may result in the humidifier not reaching the desired humidity set point. Whenever there is a need to add humidity to your home, the humidifier control will send a signal to the humidifier to operate.

Water is introduced into the humidifier and flows over the Water Panel® evaporator. The air moving through the HVAC system moves through the Water Panel® evaporator absorbing the moisture into the air. The vapor is then distributed to your home, through the duct work by the blower of the HVAC system. The humidifying process continues until the humidification set point is reached or the HVAC system stops operating. Water not used in the evaporation process is used to flush away mineral deposits left behind from the evaporation process down the drain.

The only models where deposits are not flushed down the drain are the  400/400M models, since they are drain-free humidifiers. Most AprilAire evaporative humidifiers are wired by the HVAC installer to only operate when the heat is operating. If the humidifier is supplied with hot water, the humidifier can be wired to operate on an HVAC fan call. The fan call is initiated by the thermostat which includes a switch to run the HVAC system fan continuously. This fan call can be turned off once the desired humidification level has been reached.

AprilAire, like any other humidifier manufacturer, designs our humidifiers to maintain an indoor relative humidity of 35% at an indoor temperature of 70F, anytime the outdoor temperature is 20F or above.

Some homes may be able to attain a higher indoor humidity. However, factors such as the age, cubic footage (square footage times ceiling height), tightness of the home, as well as the operating time of the HVAC heating system, will affect the actual level achieved.

Humidifiers require heat, water and air movement in order to add moisture to the air. Moisture in the form of vapor is added whenever the humidity level in the home is lower than the desired level and the HVAC system fan is moving air. If your HVAC system has a short run time for a heat call, this will result in a short run time for the humidifier and may result in not reaching the desired humidity set point.

AprilAire Humidifiers are designed to accurately control the level of humidity in the home. This is accomplished by the use of an outdoor temperature sensor that continuously communicates with a computer equipped control. In conjunction with a precision humidity sensor which samples the air coming back to your furnace, the AprilAire Automatic Digital Humidifier Control responds immediately to changing outdoor conditions.

Remember, it’s just as important to shut the humidifier down when the humidity control reaches its set point as it is to deliver even more comforting humidity to the home when it’s warmer outside. The Models 300, 400, 500, 600, and 700 come with this automatic digital humidifier control which allows the humidifier to deliver the optimum amount of humidity based on the current outdoor conditions.

This will typically range from 20% on a really cold day to as much as 45% when it’s warmer outside. This is of importance because industry data shows that mold does not grow in humidity levels below 60%. The bottom line is no AprilAire Humidifier will contribute to the growth of mold, when installed, operated, and maintained as recommended.

Cold air outside your window cools the air just inside your window more than the air in the rest of the room. If the well-humidified air just inside the window cools too much or too quickly, it can’t hold as much moisture as before and water appears on the window.

To eliminate this, follow the suggested settings on your manual humidistat and adjust the setting in the morning for the anticipated night time low temperature.

Another option is to upgrade your manual humidistat to an automatic digital humidifier control (model 60), which always maintains proper level of humidity with minimal or no adjustment required by the homeowner.

To obtain a model 60, please contact your heating and cooling contractor. If you need the name of a local dealer, please use the Find A Pro locator on our website.

AprilAire Humidifiers are an evaporative-style humidifier. Unlike misting or atomizing humidifiers which put water droplets into the air stream, AprilAire Humidifiers use a natural evaporation process to generate humidity.

The humidity created is a gas, which simply passes through any component in the heating and cooling system or any air cleaner including an AprilAire Air Cleaner with no adverse effects. The humidity created by your AprilAire Humidifier is no different than the humidity present in your home during the summer months.

No. AprilAire products are sold through licensed heating and cooling contractors as they are best suited to help you choose the right unit, install it correctly and handle any warranty situations in the unlikely event one would occur.

If you need the name of a Healthy Air Pro, please use the Dealer Locator on our website.

AprilAire feels it is important to offer a humidifier control option for all applications. 

An outdoor temperature sensor continuously reports changes in the outdoor temperature to the automatic digital humidifier control located on the cold air return duct.

The automatic digital humidifier control uses this information to determine if the home requires additional humidity, to ensure the optimum humidification level is maintained.

However, we realize there are some applications where it is impractical or impossible to run an outdoor temperature sensor to the outside. This is why we provide a high quality manual humidifier control for such applications. The automatic digital humidifier control also includes the option of operating in manual mode.

Manual operation requires the homeowner to manually adjust the humidity level on the humidifier control as the outdoor temperature changes. Having these options allows flexibility to meet every customer’s humidification needs.

No. The outdoor temperature sensor is what allows your AprilAire Humidifier to be an automatic humidifier.

