Lennox 81M26 Thermostat User Manual

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81M26ꢀ  
81M27ꢀ  
81M28  
DELUXE  
PROGRAMMABLE  
THERMOSTATS  
ꢀ
ꢀ
ꢀ
with Humidity Control  
User's Manual  
Menu Driven Display  
Fully Programmable  
24 VAC with Worry-Free  
Memory Storage  
1 Heat / 1 Cool, 2 Heat / 2 Cool  
and Heat Pump Models  
110-1052F  
504, 684M  
Five Year Warranty  
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2
IMPORTANT SAFETY INFORMATION  
WARNING:  
!
• DO NOT USE WITH COMMERCIAL EQUIPMENT.  
• Always turn off power at the main power source by unscrewing fuse or switching circuit  
breaker to the off position before installing, removing, or cleaning this thermostat.  
• Read all of the information in this manual before programming this thermostat.  
• This is a 24V AC low-voltage thermostat. Do not install on voltages higher than 30V AC.  
• All wiring must conform to local and national building and electrical codes and ordinances.  
• Do not short (jumper) across terminals on the gas valve or at the system control to test  
installation.This will damage the thermostat and void the warranty.  
• Do not connect ground to any terminal in this unit.  
• This thermostat is equipped with automatic compressor protection to prevent potential  
damage due to short cycling or extended power outages.The short cycle protection provides a  
5-minute delay between heating or cooling cycles to prevent the compressor from being dam-  
aged.  
• Do not switch system to cool if the temperature is below 45°F (7°C).This can damage the cool-  
ing system and may cause personal injury.  
• Use this thermostat only as described in this manual.  
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TABLE OF CONTENTS  
How do I change the time of day and day of the week? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 4  
How do I turn on the heating or cooling cycles? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 5  
How do I cycle the fan? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 6  
How does INTERMITTENT FAN work? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 6  
How do I temporarily change the temperature? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 7  
Can I set a temporary adjustment for longer than 3 hours? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 8  
Can I set the thermostat to hold one temperature indefinitely? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 9  
How do I return to the Program Mode after being in HOLD? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 9  
How do I set the Vacation Mode? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 10  
How do I program my thermostat? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 11  
How do I copy one day’s program to another day? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 13  
What is an event? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 14  
How do I know what program is right for me? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 14  
How do I set the Humidify Levels? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 15  
How do I set the Dehumidify Levels? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 15  
What is the difference between Basic and Precision modes? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 15  
What happens if the mode is set to OFF? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 16  
What is the difference between Basic and Basic/DP? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 16  
What is the Dew Point Adjustment function? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 16  
Can I change the humidifier maintenance service interval? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 16  
What are the USER settings? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 17  
Detailed Information on the USER SETTINGS (Or what do these USER SETTINGS do?) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 18  
When would I need to change the USER settings? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 20  
What are the INSTALLER settings? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 21  
When would I need to change the INSTALLER settings? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 24  
How does Energy Efficient Recovery™ (EER™) work? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 25  
How does my remote outdoor sensor work? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 25  
Where should I install a remote outdoor sensor? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 25  
What do the lights below the display mean? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 25  
What should I do if my power goes out? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 26  
How do I reset the thermostat program to factory conditions? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 26  
How do I know if the heating or cooling is on? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 26  
Who do I contact for more information? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 26  
My energy bills are too high. Is there anything I can do? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 27  
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How do I change the time of day and day of the week?  
MONDAY  
3:29 PM  
From the main screen press MENU.  
COOL  
FAN AUTO  
78  
SET AT  
78  
HOLD TEMP  
MENU  
MENU  
BACK  
Use the UP or DOWN arrows to highlight DAY/TIME.  
Press SELECT.  
DAY / TIME  
FAN  
USER SETTINGS  
INSTALLER SETTINGS  
HOME  
SELECT  
SET DAY & TIME  
FRIDAY  
DAY  
12 PM  
06  
HOUR  
Use the UP or DOWN arrow to highlight DAY, HOUR  
or MINUTES. Press SET.  
MINUTES  
SET DAY & TIME  
FRIDAY  
MAIN MENU  
SET  
DAY  
12 PM  
31  
HOUR  
MINUTES  
Use the UP or DOWN arrow to scroll through  
the days of the week, hours or minutes.  
Press SET to select desired value.  
Press MAIN MENU when complete.  
MAIN MENU  
SET  
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How do I turn on the heating or cooling cycles?  
MONDAY  
3:29 PM  
From the main screen press MENU.  
COOL  
FAN AUTO  
78  
SET AT  
78  
MENU  
HOLD TEMP  
MENU  
PROGRAM  
Use the UP or DOWN arrows to highlight HEAT/COOL.  
Press SELECT.  
