Aprilaire 8400 Series Dual-Stage Heating/Cooling Thermostat
About your new thermostat
Thermostat Features
All 8400 series thermostats
- Large, clear, backlit display is easy to read – even in the dark.
- Displays room temperature, temperature setting, and optional outdoor temperature.
- Front battery door access for fast, easy replacement.
- Built in compressor protection.
- Circulation fan mode for air cleaning.
- Air filter, humidifier, dehumidifier, and HVAC service indicators.
- Auto backlight (activated with first button press).
Programmable models only (8463, 8465, 8466)
- Separately programmable weekday/weekend schedules.
- Easy to use temperature control can override program schedule at any time.
- Progressive recovery.
How to identify your thermostat ’s model number
To locate the model number, remove the battery cover.
- Model 8444 Heat/Cool Non-Programmable
- Model 8446 Heat Pump Non-Programmable
- Model 8448 Heat/Cool or Heat Pump Multi-Stage Non-Programmable
- Model 8463 Heat/Cool Programmable
- Model 8465 Heat Pump Programmable
- Model 8466 Heat/Cool or Heat Pump Multi-Stage Programmable
Non-programmable models
Controls & display overview – models 8444, 8446, 8448
Note: Backlight is activated with the first button press and automatically turns off.
Programmable Models
Controls & display overview – models 8463, 8465, 8466
Note: Backlight is activated with the first button press and automatically turns off.
Operation – ALL MODELS
Select system mode (OFF/HEAT/EM-HEAT/COOL/AUTO)
Press 
to select:
- AUTO: The thermostat automatically selects heating or cooling depending on the indoor temperature.
- OFF: Heating and cooling systems are off.
- HEAT: The thermostat controls only the heating system.
- COOL: The thermostat controls only the cooling system.
- EM-HEAT: Thermostat controls emergency/auxiliary heat. The heat pump will not operate. (Only for heat pumps with auxiliary heat on models 8446, 8465, 8448HP, and 8466HP.)
Change temperature setTING
Applies to programmable versions (8463, 8465, 8466) when in HOLD mode.
Press 
to adjust the current setting.
In AUTO use to switch between the HEAT and COOL settings.
Select fan setting (ON/AUTO/CIRC)
Press
to select:
- ON: Fan runs continuously. Use this mode for maximum air circulation/air cleaning.
- AUTO: Fan runs only when the heating or cooling system is on.
- CIRC: Same as AUTO, but if the fan has been off for 20 minutes the fan will be activated for a 10 minute cycle.
Use this mode for a balance of energy savings and air circulation/cleaning.
Reset service reminder messages
Press and hold together for three seconds to reset a service reminder message.
The thermostat can either be AC or battery powered or both. When wired to be AC powered, the batteries are optional and only provide backup power to the clock. The thermostat has a memory backup that saves the thermostat’s settings in case of a power interruption. The reset button located under the battery cover can be used to reset the thermostat back to factory defaults.
Set time and day
- Press
to enter time setting mode. Hour and AM/PM are flashing.
- press adjust the hour.
- Press, and the minutes flash. Press to adjust the minutes.
- Press, and the day flashes. Press adjust day.
- Press to end. “DONE” will display.
The thermostat will return to normal mode if no key is pressed within 3 seconds.
Understanding program schedules
The daily schedule is split into four sections:
- WAKE: 6 am-8 am – Temperature you would prefer to wake up to, until you leave for the day.
- LEAVE 8am-5 pm – Temperature when you are away from the house during the day.
- RETURN: 5pm-10pm – Temperature you would prefer to return to, until bedtime.
- SLEEP: 10pm-6am – Temperature you would prefer during the night.
The times shown are the defaults. The start time and temperature of each section can be changed to fit your schedule (see page 10).
Operation & Programming – PROGRAMMABLE MODELS ONLY (8463, 8465, 8466)
Understandin g program schedules (continued)
|
Event |
Event designator |
Start time |
Set temps | |
| Heat | Cool | |||
| 1 | WAkE | 6:00AM | 70°F (21°C) | 78°F (26°C) |
| 2 | LEAVE | 8:00AM | 62°F (17°C) | 85°F (29°C) |
| 3 | RETURN | 5:00PM | 70°F (21°C) | 78°F (26°C) |
| 4 | SLEEP | 10:00PM | 62°F (17°C) | 82°F (28°C) |
Progressive recovery
The Progressive Recovery feature allows the thermostat to activate the heating and cooling equipment prior to an event in order to reach the desired temperature at the start of the next scheduled event.