If the automatic digital humidifier control is installed and is operating in the automatic mode (as referenced by the faceplate on the automatic digital humidifier control), the outdoor sensor is required for proper operation. The outdoor temperature sensor continuously reports changes in the outdoor temperature to the automatic digital humidifier control located on the cold air return duct. The automatic digital humidifier control uses this information to determine if the home requires additional humidity, to ensure the optimum humidification level is maintained.

Any AprilAire furnace mount humidifier can be upgraded to an automatic humidifier by installing an AprilAire automatic digital humidifier control with the outdoor temperature sensor. It is the control which upgrades the humidifier to an automatic humidifier.

The model number for the control to use with our AprilAire evaporative humidifiers is the model 60. The model number for the control to use with our AprilAire steam humidifier (model 800 and model 865)  is the model 62. The outdoor temperature sensor continuously reports changes in the outdoor temperature to the automatic digital humidifier control located on the cold air return duct.

The automatic digital humidifier control uses this information to determine if the home requires additional humidity, to ensure the optimum humidification level is maintained. You will receive up to 50% more humidity compared to a manual humidistat which will increase your home’s comfort.

Your Healthy Air Pro can install this component so you can enjoy fully automatic operation—just set it and forget it!

There frequently are several different AprilAire models which will adequately humidify your home.

The most qualified person to help you decide which AprilAire Humidifier model will best fit your needs is your local Healthy Air Pro found on the Find A Pro Dealer Locator. They can recommend and install the best AprilAire Humidifier for your home based on its size, age and construction.

There are several AprilAire Humidifiers which will effectively humidify a home. Factors to consider are the age, cubic footage (square footage times ceiling height) and tightness of the home, as well as the operating time and size of the duct work of the HVAC heating system. Humidifiers require heat, water and air movement in order to add moisture to the air.

Moisture in the form of vapor is added whenever the humidity level in the home is lower than the desired level and the HVAC system fan is moving air. If your HVAC system has a short run time for a heat call, this will result in a short run time for the humidifier and may result in not reaching the desired humidity set point. While your heating and cooling contractor is the best one to determine which of our models would be best for your home, the chart below is a guideline for how many gallons per day a home requires.

There frequently are several different models which will adequately humidify a home. Typically dealers will install an AprilAire humidifier they are comfortable with, have recommended to their customers for some time, and meet the technical requirements for humidification in your home.

Bottom line, choose the dealer you are comfortable with; they know your heating and cooling system and can recommend an appropriate AprilAire Humidifier.

Periodically, we add features or refine some aspects of our AprilAire Humidifiers. When this happens, we modify the model number or introduce a new model number. Models not listed in the main product sections on this site, but still offered by dealers, have very likely been recently discontinued.

These are still modern, high-performing AprilAire Humidifiers which will effectively humidify a home. Your Healthy Air Pro is the expert in recommending the best model AprilAire Humidifier for your home and its unique needs. 

Listed below is a description of current AprilAire Humidifier models and the models they replaced.

• Model Number: 300
  Can be used in homes with Mini-Splits, Boilers, Radiant Heat & Other Ductless Systems, as well as homes with ducted forced air furnaces. 
  Previous Model: 350/360
• Model Number: 400/400M 
  This bypass humidifier features drain-free operation. The water panel evaporator is wetted by the standard flow-through system but then wicks excess water up from a small reservoir. Operation can be either manual or automatic.
  Previous Model: Recirculating Models 445 (manual control) & 445A, 448 (automatic control)
• Model Number: 500/500M 
  This small bypass model incorporates a built-in bypass damper and easy right or left discharge change-over. Control can be automatic or manual.
  Previous Model: Bypass Models 550 (manual control) & 550A, 558 and 500A (automatic control)
• Model Number: 600/600M 
  This large bypass model incorporates a built-in bypass damper and easy right or left discharge change-over. Control can be automatic or manual.
  Previous Model: Bypass Models 220, 224, 440, 560 (manual control) & 560A, 568 and 600A(automatic control)
• Model Number: 700/700M 
  This large capacity powered model can be operated in manual or automatic mode.
  Previous Model: Powered Models 110, 112, 760 (manual control) & 760A, 768 and 700A (automatic control)
  
• Model Number: 800 
  This steam humidifier is designed for applications such as crawlspaces, attics, areas of the country with milder winters with non-forced air heating.
  Previous Model: N/A
• Model Number: 865

AprilAire bypass humidifier’s get their air movement through the water panel by the differential pressure between the supply (hot air) plenum and the return (cold air) duct.

The supply plenum is under positive pressure and the return duct is under negative pressure. One of the advantages of a bypass humidifier is that it can be installed either on the supply plenum or on the return duct with equal effectiveness. No matter which duct the humidifier is mounted on, the airflow always goes from the supply to the return through the humidifier.