HEAT / COOL  
DAY / TIME  
FAN  
MORE  
HEAT / COOL SETTINGS  
HOME  
SELECT  
HEAT  
Use the UP or DOWN arrows to highlight HEAT, COOL  
or AUTO CHANGEOVER. Press SELECT. The SELECT  
button will turn on or off the desired cycle. You do not  
have to turn off HEAT to turn on COOL. When HEAT or  
COOL or AUTO CHANGEOVER is turned on, all others  
are automatically shut off. After pressing the SELECT  
button, the main screen will automatically appear.  
COOL  
AUTO CHANGEOVER  
EMERGENCY HEAT  
MAIN MENU  
HEAT / COOL SETTINGS  
HEAT  
SELECT  
COOL  
NOTE: Emergency heat is used only on the 81M28 model.  
It should only be used if the primary stage of heating  
AUTO CHANGEOVER  
EMERGENCY HEAT  
MAIN MENU  
cannot maintain the temperature of the conditioned space.  
(AUTO CHANGEOVER will appear in the menu only if it is  
enabled in Installer Settings.)  
SELECT  
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How do I cycle the fan?  
MONDAY  
3:29 PM  
COOL  
FAN AUTO  
From the main screen press MENU.  
78  
SET AT  
78  
HOLD TEMP  
MENU  
MENU  
PROGRAM  
Use the UP or DOWN buttons until FAN is highlighted. Press SELECT.  
HEAT / COOL  
DAY / TIME  
FAN  
MORE  
HOME  
SELECT  
FAN MENU  
Use the UP or DOWN buttons to highlight FAN settings.  
Press SELECT.  
FAN SETTINGS  
Three choices are available:  
FAN PROGRAM  
FAN SETTINGS  
ON will turn the fan on continuously.  
ON  
AUTO will turn the fan on only  
MAIN MENU  
SELECT  
AUTO  
when there is a call for heating  
or cooling.  
INTERMITTENT will turn the fan  
on for a set period of time for a  
given interval. Highlight the choice  
you desire and press SELECT.  
INTERMITTENT  
MAIN MENU  
SELECT  
How does INTERMITTENT FAN work?  
INTERMITTENT FAN  
INTERMITTENT will turn the fan on for a set period of time for a  
given interval when the heating or cooling equipment is idle.  
ON ꢀ  
TIMEꢀ  
5ꢀ MIN  
20ꢀ MIN  
The thermostat will cycle the fan on for the set ON cycle. The fan will remain off for the set OFF cycle.  
OFF ꢀ TIMEꢀ  
If the HVAC system runs for a longer period than the ON cycle, the OFF cycle will start counting over  
again when the system shuts off.  
FAN MENU  
SELECT  
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How do I temporarily change the temperature?  
MONDAY  
3:29 PM  
COOL  
From the main screen, press the UP or DOWN button. The screen  
will change to the following.  
FAN AUTO  
78  
SET AT  
78  
HOLD TEMP  
MENU  
SET TEMPERATURE AT  
Use the UP or DOWN button to adjust to the desired  
temperature. This is a temporary 3-hour hold or until  
the next programmed event, whichever is shorter.  
For a longer duration see page 8.  
F
70 ˚  
UNTIL 6:29 PM  
HOME  
SET TEMP  
After pressing the SET  
TEMP button or after 5  
seconds the screen will  
indicate the new setpoint  
and its duration. To return  
to the normal operating  
program mode, press  
RESUME PROGRAM.  
SET AT 70°F UNTIL 6:29 PM  
COOL  
F
FAN AUTO  
70˚  
OUTSIDE 24˚F  
RESUME  
PROGRAM  
MENU  
NOTE: Temporary temperature changes override  
the Auto Changeover function.  
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Can I set a temporary adjustment for longer than 3 hours?  
MONDAY  
3:29 PM  
COOL  
FAN AUTO  
Yes you can! Press the HOLD TEMP button. The following screen appears.  
78  
SET AT  
78  
HOLD TEMP  
MENU  
HOLD SETTINGS  
PERMANENT HOLD  
Press the DOWN button to highlight TEMPORARY HOLD. Press SELECT.  
TEMPORARY HOLD  
VACATION HOLD  
HOME  
SELECT  
TEMPORARILY AT  
The temperature should be highlighted.  
F
Press the UP or DOWN button to adjust  
70 ˚  
the temperature. Press SET TEMP.  
UNTIL 3:49 PM  
HOME  
SET TEMP  
TEMPORARILY AT  
F
70 ˚  
The time should be highlighted. Press the UP or  
DOWN button to adjust the time. Press SET TIME.  
UNTIL 3:49 PM  
SET AT 70°F UNTIL 8:29 PM  
HOME  
SET TIME  
COOL  
FAN AUTO  
F
°
The main screen will now indicate a TEMPORARY HOLD until the  
desired time. Press RESUME PROGRAM to return to the program  
operating mode.  
77  
RESUME  
PROGRAM  
MENU  
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Can I set the thermostat to hold one temperature indefinitely?  
