8400 Series Thermostats
READ AND SAVE THESE INSTRUCTIONS
Owner’s Manual
Includes
Operating Instructions and
Warranty Information
61000651C 8400 Tstat Owners.indd 1 10/13/09 11:13:35 AM
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
.............................................................................12
61000651C 8400 Tstat Owners.indd 2 10/13/09 11:13:35 AM
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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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4
CONTROLS & DISPLAY OVERVIEW – MODELS 8444, 8446, 8448
NOTE:









 







HEAT PUMP MODELS ONLY


ABOUT YOUR NEW THERMOSTAT – NON-PROGRAMMABLE MODELS
61000651C 8400 Tstat Owners.indd 4 10/13/09 11:13:36 AM
5
CONTROLS & DISPLAY OVERVIEW – MODELS 8463, 8465, 8466
NOTE:









 







HEAT PUMP MODELS ONLY









ABOUT YOUR NEW THERMOSTAT – PROGRAMMABLE MODELS
61000651C 8400 Tstat Owners.indd 5 10/13/09 11:13:36 AM
6
OPERATION – ALL MODELS
SELECT SYSTEM MODE
(OFF/HEAT/EM-HEAT/COOL/AUTO)
Press

AUTO:

OFF:
HEAT:
COOL:
EM-HEAT:





Press
 



CHANGE TEMPERATURE SETTING
61000651C 8400 Tstat Owners.indd 6 10/13/09 11:13:37 AM
7
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
 

61000651C 8400 Tstat Owners.indd 7 10/13/09 11:13:37 AM
8
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:




61000651C 8400 Tstat Owners.indd 8 10/13/09 11:13:38 AM
9
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:



61000651C 8400 Tstat Owners.indd 9 10/13/09 11:13:38 AM
10
CHANGING PROGRAM SCHEDULES
OPERATION & PROGRAMMING – PROGRAMMABLE MODELS ONLY (8463, 8465, 8466)
1. Press 

2. Press
 
3. Press
Press 

 Press Press 

 Press


 Press


7. Press



61000651C 8400 Tstat Owners.indd 10 10/13/09 11:13:39 AM
11
PROGRAM SCHEDULE OVERRIDES (TEMPORARY, PERMANENT)
OPERATION & PROGRAMMING – PROGRAMMABLE MODELS ONLY (8463, 8465, 8466)
Temporary program override
Press
 





press

Permanent program override
Press






press
.
61000651C 8400 Tstat Owners.indd 11 10/13/09 11:13:39 AM
12

www.aprilaire.com
61000651 10.09
B2204776C



ELECTRONIC THERMOSTAT FIVE YEAR LIMITED WARRANTY

®





              


             
         






       

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61000651C 8400 Tstat Owners.indd 12 10/13/09 11:13:40 AM