Aprilaire 8400 series User manual

READ AND SAVE THESE INSTRUCTIONS
Thermostat
OWNER’S MANUAL
8400 Series
Thermostats
Product Info &
Digital Manual

TABLE OF CONTENTS
ABOUT YOUR NEW THERMOSTAT � � � � � � � � � � � � � � � � � � 3
Thermostat Features� � � � � � � � � � � � � � � � � � � � � � � � � � � 3
How to Identify Your Thermostat’s
Model Number� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3
QUICK REFERENCE TO CONTROLS & DISPLAY � � � � � 4
Non Programmable Models
(8444, 8446, 8448) � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 4
Programmable Models
(8463, 8465, 8466)� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
OPERATION (ALL MODELS) � � � � � � � � � � � � � � � � � � � � � � � � � � � 6
Select System Mode
(AUTO/OFF/HEAT/COOL/EM-HEAT) � � � � � � � � � � � � � � 6
Change Temperature Setting � � � � � � � � � � � � � � � � � 6
Select Fan Setting (ON/AUTO/CIRC) � � � � � � � � � � � 7
Reset Service Reminder Messages� � � � � � � � � � � � 7
Battery Installation and Reset Button � � � � � � � � � 7
OPERATION & PROGRAMMING
(PROGRAMMABLE MODELS ONLY 8463, 8465, 8466)� � � 8
Set Time and Day � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 8
Understanding Program Schedules� � � � � � � � � � � 8
Progressive Recovery � � � � � � � � � � � � � � � � � � � � � � � � � � 9
Changing Program Schedules � � � � � � � � � � � � � � � 10
Program Schedule Overrides
(Temporary, Permanent)� � � � � � � � � � � � � � � � � � � � � � � 11
LIMITED WARRANTY � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 12
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 lter, humidier, dehumidier, and HVAC
service reminders�
• Auto backlight (activated with rst 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
ABOUT YOUR NEW THERMOSTAT
MODEL
NUMBER
32

QUICK REFERENCE TO CONTROLS & DISPLAY
NON-PROGRAMMABLE MODELS (8444, 8446, 8448)
PROGRAMMABLE MODELS (8463, 8465, 8466)
NOTE: BACKLIGHT IS ACTIVATED WITH FIRST BUTTON PRESS AND AUTOMATICALLY TURNS OFF.
NOTE: BACKLIGHT IS ACTIVATED WITH FIRST BUTTON PRESS AND AUTOMATICALLY TURNS OFF.
CURRENT INDOOR TEMPERATURE
SYSTEM MODE
SETTING
FAN SETTING
SYSTEM MODE
FAN
BATTERY DOOR
MESSAGE CENTER LOW BATTERY WARNING
QUICK REFERENCE CARD
OUTDOOR TEMPERATURE (OPTIONAL)
TEMPERATURE SETTING
EQUIPMENT STATUS
EMERGENCY HEAT (RED)
SYSTEM FAULT (YELLOW)
INDICATOR SHOWS THROUGH HOUSING
HEAT PUMP MODELS ONLY
UP
DOWN
CURRENT INDOOR TEMPERATURE
SYSTEM MODE
SETTING
FAN SETTING
SYSTEM MODE
FAN
BATTERY DOOR
MESSAGE CENTER LOW BATTERY WARNING
QUICK REFERENCE CARD
OUTDOOR TEMPERATURE (OPTIONAL)
TEMPERATURE SETTING
EQUIPMENT STATUS
UP
DOWN
PROGRAM
CURRENT
SCHEDULE
PERIOD
HOLD
CURRENT TIME
EMERGENCY HEAT (RED)
SYSTEM FAULT (YELLOW)
INDICATOR SHOWS THROUGH HOUSING
HEAT PUMP MODELS ONLY
54

SELECT SYSTEM MODE
(AUTO/OFF/HEAT/COOL/EM-HEAT)
Press to select:
AUTO: Thermostat automatically selects heating
or cooling depending on the indoor temperature�
OFF: Heating and cooling systems are off�
HEAT: Thermostat controls only the heating
system�
COOL: Thermostat controls only the cooling
system�
EM-HEAT: Thermostat controls emergency/
auxiliary heat� Heat pump will not operate�
(Only for heat pumps with auxiliary heat on
models 8446, 8465, 8448HP and 8466HP�)
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 ensures the fan is
on for at least 20 minutes per hour� Use this
mode for a balance of energy savings and air
circulation/cleaning�
CHANGE TEMPERATURE SETTING
Applies to programmable models (8463,
8465, 8466) when in HOLD mode and to
non-programmable models (8444, 8846, 8448)�
Press or to adjust the current setting�
In AUTO use to switch between the HEAT
and COOL setting�
BATTERY INSTALLATION AND RESET BUTTON
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�
RESET SERVICE REMINDER MESSAGES
Press and hold and simultaneously for
three seconds to reset a service reminder message�
OPERATION (ALL MODELS)
RESET
BUTTON
76