MONDAY  
3:29 PM  
COOL  
You can do that too! From the main screen press the HOLD TEMP button. The following screen appears.  
FAN AUTO  
78  
SET AT  
78  
HOLD TEMP  
MENU  
HOLD SETTINGS  
The PERMANENT HOLD feature should be highlighted. If it is not, use  
the UP or DOWN arrow to highlight it. Press SELECT.  
PERMANENT HOLD  
TEMPORARY HOLD  
VACATION HOLD  
HOME  
PERMANENTLY AT  
SELECT  
F
Use the UP or DOWN arrow to set the temperature to  
the desired level. Press SET TEMP.  
70 ˚  
HOME  
SET TEMP  
PERMANENTLY SET AT 71°F  
The main screen will now  
F
COOL  
FAN AUTO  
indicate a PERMANENT  
HOLD. Press RESUME  
PROGRAM to return to the  
program operating mode.  
70 ˚  
OUTSIDE 24˚F  
RESUME  
PROGRAM  
MENU  
How do I return to the Program Mode after being in HOLD?  
PERMANENTLY SET AT 71°F  
F
COOL  
FAN AUTO  
Simply press the RESUME PROGRAM button. This works from all HOLD screens.  
70 ˚  
OUTSIDE 24˚F  
RESUME  
PROGRAM  
MENU  
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How do I set the Vacation Mode?  
MONDAY  
3:29 PM  
COOL  
Take a trip and don’t worry about the temperature! From the main screen press the HOLD TEMP  
button. The following screen appears.  
FAN AUTO  
78  
SET AT  
78  
HOLD TEMP  
MENU  
HOLD SETTINGS  
Use the UP or DOWN arrow to highlight the VACATION HOLD feature.  
PERMANENT HOLD  
Press SELECT.  
TEMPORARY HOLD  
VACATION HOLD  
HOME  
SELECT  
VACATION SETTING  
F
The temperature should be highlighted. Use the UP or  
DOWN arrow to change to the desired temperature.  
Press SET TEMP.  
70˚  
FOR 7 DAYS  
HOME  
SET TEMP  
VACATION SETTING  
F
The number of days should be highlighted. Use  
the UP or DOWN arrow to set the length of  
your vacation. Press SET DAY.  
70˚  
FOR 7 DAYS  
HOME  
SET DAY  
SET AT 70°F FOR 7 DAYS  
COOL  
F
°
FAN AUTO  
77  
The main screen will now indicate the VACATION settings.  
Press RESUME PROGRAM to cancel and return to the  
program operating mode.  
OUTSIDE 24°F  
RESUME  
PROGRAM  
MENU  
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How do I program my thermostat?  
MONDAY  
3:29 PM  
COOL  
FAN AUTO  
From the main screen press the MENU button.  
78  
SET AT  
78  
HOLD TEMP  
MENU  
MENU  
PROGRAM  
Use the UP or DOWN button to highlight PROGRAM. Press SELECT.  
You can select a variety of programming. Make your  
HEAT / COOL  
DAY / TIME  
FAN  
MORE  
HOME  
SELECT  
SELECT PROGRAM DAYS  
selection and press SELECT. MON-SUN allows every  
day to be set the same. MON-FRI allows for weekday  
programming while SAT-SUN will adjust weekends differ-  
ently. You also can select each day of the week individu-  
ally. NOTE: Even if you select MON-SUN, you still can  
go back and change individual days to suit your lifestyle.  
MON TO SUN  
MON TO FRI  
SAT TO SUN  
MONDAY  
MORE  
MAIN MENU  
SELECT  
MONDAY PROGRAM  
Use the UP or DOWN button to  
HEAT  
70ꢀ  
62ꢀ  
70ꢀ  
62ꢀ  
COOL  
78  
85  
78  
82  
select the event to program. You  
can choose 2, or 4 events per  
day. See USER SETTINGS for  
EVENTS PER DAY selection.  
After selecting the event to pro-  
gram, press SELECT.  
WAKEꢀ 06:30Aꢀ  
MORNꢀ 08:30Aꢀ  
04:30Pꢀ  
NIGHTꢀ 10:30Pꢀ  
EVEꢀ  
MAIN MENU  
SELECT  
Please go to the next page for a continued discussion on "How to program your thermostat."  
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How do I program my thermostat? (continued)  
MONDAY PROGRAM  
HEAT  
70ꢀ  
62ꢀ  
70ꢀ  
62ꢀ  
COOL  
78  
85  
78  
82  
WAKEꢀ 06:00Aꢀ  
MORNꢀ 08:30Aꢀ  
The time for the first event should be highlighted. Use the UP or DOWN key to change the time.  
Press SET TIME.  