A bypass humidifier will also have no adverse effect on any component in the furnace, air cleaner or filter. AprilAire Humidifiers put “water vapor” into the air. This is nature’s way of getting relative humidity into the air.

AprilAire power humidifiers are design to be installed on the hot air supply plenum. If however, there is no space available due to the HVAC air conditioning coil or the layout of the mechanical room, the AprilAire power humidifier can be installed on the cold air return duct.

When installed on the cold air return duct the humidifier must be supplied with hot water as the temperature of the air in the cold air return duct is not sufficient for proper evaporation.

The vents in the cover of the AprilAire power humidifiers are to keep the fan motor from overheating.

The air used in the humidification process is drawn into the humidifier from the HVAC system through the water panel and the humidified air is discharged back into the HVAC system.

During this process some of the air may discharge through the vents, however it will not affect the operation of the HVAC system. Similarly during the cooling season some air may discharge through the vents. This also will not have an adverse effect on the operation of the HVAC system.

All AprilAire Humidifiers require heat, water and air movement in order to add moisture to the air. Moisture in the form of vapor is added whenever the humidity level in the home is lower than the desired level and the HVAC system fan is moving air. If your HVAC system has a short run time for a heat call, this will result in a short run time for the humidifier and may result in not reaching the desired humidity set point.

Provided your AprilAire Humidifier is supplied with hot water (approximately 140F), and the HVAC system fan is operating, humidity will be added to your home. Your HVAC installer can wire your AprilAire Humidifier to operate on a HVAC system fan call as well as a heat call.

The Model 400 and 400M AprilAire Humidifiers can be installed on heat pump systems. However, since heat pumps deliver lower temperature air to the home than gas furnaces, evaporation will be approximately 60% of our rated capacity.

Due to the nature of the wicking water panel used in the Model 400, hot water provides limited benefit. As such, your HVAC installer will need to take the size, construction and age of your home into consideration to ensure the Model 400 will provide satisfactory comfort and protection through adequate humidification during a heat call from your heat pump system.

To ensure peak performance the Water Panel® should be replaced twice a season. Over time, the wicking capabilities (ability to draw water up the Water Panel) are reduced as minerals build up on the panel.

The mid-season change means you will receive proper humidity throughout the humidification season.

The simple maintenance of replacing the Water Panel® and cleaning the scale control insert, floats and float chambers can be completed in less than 10 minutes.

For proper operation, this is required twice during the humidifying season, typically every 3 months.

The AprilAire Model 400 is a drainless humidifier which uses a technology designed to use 100% of the water entering the unit.

This means there is not a continuous flow of water through the humidifier as there is with our other AprilAire Humidifiers such as the Models 300, 500, 600 and 700.

Instead there is a safety overflow connection at the base of the humidifier for an overflow drain line to connect to.

In the unlikely event of the water level sensor assembly circuit failing, water will be safely directed to a drain provided there is an overflow drain line attached.

The Model 350 and 360 AprilAire Humidifiers are completely self-contained and designed for installation in homes with electric baseboard heat, hydronic heat and even with homes with forced air heating systems with special humidification needs. These humidifiers require hot water, electricity and access to a drain. The Model 350 is designed to be hung from the floor joists in a basement.

Ductwork is connected from the humidifier to a floor vent in a central location of the home. The humidified air is then distributed to the home through this ductwork. The Model 360 is our through-the-wall humidifier and can be placed in a central location of the home in a closet or laundry room where electricity, water and a drain are available. Humidified air is distributed through a grille on the humidifier into a hallway where the vapor will migrate throughout the home.

The AprilAire Water Panels® are designed to be used for the humidifier season and replaced.

• The model 400 and 400M models require replacing the water panel every 3 months during the humidifier season.
• Models 300, 500, 500M, 600, 600M, 700 and 700M require replacement every humidifier season.

In some applications the water panels may require additional replacement.

Reduced humidification levels can occur if the water panel is not replaced as described above. This is because some of the minerals left behind from the evaporation process are permanently trapped in the water panel. The water panel will eventually become clogged with these minerals so less evaporation takes place. The result is less humidification.

The orientation of your AprilAire Water Panel® is important for maximum evaporation.

Most Genuine AprilAire Replacement Water Panels® (stock numbers 10, 12 and 35) you purchase will have a paint dot or stripe on one of the short ends. This paint should be placed up, towards the water distribution tray, for proper operation. The exception is if the stock number 35 is being replaced in the models 350 or 360. In these models there is no specific orientation of the water panel.

If your humidifier requires the #45 Water Panel AprilAire Humidifier model’s 400 & 400M), there will be no paint dot and the panel can be installed in either orientation.

AprilAire evaporative humidifiers can operate with hot, cold, hard or soft water.

