10-1052F 5/12/05 11:59 AM Page 1 81M26 81M27 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
110-1052F 5/12/05 11:59 AM Page 2 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.
110-1052F 5/12/05 11:59 AM 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? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 5 How do I cycle the fan? . . . . . . . . . . . .
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 78 COOL FAN AUTO HOLD TEMP MENU From the main screen press MENU. SET AT 78 MENU BACK DAY / TIME FAN USER SETTINGS INSTALLER SETTINGS HOME Use the UP or DOWN arrows to highlight DAY/TIME. Press SELECT. SELECT Use the UP or DOWN arrow to highlight DAY, HOUR or MINUTES. Press SET.
110-1052F 5/12/05 11:59 AM Page 5 How do I turn on the heating or cooling cycles? MONDAY 3:29 PM 78 COOL FAN AUTO HOLD TEMP MENU From the main screen press MENU. SET AT 78 MENU PROGRAM Use the UP or DOWN arrows to highlight HEAT/COOL. Press SELECT. HEAT / COOL DAY / TIME FAN HOME MORE 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.
110-1052F 5/12/05 11:59 AM Page 6 6 How do I cycle the fan? MONDAY 3:29 PM 78 COOL FAN AUTO HOLD TEMP MENU From the main screen press MENU. SET AT 78 MENU Use the UP or DOWN buttons until FAN is highlighted. Press SELECT. PROGRAM HEAT / COOL DAY / TIME FAN 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.
110-1052F 5/12/05 11:59 AM Page 7 How do I temporarily change the temperature? MONDAY 3:29 PM 78 COOL FAN AUTO HOLD TEMP MENU SET AT 78 From the main screen, press the UP or DOWN button. The screen will change to the following. 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.
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 78 COOL FAN AUTO HOLD TEMP MENU Yes you can! Press the HOLD TEMP button. The following screen appears. SET AT 78 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. Press the UP or DOWN button to adjust the temperature. Press SET TEMP.
110-1052F 5/12/05 11:59 AM Page 9 Can I set the thermostat to hold one temperature indefinitely? MONDAY 3:29 PM 78 COOL FAN AUTO HOLD TEMP MENU You can do that too! From the main screen press the HOLD TEMP button. The following screen appears. SET AT 78 HOLD SETTINGS The PERMANENT HOLD feature should be highlighted. If it is not, use the UP or DOWN arrow to highlight it. Press SELECT.
110-1052F 5/12/05 11:59 AM Page 10 10 How do I set the Vacation Mode? MONDAY 3:29 PM 78 COOL FAN AUTO HOLD TEMP MENU Take a trip and don’t worry about the temperature! From the main screen press the HOLD TEMP button. The following screen appears. SET AT 78 HOLD SETTINGS Use the UP or DOWN arrow to highlight the VACATION HOLD feature. Press SELECT. PERMANENT HOLD TEMPORARY HOLD VACATION HOLD HOME SELECT VACATION SETTING The temperature should be highlighted.
0-1052F 5/12/05 11:59 AM Page 11 How do I program my thermostat? MONDAY 3:29 PM 78 COOL FAN AUTO HOLD TEMP MENU SET AT 78 From the main screen press the MENU button. MENU PROGRAM Use the UP or DOWN button to highlight PROGRAM. Press SELECT. HEAT / COOL DAY / TIME FAN HOME MORE SELECT SELECT PROGRAM DAYS MON TO SUN MON TO FRI SAT TO SUN MONDAY MAIN MENU MORE SELECT You can select a variety of programming. Make your selection and press SELECT. MON-SUN allows every day to be set the same.
110-1052F 5/12/05 11:59 AM Page 12 12 How do I program my thermostat? (continued) MONDAY PROGRAM WAKE MORN EVE NIGHT 06:00A 08:30A 04:30P 10:30P MAIN MENU HEAT COOL 70 62 70 62 78 85 78 82 The time for the first event should be highlighted. Use the UP or DOWN key to change the time. Press SET TIME.
110-1052F 5/12/05 11:59 AM Page 13 How do I copy one day’s program to another day? MONDAY PROGRAM MORN EVE NIGHT COPY 08:30A 04:30P 10:30P MAIN MENU HEAT COOL 62 70 62 85 78 82 In the program screen, press the DOWN button until COPY is highlighted. SELECT COPY MONDAY TO TUESDAY WEDNESDAY THURSDAY FRIDAY FINISHED YES YES Use the UP or DOWN button to highlight the day to copy to. Press YES / NO. A YES will appear next to the day.
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.
110-1052F 5/12/05 11:59 AM Page 15 How do I set the Humidify Levels? MENU PROGRAM HEAT/COOL Humidification can occur only when the thermostat is in the HEAT mode. The humidify level is HUMIDIFY adjustable from 15% to 45% RH. From the Main DEHUMIDIFY Screen press MENU. SELECT HOME 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.
110-1052F 5/12/05 11:59 AM Page 16 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.
110-1052F 5/12/05 11:59 AM Page 17 What are the USER settings? MONDAY 3:29 PM 78 COOL FAN AUTO HOLD TEMP MENU 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. SET AT 78 MENU DEHUMIDIFY DAY / TIME FAN BACK USER SETTINGS MORE HOME SELECT To get to the USER SETTINGS, press the MENU button from the main screen. USER SETTINGS are below the FAN settings.
110-1052F 5/12/05 11:59 AM Page 18 18 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 TEMPERATURE: Fahrenheit or Celsius Temperature will be displayed in F or C. ˚F ˚C USER MENU SELECT CLOCK CLOCK SETTINGS Displays time in standard 12-hour format or military format.
110-1052F 5/12/05 11:59 AM Page 19 More Detailed Information on the USER SETTINGS DIFFERENTIAL SETTING 1ST DIFF 2ND DIFF 2ND DELAY USER MENU 1˚F 2˚F 20 MIN SELECT 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.
110-1052F 5/12/05 11:59 AM Page 20 20 More Detailed Information on the USER SETTINGS SECURITY CHANGE TEMP. ONLY PREVENT ALL CHANGES USER MENU SELECT ENTER SECURITY CODE FOR TEMPERATURE 0 0 0 0 USER MENU SELECT 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 programmed setpoints.
110-1052F 5/12/05 11:59 AM Page 21 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.
110-1052F 5/12/05 11:59 AM Page 22 22 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.
110-1052F 5/12/05 11:59 AM Page 23 INSTALLER settings (continued) ENERGY EFFICIENT RECOVERY DISABLE ENABLE USER MENU 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.
110-1052F 5/12/05 11:59 AM Page 24 24 INSTALLER settings (continued) CONTACT INFORMATION AIR EXPERTS 1-555-555-1212 EDIT BACK SERVICE MONITOR MENU SERVICE MONITOR 980 FILTER MONITOR 980 INSTALL MENU SELECT REMINDER PERIOD RUN TIME CALENDAR TIME INSTALL MENU SELECT TEMPERATURE OFFSET 0.0 ˚F INSTALL MENU SELECT 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.
110-1052F 5/12/05 11:59 AM 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 before the next programmed event to allow the first (and most efficient stage) to bring your home to the desired temperature.
110-1052F 5/12/05 11:59 AM 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. Your thermostat automatically retains the time of day for approximately 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.
110-1052F 5/12/05 11:59 AM Page 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 EPA ENERGYSTAR® recommended setpoints for heating and cooling.
110-1052F 5/12/05 11:59 AM Page 28 28 www.lennox.