EVEꢀ  
04:30Pꢀ  
NIGHTꢀ 10:30Pꢀ  
MAIN MENU  
SET TIME  
MONDAY PROGRAM  
HEAT  
70ꢀ  
62ꢀ  
70ꢀ  
62ꢀ  
COOL  
78  
85  
78  
82  
WAKEꢀ 06:30Aꢀ  
MORNꢀ 08:30Aꢀ  
The heating setpoint for the first event will be highlighted. Use the UP or  
DOWN key to change the desired temperature. Press SET HEAT.  
EVEꢀ  
04:30Pꢀ  
NIGHTꢀ 10:30Pꢀ  
MAIN MENU  
SET HEAT  
MONDAY PROGRAM  
HEAT  
70ꢀ  
62ꢀ  
70ꢀ  
62ꢀ  
COOL  
78  
85  
78  
82  
The cooling setpoint for the first event will  
be highlighted. Use the UP or DOWN key  
to change the desired temperature. Press  
SET COOL.  
WAKEꢀ 06:30Aꢀ  
MORNꢀ 08:30Aꢀ  
EVEꢀ  
04:30Pꢀ  
NIGHTꢀ 10:30Pꢀ  
MAIN MENU  
SET COOL  
MONDAY PROGRAM  
HEAT  
70ꢀ  
62ꢀ  
70ꢀ  
62ꢀ  
COOL  
78  
85  
78  
82  
The second event will now be highlighted.  
Use the UP or DOWN key to change events if  
desired. When the desired event is highlighted,  
press SELECT. Continue programming until all  
events are programmed.  
WAKEꢀ 06:30Aꢀ  
MORNꢀ 08:30Aꢀ  
EVEꢀ  
04:30Pꢀ  
NIGHTꢀ 10:30Pꢀ  
MAIN MENU  
SELECT  
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How do I copy one day’s program to another day?  
MONDAY PROGRAM  
HEAT  
COOL  
MORNꢀ 08:30Aꢀ  
EVEꢀ 04:30Pꢀ  
NIGHTꢀ 10:30Pꢀ  
COPY  
62ꢀ  
70ꢀ  
62ꢀ  
85  
78  
82  
In the program screen, press the DOWN button until COPY is highlighted.  
MAIN MENU  
SELECT  
COPY MONDAY TO  
Use the UP or DOWN button to highlight the  
day to copy to. Press YES / NO. A YES will  
appear next to the day. Do this for each day to  
which that program is to be copied. Press  
FINISHED when complete.  
TUESDAYꢀ  
WEDNESDAY  
THURSDAY  
FRIDAYꢀ  
YES  
YES  
FINISHED  
YES / NO  
CONTINUE  
PROGRAMMING?  
After pressing FINISHED, you can choose to pro-  
gram other days or exit. YES will take you back to  
the Select Program Days screen. NO will exit you  
to the main screen.  
NOꢀꢀ  
YES  
13  
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What is an event?  
An event is a programming period. This could be the period in the morning when you are preparing for work or school. It could be the  
period when no one is at home. It could be the period when the household is asleep at night.  
The time for an event is selected based on when you want the event to occur. For example, if you wake up at 6:30 AM, set the first  
event for 6:30 AM. The thermostat will automatically make sure that your home is at the desired temperature selected for that event  
by the time you wake.  
This thermostat can be set for 2 or 4 events.  
Two events should be selected if someone is home all day thereby requiring a constant temperature during the day and a different  
temperature at night.  
Four events are the most common for working households. Event 1 (WAKE) is the morning period. Event 2 (DAY) is when everybody  
has left for school or work. Event 3 (EVE) is the return period, coming home from school or work. Event 4 (NIGHT) is the night period  
when everybody is asleep.  
How do I know what program is right for me?  
®
The thermostat is factory set with the US EPA ENERGYSTAR recommended times and temperatures for optimal energy savings. You  
can change these to suit your lifestyle.  
The best rule is to examine your schedule and set the times and temperatures that best fit. This thermostat is so versatile, you can  
easily change temperatures or programs at a whim.  
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MENU  
PROGRAM  
HEAT/COOL  
HUMIDIFY MENU  
HUMIDIFY  
CONTROL  
%
How do I set the Humidify Levels?  
MODE  
HUMIDIFY  
OFF  
45%  
Humidification can occur only when the thermo-  
stat is in the HEAT mode. The humidify level is  
adjustable from 15% to 45% RH. From the Main  
Screen press MENU.  
HUMIDIFY  
45  
DEHUMIDIFY  
HUM MENU  
SELECT  
SELECT  
SELECT  
HOME  
MAIN MENU  
Use the UP or DOWN arrow to highlight  
HUMIDIFY. Use the UP or DOWN arrow to again highlight HUMIDIFY.  
Use the UP and DOWN arrow to adjust the Humidify level.  
MENU  
PROGRAM  
HEAT/COOL  
HUMIDIFY  
DEHUMIDIFY MENU  
How do I set the Dehumidify Levels?  