Hot water is preferred as it supplements the heat from the HVAC system heat call to increase the evaporation rate. When the humidifier is wired to operate on a heat or HVAC fan call, hot water is required as it is the only heat source for the evaporation process.

The model 800 AprilAire steam humidifier requires cold water, which may be hard or soft. Hot water cannot be used because the supply water is used to cool the water going to drain.

All AprilAire Humidifiers include a water-metering orifice designed to regulate the water flow through the humidifier.

• The water flow rate for the models 500, 500M, 600 and 600M is 3 gallons per hour (GPH).
• The water flow to the models 300, 350, 360, 700 and 700M is 6 GPH.
• The water flow for the models 400, 400M is .7 GPH.

The saddle valve is not designed to regulate the water flow and should simply be turned to fully open (all the way to the left) so the orifice can regulate the flow. If the saddle valve is not fully open the humidity output from the humidifier will be reduced.

All AprilAire Humidifiers require heat, water and air movement in order to add moisture to the air. Moisture in the form of vapor is added whenever the humidity level in the home is lower than the desired level and the HVAC system fan is moving air.

Since the HVAC system is not operating, the AprilAire Humidifier may not be wired to only operate when the HVAC system fan is moving air. The water solenoid valve may also be in need of replacement.

Your HVAC installer can verify the wiring and operation of the water solenoid valve.

AprilAire evaporative humidifiers include a water panel, from which water evaporates into the air to produce moisture in the form of vapor. When water evaporates, minerals left behind from the evaporation process are flushed down the drain.

Minerals not flushed are permanently trapped in the water panel. If not changed, the water panel will eventually become clogged with these minerals. If this occurs, water being fed into the humidifier may leak due to the water panel being clogged.

Other factors which will cause water to leak are:

• The humidifier not being level and plumb (front to back)
• The drain line being clogged (drain line should be inspected for clogs yearly)
• The scale control insert (component water panel slides into) having a crack in it or not inserted into the base of the humidifier correctly
• The orifice which regulates water to the humidifier from the water solenoid valve may have become enlarged or is missing (resulting in a larger flow of water to the humidifier)
• The feed tube (component which carries water to the water panel) may have a crack in it or not be properly positioned in the distribution tray (component connected across the top of the water panel)

A replacement component for any component found to not be performing properly can be obtained through the HVAC installer.

If the water solenoid valve does not make a clicking sound when the humidity level is increased while the HVAC system fan is operating, the solenoid valve may require replacement by the HVAC installer.

The water solenoid valve may be tested by the HVAC installer by applying 24 volts to the water solenoid valve leeds.

AprilAire Humidifiers require heat, water and air movement in order to add moisture to the air. Moisture in the form of vapor is added whenever the humidity level in the home is lower than the desired level and the HVAC system fan is moving air. Provided there is a need for humidification and the HVAC fan is moving air, water should be draining from the humidifier (models 400 & 400M are drainless so no water will be draining during operation). If the water solenoid valve does not making a click sound when the humidity level is increased this would indicate the solenoid valve may require replacement by the HVAC installer. If the water solenoid valve does make a click sound when the humidity level is increased but no water flows this indicates the water flow is obstructed.

To determine if water flow is being obstructed, turn the control knob of the humidifier control to the off position or the lowest setting. The first location to check for an obstruction would be at the saddle valve located on the water line supplying water to the humidifier. When checking the saddle valve, make sure it is completely open. This can be done by turning the valve all the way to the left. If anything is clogged, it can be dislodged by turning the saddle valve all the way to the right and back to the left. Once this is done, turn the humidifier control dial above the click point and water should be coming out the drain line.

If water is still not coming out of the drain, check the orifice and in-line strainer to make sure they are not clogged. The orifice is located in the tube on the outlet side of the solenoid valve and the in-line strainer is located on the inlet side of the solenoid valve (see figure below). The orifice may be cleared by inserting a needle through the small opening. The strainer may be cleaned by running it under warm water to dislodge deposits or replace it. After clearing and re-installing the orifice and strainer (be sure to double wrench all water connections), turn the humidifier control dial above the click point and water should be coming out the drain line.

AprilAire Humidifiers are designed to efficiently use water for the evaporation process.

The feed rates for each humidifier model is below:

• Model: 400/400M, Feed Rate: 0.7 gallons per hour
• Model: 500/500M, Feed Rate: 3 gallons per hour
• Model: 600/600M, Feed Rate: 3 gallons per hour
• Model: 700/700M, Feed Rate: 6 gallons per hour

These feed rates will not activate tankless water heater since tankless water heaters typically require a certain gallons per minute to activate.

AprilAire recommends a conventional water heater with the ability to handle the household requirement for hot water with the feed rate for the AprilAire model factored in. 