Example:
Set the Wake time to 6 am, and the temperature to 70°.
The heat will come on before 6 am, so the temperature is 70° by the time you wake at 6.
Changing program schedules
- Press twice to enter program setting mode.
The start time of the WAKE event is flashing.
- Press to adjust the start time
- Press, the HEAT setting flashes. Press to adjust the heat setting.
- Press, COOL setting flashes. Press to adjust the cool setting.
- Pressto advance to the next event, and repeat steps 2-5 for LEAVE, RETURN and SLEEP events.
- Pressto change to the weekend program. Repeat steps 2-5 for the weekend program.
- Pressto end. “DONE” will display.
The thermostat will return to normal mode if no key is pressed in 3 seconds.
Program schedule overrides (temporary, permanent)
Temporary program override
Press or to immediately adjust the temperature. This will temporarily override the temperature setting for the current programmed time period. The new temperature setting will be maintained until the next time period of the programmed schedule. To cancel the temporary override, adjust the temperature setting back to the programmed temperature, or press
twice.
Permanent program override
Press to permanently hold the temperature at its current setting. This will override the temperature settings for all time periods of the programmed schedule. With the thermostat in permanent override, the thermostat temperature can be manually adjusted and will stay at that setting until the override is cancelled. To cancel the permanent override press .
ELECTRONIC THERMOSTAT FIVE YEAR LIMITED WARRANTY
Your Research Products Corporation Aprilaire® Thermostat unit is expressly warranted for five (5) years from date of installation to be free from defects in materials or workmanship.
Research Products Corporation’s exclusive obligation under this warranty shall be to supply, without charge, a replacement for any thermostat which is found to be defective within such five (5) year period and which is returned, together with the date of installation, no later than thirty (30) days after said five (5) year period by you to either your original supplier or to Research Products Corporation, Madison, Wisconsin 53701. THIS WARRANTY SHALL NOT OBLIGATE RESEARCH PRODUCTS CORPORATION FOR ANY LABOR COSTS AND SHALL NOT APPLY TO DEFECTS IN WORKMANSHIP OR MATERIALS FURNISHED BY Y OUR INSTALLER AS CONTRASTED TO DEFECTS IN THE THERMOSTAT ITSELF. IMPLIED WARRANTIES OF MERCHANTABILITY OF FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE AFORESAID FIVE Y EAR PERIOD. RESEARCH PRODUCTS CORPORATION’S LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, OTHER THAN DAMAGES FOR PERSONAL INJURIES, RESULTING FROM ANY BREACH OF THE AFORESAID IMPLIED WARRANTIES OR THE ABOVE LIMITED WARRANTY IS EXPRESSLY EXCLUDED. THIS LIMITED WARRANTY IS VOID IF DEFECT(S) RESULT FROM FAILURE TO HAVE THIS THERMOSTAT INSTALLED BY A QUALIFIED HEATING AND AIR CONDITIONING CONTRACTOR. IF THE LIMITED WARRANTY IS VOID DUE TO FAILURE TO USE A QUALIFIED CONTRACTOR, ALL DISCLAIMERS OF IMPLIED WARRANTIES SHALL BE EFFECTIVE UPON INSTALLATION. Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or consequential damages, so the above exclusions or limitations may not apply to you.
This warranty gives you specific legal rights and you may also have other rights which vary from state to state. This equipment if installed in strict accordance with the manufacturer’s instructions, complies with the limits for a Class B computing device pursuant to Subpart J of Part 15 of FCC Rules.
Warrant y Registration
Please…Take a few minutes to visit us on-line at www.aprilaire.com to register your Aprilaire product.
If you do not have on-line access, please mail a postcard with your name, address, phone number, product purchased and date of purchase to: Research Products Corporation, P.O. BOX 1467, Madison, WI 53701
Your Warranty Registration information will not be sold or shared outside of this company.
RESEARCH PRODUCTS CORPORATION
P.O. BOX 1467 • MADISON, WI 53701-1467 • www.aprilaire.com
REFERENCE:
Download Manual: Aprilaire 8400 Series Dual-Stage Heating/Cooling Thermostat Owner Manual
Aprilaire 8400 Series Dual-Stage Heating/Cooling Thermostat Owner Manual
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