MODE  
DEHUMIDIFY  
HUMIDITROL  
45%  
Dehumidification can occur only when the thermostat is in the COOL mode.  
The dehumidify level is adjustable from 45% to 60% RH. From the Main  
Screen press MENU. Use the UP or DOWN arrow to highlight DEHUMIDIFY.  
Use the UP or DOWN arrow to again highlight DEHUMIDIFY. Use the UP  
and DOWN arrow to adjust the Dehumidify level.  
DEHUMIDIFY  
SELECT  
HOME  
SELECT  
MAIN MENU  
What is the difference between Basic and Precision modes?  
In the Basic mode, the humidifier will turn on only with a call for heat. If there is a need for dehumidifica-  
tion, this will occur only with a call for cooling.  
DEHUMIDIFY MODE  
OFF  
HUMIDITROL  
In the Precision mode, if the conditioned space requires humidification, the system will circulate air and  
turn on the humidifier to add moisture to the air regardless of whether there is a call for heat. If the condi-  
tioned space requires dehumidification, the air conditioner will turn on to reduce the humidity level to the  
desired setpoint regardless of whether there is a call for cooling.  
SELECT  
DEHUM MENU  
During dehumidification, it is possible to over-cool the conditioned space by up to 2°F to achieve desired  
humidity levels.  
DEHUMIDIFY  
CONTROL  
If the HUMIDITROL accessory is enabled in the Installer Settings, the Precision mode selection will  
appear as HUMIDITROL. This selection allows for the most effective use of the HUMIDITROL equipment.  
%
45  
DEHUM MENU  
SELECT  
15  
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What happens if the mode is set to OFF?  
The humidification and dehumidification are turned off. The thermostat will simply control to the  
temperature setpoint.  
What is the difference between Basic and Basic/DP  
(same as Precision and Precision/DP)?  
The DP stands for Dew Point. If the remote outdoor sensor (Part #46M98) is connected and Basic/DP or  
Precision/DP is selected, the thermostat will automatically optimize the indoor humidity level based on the  
desired indoor temperature and outdoor temperature. In Dew Point mode,the humidify control level  
(described on the previous page) is ignored.  
HUMIDIFY MODE  
BASIC  
PRECISION  
BASIC/DP  
PRECISION/DP  
SELECT  
HUM MENU  
If Basic/DP or Precision/DP is chosen, a new menu DEW POINT ADJUSTMENT will be displayed.  
DEW POINT ADJ  
CO0NTROL  
What is the Dew Point Adjustment Function?  
%
The Dew Point Adjustment can be set from -15% to +15%. These settings allow you to customize the  
Dew Point setting for your home. Some homes may require an adjustment to help maintain comfort. If you  
notice condensation on your windows, set the adjustment lower, between -15% to -5%. If your home feels  
dry, set the adjustment upwards, between +5 to +15%.  
HUM MENU  
SELECT  
HUMIDIFIER MAINTENANCE  
Can I change the Humidifier Maintenance Service Intervals?  
No. This interval is fixed based on the run time of your system and if the humidifier has been turned on.  
When the recommended service interval has expired, the screen to the right will appear. Simply press  
DELAY to be reminded later or RESET to reset the interval.  
LENNOX, INC.  
1-800-9LENNOX  
RESET  
DELAY  
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What are the USER settings?  
MONDAY  
3:29 PM  
COOL  
The USER SETTINGS can change the way information is displayed on the thermostat and help  
to optimize comfort. It’s one way to truly personalize your new thermostat.  
FAN AUTO  
78  
SET AT  
78  
HOLD TEMP  
MENU  
MENU  
BACK  
DEHUMIDIFY  
DAY / TIME  
FAN  
To get to the USER SETTINGS, press the MENU button from the main screen.  
MORE  
USER SETTINGS are below the FAN settings. Use the DOWN button to scroll below the  
screen. Press SELECT.  
USER SETTINGS  
HOME  
SELECT  
Choose the setting you would like to change. When the SETTING is highlighted, press SELECT. There are 10 USER  
SETTINGS in all as listed below. For detailed information on each user setting, please go to the next page.  
USER SETTINGS MENU  
F OR Cꢀ  
USER SETTINGS MENU  
USER SETTINGS MENU  
COOLING LIMITꢀ  
1ST STAGE DIFFꢀ  
2ND STAGE DIFFꢀ  
2ND DELAYꢀ  
1˚F  
2˚F  
˚F  
12  
68˚F  
78˚F  
OFF  
12 OR 24hrꢀ  
HEATING LIMITꢀ  
SECURITYꢀ  
20  
SHOW SET TEMPꢀ  
EVENTS / DAYꢀ  
YES  
4
COOLING LIMITꢀ  
45˚F  
MAIN MENU  
MAIN MENU  
SELECT  
SELECT  
SELECT  
MAIN MENU  
17  
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Detailed Information on the USER SETTINGS (Or what do these USER SETTINGS do?)  