AprilAire Humidifiers are packaged with one of two types of humidifier controls, a manual non digital humidifier control and an automatic digital humidifier control.

The models with an M in the model number (400M, 500M, 600M, 700M) and the models 350 and 360 include the manual humidistat (see below). For the models 400M, 500M, 600M and 700M, the manual humidistat can be installed in the cold air return duct or the living area. For the model 350 or 360 the manual humidistat must be installed in the living area.

The models 400, 500, 600, 700 and 800 include the automatic digital humidifier control, which is designed to only be installed on the cold air return duct of the HVAC system. It cannot be installed on a wall in the living area as airflow will not adequately get to the humidity sensor on the control. This results in inaccurate humidity levels.  

The AprilAire digital humidifier control can operate in automatic or manual mode, but regardless of the mode, the digital control requires the HVAC system fan to be operating, a water supply, and a heat source in order to create humidity.

Whenever the HVAC system is moving air (a heat call or a fan call) the digital humidifier control will add humidity if the humidification level is below the desired level.

If the digital humidifier control is wired to operate the humidifier during an HVAC fan call, the humidifier will need to be supplied with hot water as that is the only heat source available. A fan call simply circulates room temperature air in the home, typically 70F, which is not adequate to cause evaporation. In the automatic mode an outdoor sensor is installed. This sensor continuously reports changes in the outdoor temperature to the digital humidifier control located in the cold air return duct or outside the home. The digital humidifier control uses this information to determine if the home requires additional humidity, to ensure the optimum humidification level is maintained. In manual mode there is no outdoor sensor. As a result the digital humidifier control will require regular manual adjusting as the outdoor temperature changes, so the home is not over or under humidified.

The AprilAire digital humidifier control includes three indicator lights.

A flashing red light (the call dealer for service indicator) means the control is not operating properly and the installer needs to check the operation of the control. Anytime the red light is flashing a code will be displayed on the LCD screen.

There are four error codes:

1. E1, Relative humidity sensor failure
2. E2, Control knob failure
3. E3, Outdoor temperature sensor/manual mode sensor not recognized
4. E4, Communications with model 8570 AprilAire Thermostat not detected.

The code may be cleared by rotating the control knob on the humidifier control to the test reset position. The green Humidifier on” light will begin to flash after approximately 5 seconds. Return the control knob to its previous position.

If the error code has cleared the humidifier control has returned to normal operation. If not, the HVAC installer will need to review the wiring to determine if the control requires replacement.

The AprilAire digital humidifier control includes three indicator lights. A flashing yellow light (the change water panel indicator) means it is time to change the water panel in your AprilAire Humidifier.

Once the water panel has been changed, you will need to reset the change water panel indicator as it is not intuitive and has no way of knowing when the water panel was changed.

To reset the change water panel indicator:

1. Simply rotate the control knob on the humidifier control to the test reset position.
2. The green Humidifier on” light will begin to flash after approximately 5 seconds.
3. The water panel change indicator has been reset.
4. Return the control knob to its previous position.

The AprilAire digital humidifier control includes three indicator lights. A flashing yellow light (the change water panel indicator) means it is time to change the water panel in your AprilAire Humidifier. Once the water panel has been changed, you will need to reset the change water panel indicator as it is not intuitive and has no way of knowing when the water panel was changed.

To reset the change water panel indicator, simply rotate the control knob on the humidifier control to the test reset position. The green Humidifier on” light will begin to flash after approximately 5 seconds. The water panel change indicator has been reset. Return the control knob to its previous position.

The AprilAire digital humidifier control includes three indicator lights.

• A flashing green light (the humidifier on indicator) means the humidifier is operating in the test mode. Test mode is used to verify the humidifier is wired properly and lasts for one minute.
• The blue LCD light and the green humidifier on light will continue to flash at the end of test mode. This is an alert because if left in the test mode the humidifier will not operate. Return the control knob to its previous position so the digital humidifier control will operate your AprilAire Humidifier normally.
• During normal operation the green light will be on solid during any humidifier call.

The AprilAire manual humidistat is designed to be installed on the cold air return duct or on an interior wall in the living area of the home.

To determine the relative humidity in the home, slowly turn the knob on the control clockwise and counterclockwise and listen for 2 clicks. The actual relative humidity in the home is between the 2 clicks. It is important to anticipate a drop in outdoor temperature and reduce the humidity setting in order to avoid excess condensation.

The excess condensation occurs because the indoor relative humidity is higher than what the home can support for the current outdoor temperature. To adjust the humidity setting, simply rotate the control knob to the desired setting.

Provided the HVAC system fan is operating and the humidification level is lower than the new set point, the manual humidistat will activate the humidifier.

