110-1052F 5/12/05 11:59 AM Page 1
81M26ꢀ
DELUXE
PROGRAMMABLE
THERMOSTATS
ꢀ
ꢀ
ꢀ
81M27ꢀ
with Humidity Control
81M28
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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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
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110-1052F 5/12/05 11:59 AM Page 4
4
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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110-1052F 5/12/05 11:59 AM Page 5
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
5
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110-1052F 5/12/05 11:59 AM Page 6
6
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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110-1052F 5/12/05 11:59 AM Page 7
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.
7
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110-1052F 5/12/05 11:59 AM Page 8
8
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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110-1052F 5/12/05 11:59 AM Page 9
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
9
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110-1052F 5/12/05 11:59 AM Page 10
10
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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110-1052F 5/12/05 11:59 AM Page 11
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."
11
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110-1052F 5/12/05 11:59 AM Page 12
12
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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110-1052F 5/12/05 11:59 AM Page 13
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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110-1052F 5/12/05 11:59 AM Page 14
14
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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110-1052F 5/12/05 11:59 AM Page 15
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
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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
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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
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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
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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
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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.
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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?
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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.
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