Aprilaire 8466 Users Manual
Aprilaire-8444-Users-Manual-650958 aprilaire-8444-users-manual-650958
Aprilaire-8448-Users-Manual-650959 aprilaire-8448-users-manual-650959
Aprilaire-8446-Users-Manual-650957 aprilaire-8446-users-manual-650957
Aprilaire-8463-Users-Manual-650956 aprilaire-8463-users-manual-650956
2015-03-12
: Aprilaire Aprilaire-8466-Users-Manual-650955 aprilaire-8466-users-manual-650955 aprilaire pdf
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Page Count: 12

8400 Series Thermostats
READ AND SAVE THESE INSTRUCTIONS
Owner’s Manual
Includes  
Operating Instructions and 
Warranty Information
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2
Thermostat features.............................................................................3
How to identify your thermostat’s model number ...................................................3
Controls & display overview 
 ...................................................... 
 ..........................................................
TABLE OF CONTENTS
ABOUT YOUR NEW THERMOSTAT
OPERATION & PROGRAMMING 
WARRANTY
Operation (all models) 
  ................................................................ 
 ..................................................................... 
 ...............................................................7 
  ................................................................7 
  .............................................................7
Programmable models only (8463, 8465, 8466) 
 .............................................................................. 
 ................................................................ 
 ...........................................................................9 
  ...................................................................10 
  ................................................11
 ................................................................................12 
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ABOUT YOUR NEW THERMOSTAT
THERMOSTAT FEATURES
Model 8444
Model 8446
Model 8448 
Model 8463
Model 8465
Model 8466 
All 8400 series thermostats
Programmable models only (8463, 8465, 8466)
HOW TO IDENTIFY YOUR THERMOSTAT’S 
MODEL NUMBER
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CONTROLS & DISPLAY OVERVIEW – MODELS 8444, 8446, 8448
NOTE:
 
HEAT PUMP MODELS ONLY
ABOUT YOUR NEW THERMOSTAT – NON-PROGRAMMABLE MODELS
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CONTROLS & DISPLAY OVERVIEW – MODELS 8463, 8465, 8466
NOTE:
 
HEAT PUMP MODELS ONLY
 
ABOUT YOUR NEW THERMOSTAT – PROGRAMMABLE MODELS
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OPERATION – ALL MODELS
SELECT SYSTEM MODE  
(OFF/HEAT/EM-HEAT/COOL/AUTO)
Press 
AUTO:
OFF:
HEAT:
COOL:
EM-HEAT:
Press  
 
CHANGE TEMPERATURE SETTING
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SELECT FAN SETTING (ON/AUTO/CIRC)
Press 
ON:
AUTO:
CIRC:
OPERATION – ALL MODELS
BATTERY INSTALLATION AND RESET BUTTON
 
RESET SERVICE REMINDER MESSAGES
Press and hold  
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SET TIME AND DAY
2.  Press  
3.  Press Press 
 Press Press 
 Press 
OPERATION & PROGRAMMING – PROGRAMMABLE MODELS ONLY (8463, 8465, 8466)
1.  Press 
UNDERSTANDING PROGRAM SCHEDULES
WAKE:
LEAVE:
RETURN:
SLEEP:
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Event Event designator Start time
Set temps
Heat Cool
1   
2   
3   
    
OPERATION & PROGRAMMING – PROGRAMMABLE MODELS ONLY (8463, 8465, 8466)
UNDERSTANDING PROGRAM SCHEDULES (CONTINUED)
PROGRESSIVE RECOVERY
Example:  
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CHANGING PROGRAM SCHEDULES
OPERATION & PROGRAMMING – PROGRAMMABLE MODELS ONLY (8463, 8465, 8466)
1.  Press 
2.  Press  
3.  Press Press 
 Press Press 
 Press 
 Press 
7.  Press 
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PROGRAM SCHEDULE OVERRIDES (TEMPORARY, PERMANENT)
OPERATION & PROGRAMMING – PROGRAMMABLE MODELS ONLY (8463, 8465, 8466)
Temporary program override
Press  
press 
Permanent program override
Press 
press .
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12
www.aprilaire.com
61000651   10.09
B2204776C
ELECTRONIC THERMOSTAT FIVE YEAR LIMITED WARRANTY
®
                  
             
                
       
WARRANTY REGISTRATION
Your Warranty Registration information will not be sold or shared outside of this company.
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