To select a USER SETTING, use the UP or DOWN button to highlight the desired value. Press SELECT to select desired value.  
TEMPERATURE  
˚F  
TEMPERATURE: Fahrenheit or Celsius  
Temperature will be displayed in F or C.  
˚C  
USER MENU  
CLOCK  
SELECT  
12 HOUR  
24 HOUR  
CLOCK SETTINGS  
Displays time in standard 12-hour format or military format.  
USER MENU  
SELECT  
DISPLAY SET POINT  
TEMPERATURE ?  
SETPOINT TEMPERATURE  
Each event has a setpoint temperature. Choose whether to display this value or not.  
YES  
NO  
USER MENU  
SELECT  
SELECT EVENTS / DAY  
EVENTS / DAY 4  
NUMBER OF EVENTS PER DAY  
Select events per day. Choose from 2 or 4 events per day.  
0
6
12  
18  
SELECT  
24  
USER MENU  
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More Detailed Information on the USER SETTINGS  
DIFFERENTIAL SETTING  
DIFFERENTIAL SETTINGS  
The temperature differential is your comfort level. The differential is the difference from setpoint  
before your heating or cooling system will turn on. The 81M27 and 81M28 models also have 2nd  
stage differential. In the Heat mode, if the temperature falls below (or above for cooling) the set-  
point by the 1st stage differential plus the 2nd stage differential, the second stage of heating (or  
cooling) will turn on.  
1ST DIFFꢀꢀ  
1˚F  
2ND DIFFꢀꢀ  
2ND DELAYꢀꢀ  
2˚F  
20 MIN  
USER MENU  
SELECT  
The 2nd stage delay is a timed delay before the second stage will turn on if the setpoint has not  
been achieved within that time frame, and if the difference between the setpoint and the actual  
temperature is bigger than the first stage differential but smaller than the first stage differential  
plus the second stage differential.  
HEATING and COOLING LIMITS  
SET HEATING LIMIT  
SET COOLING LIMIT  
To prevent individuals (probably your kids) from adjusting the ther-  
mostat too hot or too cold, you can limit the maximum setting for the  
heating and cooling modes. This will help you save on  
energy costs.  
LOWEST COOLINGꢀ  
SETTING ALLOWED  
45 °F  
HIGHEST HEATINGꢀ  
SETTING ALLOWED  
90 °F  
USER MENU  
USER MENU  
SELECT  
SELECT  
19  
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More Detailed Information on the USER SETTINGS  
SECURITY  
SECURITY SETTINGS  
CHANGE TEMP. ONLY  
In order to prevent tampering with the program and your desired settings, two levels of security are  
available.The first will allow only temporary changes to the temperature. It protects all other pro-  
grammed setpoints. The second will restrict changes to EVERYTHING, including temporary  
changes to the temperature.  
PREVENT ALL CHANGES  
USER MENU  
SELECT  
ENTER SECURITY CODE  
FOR TEMPERATURE  
0 0 0 0  
SECURITY CODE  
In this screen you enter a four-digit code. Use the UP or DOWN button to change the first value,  
press SELECT. The second digit will be highlighted. Repeat for all four values. And don’t forget your  
code. If you do, you will have to reset the entire thermostat and that will erase all the schedules  
you’ve programmed into the unit.  
USER MENU  
SELECT  
NOTE: After entering the security code to unlock the thermostat, the code will need to be re-entered  
to secure the thermostat after changes are made.  
When would I need to change the USER settings?  
About the only features you may need to change are the temperature differentials (if you desire additional comfort) and the security settings.  
All the other settings probably will not need to be changed.  
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What are the INSTALLER settings?  
The INSTALLER SETTINGS are setup during the initial installation. They tell the thermostat how to function with your heating or  
cooling equipment. The following is a brief overview and discussion of these settings.  
INSTALLER SETTINGS  
SYSTEM SETUPꢀ GAS  
INSTALLER SETTINGS  
SECURITYꢀ  
INSTALLER SETTINGS  
CONTACT INFO  
INSTALLER SETTINGS  
OFF  
RUN  
AUTOCHANGEOVERꢀ  
EERꢀꢀ  
ON  
ON  
RESIDUAL COOLꢀ  
LOW BALANCEꢀ  
HIGH BALANCEꢀ  
60  
CONTACT INFO  
SERVICE INT  
REMINDERꢀ  
SERVICE INT  
REMINDERꢀ  
DEADBANDꢀꢀ  
HUMIDITROLꢀ  
3˚F  
45˚F  
95˚F  
RUN  
*
OFF  
TEMP OFFSETꢀ  
0.0°F  
MAIN MENU  
MAIN MENU  
HOME  
SELECT  
SELECT  
SELECT  
HOME  
SELECT  
* DEADBAND is displayed only  
when AUTOCHANGEOVER is ON.  
SYSTEM SETUP  
FURNACE  
SYSTEM SETUP  
Choose the system component that the thermostat will control.  
