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Lennox International Inc. 81M26 - page 1
Menu Driven Display Fully Programmable 24 V AC with W orry-Free Memory Storage 1 Heat / 1 Cool, 2 Heat / 2 Cool and Heat Pump Models Five Y ear Warranty User's Man ual 504, 684M 110-1052F DELUXE PROGRAMMABLE THERMOST A TS with Humidity Control 81M26 81M27 81M28 110-1052F 5/12/05 11:59 AM Page 1 ...
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Lennox International Inc. 81M26 - page 2
IMPORT ANT S AFETY INFORMA TION W ARNING: • DO NO T USE WITH COMMERCIAL EQ UIPMENT . • Always turn of f power at the main power source by unscrewing fuse or switc hing 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. ? ...
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Lennox International Inc. 81M26 - page 3
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? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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Lennox International Inc. 81M26 - page 4
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 DA Y/TIME. Press SELECT . Use the UP or DOWN arrow to highlight DA Y , 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 ...
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Lennox International Inc. 81M26 - page 5
How do I turn on the heating or cooling cycles? From the main screen press MENU. Use the UP or DOWN arrows to highlight HEA T/COOL. Press SELECT . Use the UP or DOWN arrows to highlight HEA T , COOL or AUTO CHANGEOVER. Press SELECT . The SELECT button will turn on or off the desired cycle. Y ou do not have to turn off HEA T to turn on COOL. When HE ...
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Lennox International Inc. 81M26 - page 6
How do I cycle the fan? From the main screen press MENU. Use the UP or DOWN buttons until F AN is highlighted. Press SELECT . Use the UP or DOWN buttons to highlight F AN 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 i ...
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Lennox International Inc. 81M26 - page 7
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: T emporary tempera ...
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Lennox International Inc. 81M26 - page 8
8 Can I set a temporary adjustment for longer than 3 hours? Y es you can! Press the HOLD TEMP button. The following screen appears. Press the DOWN button to highlight TEMPORAR Y 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 th ...
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Lennox International Inc. 81M26 - page 9
Can I set the thermostat to hold one temperature indefinitely? Y ou 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 le ...
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Lennox International Inc. 81M26 - page 10
How do I set the Vacation Mode? T ake a trip and don’t worry about the temperature! From the main screen press the HOLD TEMP button. The following screen appears. Use the UP or DOWN arrow to highlight the V ACA TION HOLD feature. Press SELECT . The temperature should be highlighted. Use the UP or DOWN arrow to change to the desired temperature. P ...
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Lennox International Inc. 81M26 - page 11
How do I program my thermostat? From the main screen press the MENU button. Use the UP or DOWN button to highlight PROGRAM. Press SELECT . Y ou can select a variety of programming. Make your selection and press SELECT . MON-SUN allows every day to be set the same. MON-FRI allows for weekday programming while SA T -SUN will adjust weekends differ- e ...
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Lennox International Inc. 81M26 - page 12
12 How do I program my thermostat? (continued) The time for the first event should be highlighted. Use the UP or DOWN key to change the time. Press SET TIME. The heating setpoint for the first event will be highlighted. Use the UP or DOWN key to change the desired temperature. Press SET HEA T . The second event will now be highlighted. Use the UP o ...
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Lennox International Inc. 81M26 - page 13
How do I copy one day’s program to another day? In the program screen, press the DOWN button until COPY is highlighted. 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. After pressing FINISHED, yo ...
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Lennox International Inc. 81M26 - 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 ...
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Lennox International Inc. 81M26 - page 15
How do I set the Humidify Levels? Humidification can occur only when the thermo- stat is in the HEA T mode. The humidify level is adjustable from 15% to 45% RH. From the Main Screen press 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 lev ...
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Lennox International Inc. 81M26 - page 16
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 P ...
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Lennox International Inc. 81M26 - page 17
What are the USER settings? 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. T o get to the USER SETTINGS, press the MENU button from the main screen. USER SETTINGS are below the F AN settings. Use the DOWN button to scroll below th ...
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Lennox International Inc. 81M26 - page 18
18 Detailed Information on the USER SETTINGS (Or what do these USER SETTINGS do?) T o select a USER SETTING, use the UP or DOWN button to highlight the desired value. Press SELECT to select desired value. TEMPERA TURE: Fahrenheit or Celsius T emperature will be displayed in F or C. CLOCK SETTINGS Displays time in standard 12-hour format or military ...
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Lennox International Inc. 81M26 - page 19
More Detailed Information on the USER SETTINGS DIFFERENTIAL SETTINGS The temperature differential is your comfort level. The dif ferential is the difference from setpoint before your heating or cooling system will turn on. The 81M27 and 81M28 models also have 2 nd stage differential. In the Heat mode, if the temperature falls below (or above for co ...
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Lennox International Inc. 81M26 - page 20
20 More Detailed Information on the USER SETTINGS SECURITY SETTINGS 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 EVER YTHING, including te ...
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Lennox International Inc. 81M26 - page 21
What are the INSTALLER settings? The INST ALLER 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. SYSTEM SETUP Choose the system component that the thermostat will control. With the 81M26, either a f ...
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Lennox International Inc. 81M26 - page 22
INSTALLER settings (continued) AUXILIARY HEA T With the 81M28, either an electric or gas heat source can be used as an auxiliary backup to the heat pump. Choose ST ANDARD-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. RESIDUAL COOL In order to get greater efficiency from the cooling ...
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Lennox International Inc. 81M26 - page 23
INSTALLER settings (continued) 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. NOTE: This will not allow the second stage to turn on until 20 minutes before the event. DEADBAND SETPOINT Deadband is used only when the AUTO CHANGE ...
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Lennox International Inc. 81M26 - page 24
INSTALLER settings (continued) CONT ACT INFORMA TION This allows the servicing HV AC contractor to put their name and phone number into the thermostat to remind you when service may be required. SERVICE MONIT OR MENU Different service monitors are provided, depending on which model you have. The filter monitor is provided on all models. On the 81M2 ...
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Lennox International Inc. 81M26 - page 25
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 bef ...
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Lennox International Inc. 81M26 - page 26
26 What should I do if my power goes out? Make sure your family is safe and don’t worry about the thermostat. Y our 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, simp ...
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Lennox International Inc. 81M26 - page 27
27 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 EP A E NERGY S TA R ® recommended setpoints for heating and cooling. E NERGY S TA R ® Setpoints W ...
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Lennox International Inc. 81M26 - page 28
28 110-1052F 504, 684M www .lennox.com 110-1052F 5/12/05 11:59 AM Page 28 ...
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