SET TIME AND DAY
1. Press to enter time setting mode� Hour
and AM/PM are ashing.
2. Press or to adjust the hour�
3. Press , the minutes ash. Press or
to adjust the minutes�
4. Press , the day ashes. Press or
to adjust day�
5. Press to end� DONE will display�
The thermostat will save changes and return to
Normal mode if no key is pressed in 20 seconds�
UNDERSTANDING PROGRAM SCHEDULES
The daily schedule is split into four sections:
WAKE 6:00 am-8:00 am
Temperature you would prefer to wake up to,
until you leave for the day�
LEAVE 8:00 am-5:00 pm
Temperature when you are away from the
house during the day�
RETURN 5:00 am-10:00 pm
Temperature you would prefer to return to,
until bedtime�
SLEEP 10:00 pm-6:00 am
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 t your schedule (see page 10).
Event Event designator Start time
Set temps
Heat Cool
1WAKE 6:00 am 70°F (21°C) 78°F (26°C)
2LEAVE 8:00 am 62°F (17°C) 85°F (29°C)
3RETURN 5:00 pm 70°F (21°C) 78°F (26°C)
4SLEEP 10:00 pm 62°F (17°C) 82°F (28°C)
PROGRESSIVE RECOVERY
The Progressive Recovery feature, if enabled by the installer, allows the thermostat to activate the
heating and cooling equipment PRIOR to a scheduled event in order to reach the desired temperature
at the start of that scheduled event. When a heating or cooling call is active for Progressive Recovery,
the current event schedule will ash.
EXAMPLE: Set the WAKE time to 6:00 am, and the temperature to 70°. The heat will come on before 6:00
am, so the temperature is 70° by the time you wake at 6:00 am�
OPERATION & PROGRAMMING
(PROGRAMMABLE MODELS ONLY 8463, 8465, 8466)
98

CHANGING PROGRAM SCHEDULES PROGRAM SCHEDULE OVERRIDES (TEMPORARY, PERMANENT)
1. Press twice to enter program setting
mode� If the backlight is not already active the
rst button press will activate the backlight and
two additional button presses are required�
Start time of the WAKE event is ashing.
TEMPORARY PROGRAM OVERRIDE PERMANENT 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� If the backlight
is not already active the rst button press will
activate the backlight and two additional button
presses are required�
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 �
2. Press or to adjust the start time
3. Press , HEAT setting ashes. Press
or to adjust the heat setting�
4. Press , COOL setting ashes. Press
or to adjust the cool setting�
5. Press to advance the next event, and
repeat steps 2-5 for LEAVE, RETURN and SLEEP
events�
6. Press to change to weekend program�
Repeat steps 2-5 for the weekend program�
7. Press to end� DONE will display�
The thermostat will save changes and return to
Normal mode if no key is pressed in 20 seconds�
1110

LIMITED WARRANTY
Your AprilAire® Thermostat is expressly warranted for ve (5) years from date of installation to be free from defects in materials or
workmanship. Any modications to the product voids the warranty.
The exclusive obligation of AprilAire under this warranty shall be to supply, without charge, a replacement for any thermostat which is
found to be defective within such ve (5) year period and which is returned not later than thirty (30) days after said ve (5) year period
by you to either your original supplier or to AprilAire, Madison, Wisconsin 53701, together with the installation date of the thermostat.
THIS WARRANTY SHALL NOT OBLIGATE APRILAIRE FOR ANY LABOR COSTS AND SHALL NOT APPLY TO DEFECTS IN WORKMANSHIP OR MATERIALS
FURNISHED BY YOUR INSTALLER AS CONTRASTED TO DEFECTS IN THE THERMOSTAT ITSELF�
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE AFORESAID FIVE
YEAR PERIOD� THE APRILAIRE 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 DEFECTS(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 exclusion or limitations may not apply to you�
This warranty gives you specic 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�
WARRANTY REGISTRATION
Visit us online at aprilaire.com to register your AprilAire product� If you do not have online access, please mail a postcard with
your name, address, phone number, email address, product purchased, model number, date of purchase, and dealer name and
address to: AprilAire, P.O. Box 1467, Madison, WI 53701.
Your warranty registration information will not be sold or shared outside of this company.
B2204776E • 61000651 • 6.22
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