All AprilAire Humidifiers include a control which is either located on the cold air return duct or in the living area of the home. Below are a few of the controls we have offered since our humidifiers were introduced in 1954. The humidifier controls which have an off position should be placed in the off position. If the humidifier control does not have an off position simply turn the dial to the lowest setting and follow the applicable steps below. The summer/winter knob on the HVAC duct work is the bypass damper.

Annual summer shutdown for bypass models 400 series, 500 series and 600 series close the bypass damper, which is a part of the humidifier, with the small damper handle. The model 700 series and model 800 steam humidifier simply require the adjustment of the humidifier control where applicable.

Humidifier Control:
Digital Humidifier Control in Automatic Mode (See Figure A below):
No adjustment is necessary.

Digital Humidifier Control in Manual Mode (See Figure B below):
Set the knob to the "OFF" position.

Figure C Non Digital Automatic Humidifier Control 2003- current
No adjustment is necessary.

Figure D old style Non Digital Automatic Humidifier Control 1997-2003 

No adjustment is necessary.

Manual Humidifier Control (See Figure E, F and G): 

Set the knob to the "OFF" position.

Figure E

Figure F

Figure G

The AprilAire model 800 steam humidifier will operate with

• 110 volt power (11.5 gallon per day capacity)
• 208 volt power (20.5 gallon per day capacity) or
• 240 volt power (23.3 gallon per day capacity)

While 240 volt power is preferred to allow for the most capacity, the humidification requirement for your home determined by your HVAC installer will dictate which power supply to utilize.

The AprilAire model 800 steam humidifier is designed to operate with 120, 208 volts or 240 volts, however all current models are defaulted to operate with 240 volts for the maximum humidification output. At 240 volts the 800 would cost about 25 cents an hour to operate.

The run time of the humidifier will vary based on the age, cubic footage (square footage times ceiling height) and tightness of the home, as well as the operating time of the HVAC heating system. If the AprilAire model 800 steam humidifier were to run for 12 hours out of a 24 hour period it would cost about $3.00 per day or $90.00 per month. However, it is unlikely it will run 12 hours out of every 24 hour period and may be much less per month than the amount above. At 120 volts, the 800 could cost about 10 cents per hour to operate. If the AprilAire model 800 steam humidifier were to run for 12 hours out of a 24 hour period it would cost about $1.20 per day or $36 per month, but again actual run time will vary just as described in the 240 volt application.

While we do offer the water solenoid valve on our Estore, it is the only electrical component we have available for direct purchase.

From a safety standpoint, and to insure proper humidifier operation, electrical components such as the water solenoid valve should be installed by a local Healthy Air Pro.

The warranty of any electrical component will be void if it is not installed by a licensed HVAC installer. If you need the name of a local Healthy Air Pro, please use our Dealer locator:

The local Healthy Air Pro who installed your AprilAire Humidifier can help you obtain these parts, or you can search for another local Healthy Air Pro using our Dealer Locator.

We also offer an E-Store where you may purchase select humidifier parts.

These dehumidifiers (1710, 1710A, 1750, 1750A, 1770 and 1770A) include an onboard control which will automatically turn on the internal blower for 3 minutes at the end of each cycle period to sample the air and measure moisture level of the incoming ambient air.

This process determines if the relative humidity of the incoming air is above the set point of the control dial, (1–7). When the relative humidity in the home is above the set point, the dehumidifier will then energize its compressor and continue running until the set point is reached. The cycle period can be customized to 30 minutes, 1, 2, or 3 hours. The default is 1 hour.

Models 1710A and 1750A weigh 93 lbs.

Model 1770A weighs 100 lbs.

Model 1730A weighs 65 lbs.

Model 1830 weighs 67 lbs.

Models 1850/1850F/1850W weigh 70 lbs.

Model 1870 weighs 98 lbs.

Model E070 weighs 56 lbs.

Model E080 weighs 63 lbs.

Model E100 weighs 64 lbs.

Model E130 weighs 98 lbs.

All AprilAire Dehumidifiers are 110–120 VAC.

The current draw of each AprilAire Dehumidifier model is listed below.

1730A draws 7A,

1710A and 1750A draw 8A. 

1770A draws 14A.

1830 draws 6.3A

1850/1850W draw 8A.

1852 draws 8A.

E070 draws 6.3A.

E080 draws 5.1A.

E100 draws 6.9A.

E130 draws 8.3A.

AprilAire Dehumidifiers are designed to control airborne moisture in areas where the ambient indoor temperatures are between 65-80ºF. If the ambient air temperatures are lower than 65ºF, there is less moisture in the air because cold air doesn’t hold as much moisture as warm air. As a result, our dehumidifiers will remove less moisture at lower indoor ambient temperatures. 

