Lennox 81M28, 81M27, 81M26 User 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
Five Year Warranty
User's Manual
504, 684M
110-1052F
DELUXE
PROGRAMMABLE
THERMOSTATS
with Humidity Control
81M26
81M27
81M28
110-1052F 5/12/05 11:59 AM Page 1
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 damaged.
• Do not switch system to cool if the temperature is below 45°F (7°C). This can damage the cooling system and may cause personal injury.
• Use this thermostat only as described in this manual.
2
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110-1052F 5/12/05 11:59 AM Page 2
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
3
110-1052F 5/12/05 11:59 AM Page 3
4
How do I change the time of day and day of the week?
From the main screen press MENU.
Use the UP or DOWN arrows to highlight DAY/TIME.
Press SELECT.
Use the UP or DOWN arrow to highlight DAY, HOUR
or MINUTES. Press SET.
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.
MONDAY 3:29 PM
78
HOLD TEMP MENU
COOL
FAN AUTO
SET AT
78
MENU
DAY / TIME
FAN
USER SETTINGS
INSTALLER SETTINGS
HOME
SELECT
BACK
MAIN MENU
SET
MINUTES
SET DAY & TIME
HOUR
DAY
FRIDAY
12 PM
06
MAIN MENU
SET
MINUTES
SET DAY & TIME
HOUR
FRIDAY
12 PM
31
DAY
110-1052F 5/12/05 11:59 AM Page 4
How do I turn on the heating or cooling cycles?
From the main screen press MENU.
Use the UP or DOWN arrows to highlight HEAT/COOL.
Press SELECT.
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.
NOTE: Emergency heat is used only on the 81M28 model.
It should only be used if the primary stage of heating
cannot maintain the temperature of the conditioned space.
(AUTO CHANGEOVER will appear in the menu only if it is
enabled in Installer Settings.)
5
MONDAY 3:29 PM
78
HOLD TEMP MENU
COOL
FAN AUTO
SET AT
78
MENU
DAY / TIME
HEAT / COOL
PROGRAM
FAN
HOME
SELECT
MORE
HEAT / COOL SETTINGS
MAIN MENU
SELECT
HEAT
COOL
AUTO CHANGEOVER
EMERGENCY HEAT
HEAT / COOL SETTINGS
MAIN MENU
SELECT
HEAT
COOL
AUTO CHANGEOVER
EMERGENCY HEAT
110-1052F 5/12/05 11:59 AM Page 5
How do I cycle the fan?
From the main screen press MENU.
Use the UP or DOWN buttons until FAN is highlighted. Press SELECT.
Use the UP or DOWN buttons to highlight FAN settings.
Press SELECT.
How does INTERMITTENT FAN work?
INTERMITTENT will turn the fan on for a set period of time for a
given interval when the heating or cooling equipment is idle.
The thermostat will cycle the fan on for the set ON cycle. The fan will remain off for the set OFF cycle.
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.
6
MONDAY 3:29 PM
78
HOLD TEMP MENU
COOL
FAN AUTO
SET AT
78
MENU
DAY / TIME
HEAT / COOL
PROGRAM
FAN
HOME
SELECT
MORE
MAIN MENU
SELECT
FAN MENU
FAN SETTINGS
FAN PROGRAM
FAN MENU
SELECT
ON TIME 5 MIN
INTERMITTENT FAN
OFF TIME 20 MIN
MAIN MENU
SELECT
FAN SETTINGS
ON
AUTO
INTERMITTENT
Three choices are available:
ON will turn the fan on continuously.
AUTO will turn the fan on only
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.
110-1052F 5/12/05 11:59 AM Page 6
How do I temporarily change the temperature?
From the main screen, press the UP or DOWN button. The screen
will change to the following.
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.
NOTE: Temporary temperature changes override
the Auto Changeover function.
7
MONDAY 3:29 PM
78
HOLD TEMP MENU
COOL
FAN AUTO
SET AT
78
SET TEMPERATURE AT
HOME
SET TEMP
70 ˚
F
UNTIL 6:29 PM
MENU
COOL
FAN AUTO
SET AT 70°F UNTIL 6:29 PM
70˚
F
RESUME
PROGRAM
OUTSIDE 24
˚F
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.
110-1052F 5/12/05 11:59 AM Page 7
8
Can I set a temporary adjustment for longer than 3 hours?
Yes you can! Press the HOLD TEMP button. The following screen appears.
Press the DOWN button to highlight TEMPORARY HOLD. Press SELECT.
The temperature should be highlighted.
Press the UP or DOWN button to adjust
the temperature. Press SET TEMP.
The time should be highlighted. Press the UP or
DOWN button to adjust the time. Press SET TIME.
The main screen will now indicate a TEMPORARY HOLD until the
desired time. Press RESUME PROGRAM to return to the program
operating mode.
MONDAY 3:29 PM
78
HOLD TEMP MENU
COOL
FAN AUTO
SET AT
78
HOME
SELECT
HOLD SETTINGS
PERMANENT HOLD
TEMPORARY HOLD
VACATION HOLD
TEMPORARILY AT
HOME
SET TEMP
70 ˚
F
UNTIL 3:49 PM
TEMPORARILY AT
HOME
SET TIME
70 ˚
F
UNTIL 3:49 PM
MENU
COOL
FAN AUTO
SET AT 70°F UNTIL 8:29 PM
77
°
F
RESUME
PROGRAM
110-1052F 5/12/05 11:59 AM Page 8
Can I set the thermostat to hold one temperature indefinitely?
You can do that too! From the main screen press the HOLD TEMP button. The following screen appears.
The PERMANENT HOLD feature should be highlighted. If it is not, use
the UP or DOWN arrow to highlight it. Press SELECT.
Use the UP or DOWN arrow to set the temperature to
the desired level. Press SET TEMP.
How do I return to the Program Mode after being in HOLD?
Simply press the RESUME PROGRAM button. This works from all HOLD screens.
9
MONDAY 3:29 PM
78
HOLD TEMP MENU
COOL
FAN AUTO
SET AT
78
HOME
SELECT
HOLD SETTINGS
PERMANENT HOLD
TEMPORARY HOLD
VACATION HOLD
PERMANENTLY AT
HOME
SET TEMP
70 ˚
F
MENU
COOL
FAN AUTO
PERMANENTLY SET AT 71°F
70 ˚
F
RESUME
PROGRAM
OUTSIDE 24
˚F
MENU
COOL
FAN AUTO
PERMANENTLY SET AT 71°F
70 ˚
F
RESUME
PROGRAM
OUTSIDE 24
˚F
The main screen will now
indicate a PERMANENT
HOLD. Press RESUME
PROGRAM to return to the
program operating mode.
110-1052F 5/12/05 11:59 AM Page 9
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