With the 81M26, either a furnace or a single-stage heat pump (with no auxiliary heat)  
can be used. If FURNACE is selected, then either a GAS/OIL or ELECTRIC furnace  
can be used.  
HEAT PUMP  
INSTALL MENU  
SELECT  
1st STAGE HEATING  
With the 81M27, either a GAS/OIL or ELECTRIC furnace can be used.  
1ST STAGE HEATING  
GAS / OIL  
ELECTRIC  
INSTALL MENU  
SELECT  
21  
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INSTALLER settings (continued)  
AUXILIARY HEAT  
AUXILIARY HEAT  
With the 81M28, either an electric or gas heat source can be used as an auxiliary backup to the  
heat pump. Choose STANDARD-COMP=ON if an electric backup source is to be used. Choose  
ADD ON-COMP=OFF is a gas backup source is to be used.  
STANDARD - COMP. =ON  
ADD ON - COMP. =OFF  
INSTALL MENU  
SELECT  
RESIDUAL COOL  
RESIDUAL COOL  
In order to get greater efficiency from the cooling system, the fan can be programmed to run for  
0 (OFF), 30, 60, 90, or 120 seconds after the air conditioner has shut off. Residual cool may  
interfere with proper system operation. Consult the system operating manual.  
SECONDS DELAYꢀ  
INSTALL MENU  
60  
SELECT  
BALANCE POINTS  
BALANCE POINTS  
This screen will appear only when the outdoor sensor (Part #46M98) is connected to the 81M28  
thermostat. When this sensor is used with the 81M28, you can set the lower and upper  
temperatures to disable or enable 2nd stage heat.  
LOW BALANCEꢀ  
HIGH BALANCEꢀ  
45 ˚F  
95 ˚F  
At outdoor temperatures above the high balance point, only the heat pump is allowed to run. At  
outdoor temperatures below the low balance point, only the auxiliary heat source is allowed to run.  
At outdoor temperatures between the high and low balance points, both the heat pump and the  
auxiliary heat source are allowed to run.  
INSTALL MENU  
SELECT  
AUTO CHANGEOVER  
AUTO CHANGEOVER  
DISABLEꢀ  
ENABLE  
When turned on, the thermostat will switch automatically between heating and cooling to maintain  
the optimal temperature in your home.  
When Auto Changeover is enabled in Installer Settings, it will also appear in the HEAT/COOL  
menu described earlier. Auto Changeover must be enabled in both places in order to function.  
INSTALL MENU  
SELECT  
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INSTALLER settings (continued)  
ENERGY EFFICIENT RECOVERY  
ENERGY EFFICIENT  
RECOVERY  
When turned on, the thermostat will look up to two hours before the next event and anticipate when  
to turn on to reach the desired temperature.  
DISABLE  
ENABLE  
NOTE: This will not allow the second stage to turn on until 20 minutes before the event.  
USER MENU  
SELECT  
DEADBAND SETPOINT  
DEADBAND SETPOINT  
3 ˚F  
Deadband is used only when the AUTO CHANGEOVER feature is enabled. The deadband is the  
temperature difference between the heating and cooling setpoints. This is adjustable from 3-8°F  
(2.0-4°C).  
USER MENU  
SELECT  
HUMIDITROL  
HUMIDITROL  
If the HUMIDITROL accessory is present in the HVAC equipment, this feature should be enabled.  
Otherwise, it should be disabled.  
DISABLE  
ENABLE  
INSTALL MENU  
SELECT  
SECURITY CODE  
Enter a code to prevent changes to the INSTALLER settings.  
ENTER SECURITY CODE  
FOR INSTALLER  
SETTINGS  
0 0 0 0  
USER MENU  
SELECT  
23  
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INSTALLER settings (continued)  
CONTACT INFORMATION  
CONTACT INFORMATION  
This allows the servicing HVAC contractor to put their name and phone number into the thermostat to remind  
you when service may be required.  
AIR EXPERTS  
1-555-555-1212  
SERVICE MONITOR MENU  
Different service monitors are provided, depending on which model you have. The filter monitor is provided on  
all models. On the 81M26 and 81M27, the heat monitor and cool monitor is also provided. On the 81M28, the  
system monitor is provided. All monitors can be set based on the HVAC system run time or the calendar. See  
Reminder Interval.  
All Service Monitors can be set from OFF to 360 days in 30 day increments or OFF to 980 in 20  
hour increments.  
EDIT  
BACK  
SERVICE MONITOR MENU  
SERVICE MONITOR 980  
FILTER MONITOR 980  
SELECT  
INSTALL MENU  
REMINDER PERIOD  
The Reminder Period can be set for either HVAC system run time or based on the calendar.  
REMINDER PERIOD  
If Run Time is chosen, the service reminder will be set in hours. After the HVAC system has been operating  
for the selected number of hours, a Service Reminder will be displayed informing you that service is  
suggested for your system.  