Dehumidifiers, including AprilAire Dehumidifiers, are not designed to pull moisture off surfaces like windows, walls and floors. In order for any dehumidifier to attempt to remove moisture, the moisture needs to be in the air. 

Our AprilAire Dehumidifiers usually will not operate in the winter. Typical winter conditions in a home have an indoor ambient temperature of 73ºF with a relative humidity of 60% (58ºF dew point). The lowest dew point AprilAire Dehumidifiers will attempt to achieve is 40ºF. 

For instance, at indoor ambient conditions of 70ºF and 40% RH, there is a dew point temperature of 44ºF. If the outdoor temperature is 0ºF and the surface temperature of glass is 43ºF, condensation will form on the windows since the glass's surface temperature is below the dew point temperature of 44ºF. If the dew point is lower than the surface temperature, condensation will not form.

If condensation does form, a ventilation product is recommended.

The AprilAire Dehumidifier models (1830, 1850, 1850W and 1852) include an onboard control which will automatically turn on the internal blower for 3 minutes at the end of each hour to sample the air and measure the moisture level of the incoming ambient air. 

This process determines if the relative humidity of the incoming air is above the set point of the control dial (40%–80%). When the relative humidity in the home is above the set point, the dehumidifier will then energize its compressor and continue running until the set point is reached.

While this sample rate cannot be adjusted, changing the set point to a number lower than the current set point will cause the dehumidifier to start sampling right away.

AprilAire Electronic Air Cleaners carry a 5-year limited warranty. See the owner’s manual for details and complete the warranty registration for your AprilAire Electronic Air Cleaner.

The AprilAire Model 5000 has a service life of one year. Maintenance is simple and the filtering media is conveniently disposable.

Check your owner manual for specific information. 

AprilAire Thermostats have the option for fan on or auto.

In the “on” position, the heating and cooling system fan will run continuously 24/7. Continuous fan operation is desirable to provide maximum comfort in the home by eliminating hot or cold spots caused by poor airflow.

Continuous fan operation also is the most effective way to use a whole-house air cleaner such as an AprilAire High Efficiency Air Cleaner. In the “auto” mode, the fan will run only when the heating and cooling system is making a heating or cooling call.

AprilAire manufactures thermostats (models: 8446, 8448, 8465, 8466, 8476, 8570, 8600, 8620 and 8910), which interface with heat pumps.

Heat pumps include a secondary source of heat (typically a gas furnace or electric strip heat). This is activated by the AprilAire Thermostat when the heat pump isn’t capable of raising the indoor temperature to the desired set point and is referred to as staging. Anytime there is a desire to skip the staging process of the thermostat to raise the indoor temperature, the Emergency Heat mode can be manually activated.

This is done by changing the mode on your AprilAire Thermostat from Heat to Emergency Heat. The Emergency Heat mode skips the operation of the heat pump and only operates the secondary source of heat.

The AprilAire model 8400 series thermostats will hold the program for 30 to 45 seconds while the batteries are being replaced.

It is best to have the new batteries with you when removing the old batteries, otherwise if more than 45 seconds pass, the thermostat will need to be re-programmed.

The AprilAire model 8910 home comfort system is designed to control temperature as well as intuitively managing the indoor air comfort throughout your home.

It does this by operating AprilAire Indoor Air Quality products (IAQ) such as a humidifier, dehumidifier, air cleaner and ventilation system all from one control.

The AprilAire model 8910 home comfort system consist of a thermostat which installs in your living space and an equipment control module which installs near the heating and cooling system.

We ask for you to please contact your heating and cooling system installer to obtain an AprilAire model 8910 home comfort control system or if you need the name of a local dealer, please use our dealer locator. 

Yes, the AprilAire model 8910 Home Comfort Control can be used with a zoned comfort control system. The Model 8910 is designed to operate other AprilAire Indoor Air Quality products (IAQ) from one control.

When wired to an AprilAire zoned comfort control system the 8910 interface should be wired to the primary zone (largest zone, master bedroom suite etc…) and only the primary zone will be able to call for the operation of the IAQ products. Any of the zones can be the primary zone. The thermostat from the 8910 operates the zone it is connected to the same way any thermostat would.

The operation of the IAQ products by the 8910 interface is a separate function than a call for heating, cooling or fan operation.

The model 8600 and 8620 AprilAire Thermostats can control a two heat two cool conventional heat cool system or a 4 heat 2 cool heat pump system.

Both thermostats can be configured as programmable or non-programmable and include service reminders (humidifier, air filter, dehumidifier and HVAC system).

The model 8620 AprilAire Thermostat also includes an outdoor temperature sensor, offers event based air cleaning and includes a built-in relative humidity sensor. In addition to controlling temperature, the model 8620 can control one of the following: humidification, dehumidification or ventilation.

The temperature scale is adjustable between Fahrenheit and Celsius in the set up menu and is system setting option 04. The factory default is Fahrenheit.

To ensure accurate temperature control, thermostats should be mounted on an inside wall in a frequently occupied space which best represents the home’s temperature.

The thermostat should be mounted at least 18” from any outside wall and approximately 5’ above the floor and may be mounted to a vertical junction box.

Your thermostat should not be: behind doors, in corners or other dead air spaces; in direct sunlight or near lamps, appliances or other sources of heat; On an outside wall or a wall exposed to an unconditioned space (e.g., garage, etc.); In the flow path of a supply register, in stairways or near outside doors; On a wall where concealed pipes and/or ductwork will affect the thermostat; Near sources of electrical interference such as arcing relay contacts.

AprilAire Programmable Thermostats models 8463, 8465, 8466, 8476, 8570, 8600, 8620 and 8910 include a mode function.

One of the mode selections is off. The off mode simply does not allow the thermostat to make a call for heating or cooling. It has no affect on the programming of the thermostat. The thermostat will have to be placed into the heat, cool, on auto mode in order for the thermostat to operate the heating and cooling system.

AprilAire manufactures thermostats (models 8446, 8448, 8465, 8466, 8476, 8570, 8600, 8620, and 8910) which interface with heat pumps. Heat pumps include a secondary source of heat (typically a gas furnace or electric strip heat).

This is activated by the thermostat when the heat pump isn’t capable of raising the indoor temperature to the desired set point and is referred to as staging. Anytime there is a desire to skip the staging process of the thermostat to raise the indoor temperature, the Emergency Heat mode can be manually activated.

This is done by changing the mode on your thermostat from Heat to Emergency Heat. The Emergency Heat mode skips the operation of the heat pump and only operates the secondary source of heat.

The model 8910 home comfort control is designed to control temperature as well as intuitively managing the indoor air comfort throughout your home.

It does this by operating AprilAire Indoor Air Quality products (IAQ) such as a humidifier, dehumidifier, air cleaner and ventilation system all from one control.

The model 8910 home comfort system consist of a thermostat which installs in your living space and an equipment control module which installs near the heating and cooling system.

We ask for you to please contact your heating and cooling system installer to obtain an AprilAire model 8910 home comfort control system or if you need the name of a local dealer, please use our Dealer locator. 

Yes, the model 8910 Home Comfort Control can be used with a zoned comfort control system.

The Model 8910 is designed to operate other AprilAire Indoor Air Quality products (IAQ) from one control. When wired to a zoned comfort control system the 8910 interface should be wired to the primary zone (largest zone, master bedroom suite etc…) and only the primary zone will be able to call for the operation of the IAQ products. Any of the zones can be the primary zone.

The thermostat from the 8910 operates the zone it is connected to the same way any thermostat would. The operation of the IAQ products by the 8910 interface is a separate function than a call for heating, cooling or fan operation.

The model 8600 and 8620 AprilAire Thermostats can control a two heat two cool conventional heat cool system or a 4 heat 2 cool heat pump system.

Both thermostats can be configured as programmable or non-programmable and include service reminders (humidifier, air filter, dehumidifier and HVAC system).

The model 8620 thermostat also includes an outdoor temperature sensor, offers event based air cleaning and includes a built-in relative humidity sensor. In addition to controlling temperature, the model 8620 can control one of the following: humidification, dehumidification or ventilation.

The temperature scale s adjustable between Fahrenheit and Celsius in the set up menu and is system setting option 04. The factory default is Fahrenheit. To access the set up menu preform the following:

The temperature scale is adjustable in the set up menu and is system setting option 01. The factory default is Fahrenheit (setting range set to 0. Celsius setting range is 1). To access the set up menu perform the following: 

AprilAire Dehumidifier models 1710A, 1750A, 1770A 1830, 1850, 1850W 1852, 1870, E080, E100, and E130 can be controlled by any AprilAire Thermostat with Indoor Air Quality (IAQ) controls.

The dehumidifier must have been installed after February 2011, and for models 1710A, 1750A and 1770A, have a control board with the Local/External dip switch.

AprilAire Thermostats with IAQ controls include 8620, 8620W, 8910, 8910W, 8920W, 8820, 8830 and 8840. Your heating and cooling installer will know which model will work best for you

These dehumidifier models (1830, 1850, 1850W 1852, 1870, E080, E100 and E130) include an onboard control which will automatically turn on the internal blower for 3 minutes each hour to sample the air and measure the moisture level of the incoming ambient air.

This process determines if the relative humidity of the incoming air is above the set point (40%–80%). When the relative humidity in the home is above set the point, the dehumidifier will then energize its compressor and continue running until the set point is reached.