RUN TIME  
CALENDAR TIME  
If Calendar Time is chosen, the service reminders will be set in days. After the selected number of days has  
passed, a Service Reminder will be displayed informing you that service is suggested for your system.  
SELECT  
INSTALL MENU  
TEMPERATURE OFFSET  
TEMPERATURE OFFSET  
The temperature offset feature adds or subtracts the desired amount from the displayed room temperature  
reading. For example, if the displayed room temperature is 75 and, for some reason, you want it to read 73,  
simply enter a value of -2 for the temperature offset.  
0.0 ˚F  
The temperature offset is selectable from -3 to +3 degrees.  
INSTALL MENU  
SELECT  
When would I need to change the INSTALLER settings?  
NEVER! The INSTALLER SETTINGS are selected based on the type of equipment you have in your home. This feature should be set  
only by a certified HVAC technician. Changing these settings could result in higher energy costs and may even damage your equipment.  
There is a security lock on this feature to prevent tampering. USE IT!  
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How does Energy Efficient Recovery™ (EER™) work?  
Energy Efficient Recovery™ is an energy saving feature. During a set back period (or set up in cooling), it allows the thermostat to  
look up to two hours ahead to determine when to turn on the heating (cooling) system. During this time period, the second stage is  
locked out until 20 minutes before the next programmed event to allow the first (and most efficient stage) to bring your home to the  
desired temperature.  
How does my remote outdoor sensor work?  
The remote outdoor sensor (Part #46M98) can be used to aid in the comfort of your home or simply as a sensing device to inquire  
about outdoor conditions. In most applications, the thermostat will have a display of the temperature sensed by the remote outdoor  
sensor. With your heat pump system, the remote outdoor sensor can help determine when to turn on the second stage of heating for  
optimal comfort.  
Where should I install a remote outdoor sensor?  
The remote outdoor sensor should be installed on the northern wall of your home, away from direct sunlight or other heat sources that  
may affect its sensitivity.  
NOTE: Use twisted pair wire (84X49) for the installation of the outdoor sensor.  
What do the lights below the display mean?  
The lights indicate different operations of the HVAC equipment.  
With a call for heating or cooling, the HEAT or COOL light will be illuminated on the 81M26 and 81M27.  
The AUX light indicates the second (backup) stage of heating. This is used only on the 81M28 model.  
The CHECK light is used on all models. It indicates the equipment should be serviced by a qualified technician.  
The EMER light indicates that the emergency heat is enabled in the HEAT/COOL menu (regardless of heat demand). This light is used  
only on the 81M28 model.  
25  
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26  
What should I do if my power goes out?  
Make sure your family is safe and don’t worry about the thermostat. Your thermostat automatically retains the time of day for approxi-  
mately two hours in the event of a power outage. All other programmed parameters are stored permanently in memory. So, if your  
power is out for more than two hours, simply reset the clock. See page 4.  
How do I reset the thermostat program to factory conditions?  
To reset the thermostat to factory conditions, press the UP button and the LEFT button at the same time. Hold for 8 seconds. The time  
of day will display 12:00 indicating a reset has occurred.  
NOTE: This will erase all programming and return the thermostat to the factory conditions (including the installer settings) along  
with erasing current security codes. Use this only as a last resort.  
How do I know if the heating or cooling is on?  
The display of the thermostat will indicate the operating mode, HEAT or COOL. When the temperature in your home decreases or  
increases, the heating or cooling cycle will come on based on the displayed mode. Also, lights along the bottom crease of the thermo-  
stat will indicate various equipment operations.  
Who do I contact for more information?  
Simply call 1-800-9LENNOX or visit us on the web at www.lennox.com.  
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My energy bills are too high. Is there anything I can do?  
While we can’t do anything about the high cost of energy, we can try to use less energy and thereby lower our heating and  
cooling costs.  
®
Generally, the best way to do this is to use the EPA ENERGYSTAR recommended setpoints for heating and cooling.  
®
ENERGYSTAR Setpoints  
Winter  
(Heating)  
Summer  
(Cooling)  
Morning 70°F (21°C) 78°F (25°C)  
Day 62°F (17°C) 85°F (29°C)  
Evening 70°F (21°C) 78°F (25°C)  
Night 62°F (17°C) 82°F (28°C)  
Another way to contain costs is to cycle the heat pump or air conditioner with moderation. The thermostat controls the cycle rate  
based on temperature differentials. By maintaining a reasonable differential setting, 1°F for 1st stage and 2°F for 2nd stage,  
your furnace will cycle with moderation.  
Finally, using the remote outdoor sensor coupled with the balance point feature (see INSTALLER SETTINGS, page 22) will  
allow your furnace to cycle to the most efficient stage for your heating or cooling needs.  
27  
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110-1052F  
504, 684M  
www.lennox.com  

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