• 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.
110-1052F 5/12/05 11:59 AM Page 4 How do I change the time of day and day of the week? MONDAY 3:29 PM COOL FAN AUTO SET AT HOLD TEMP MENU DAY / TIME USER SETTINGS INSTALLER SETTINGS HOME Use the UP or DOWN arrow to highlight DAY, HOUR or MINUTES.
110-1052F 5/12/05 11:59 AM Page 5 How do I turn on the heating or cooling cycles? MONDAY 3:29 PM COOL FAN AUTO SET AT HOLD TEMP MENU PROGRAM HEAT / COOL DAY / TIME Use the UP or DOWN arrows to highlight HEAT, COOL or AUTO CHANGEOVER.
TIME 5 MIN The thermostat will cycle the fan on for the set ON cycle. The fan will remain off for the set OFF cycle. TIME 20 MIN If the HVAC system runs for a longer period than the ON cycle, the OFF cycle will start counting over...
110-1052F 5/12/05 11:59 AM Page 7 How do I temporarily change the temperature? MONDAY 3:29 PM COOL FAN AUTO SET AT HOLD TEMP MENU SET TEMPERATURE AT 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.
110-1052F 5/12/05 11:59 AM Page 8 Can I set a temporary adjustment for longer than 3 hours? MONDAY 3:29 PM COOL FAN AUTO SET AT HOLD TEMP MENU HOLD SETTINGS PERMANENT HOLD TEMPORARY HOLD VACATION HOLD HOME The time should be highlighted. Press the UP or DOWN button to adjust the time.
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...
110-1052F 5/12/05 11:59 AM Page 10 How do I set the Vacation Mode? MONDAY 3:29 PM Take a trip and don’t worry about the temperature! From the main screen press the HOLD TEMP COOL FAN AUTO button. The following screen appears. SET AT HOLD TEMP MENU...
PROGRAM HEAT / COOL DAY / TIME HOME Please go to the next page for a continued discussion on "How to program your thermostat." Use the UP or DOWN button to highlight PROGRAM. Press SELECT. MORE SELECT You can select a variety of programming. Make your SELECT PROGRAM DAYS selection and press SELECT.
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110-1052F 5/12/05 11:59 AM Page 12 How do I program my thermostat? (continued) MONDAY PROGRAM HEAT COOL WAKE 06:00A MORN 08:30A 04:30P NIGHT 10:30P MAIN MENU SET TIME MONDAY PROGRAM WAKE MORN NIGHT MAIN MENU The time for the first event should be highlighted. Use the UP or DOWN key to change the time.
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 MORN 08:30A 04:30P NIGHT 10:30P COPY MAIN MENU SELECT In the program screen, press the DOWN button until COPY is highlighted. COPY MONDAY TO TUESDAY WEDNESDAY...
NERGY 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.
Use the UP and DOWN arrow to adjust the Humidify level. How do I set the Dehumidify Levels? 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.
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.
SELECT MAIN 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. To get to the USER SETTINGS, press the MENU button from the main screen.
110-1052F 5/12/05 11:59 AM Page 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 ˚F ˚C...
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110-1052F 5/12/05 11:59 AM Page 19 More Detailed Information on the USER SETTINGS DIFFERENTIAL SETTING 1ST DIFF 1˚F 2ND DIFF 2˚F 2ND DELAY 20 MIN USER MENU SELECT SET COOLING LIMIT LOWEST COOLING °F HIGHEST HEATING SETTING ALLOWED SETTING ALLOWED USER MENU SELECT USER MENU...
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.
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.
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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.
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Page 23 INSTALLER settings (continued) ENERGY EFFICIENT RECOVERY ENERGY EFFICIENT When turned on, the thermostat will look up to two hours before the next event and anticipate when RECOVERY to turn on to reach the desired temperature. DISABLE NOTE: This will not allow the second stage to turn on until 20 minutes before the event.
EDIT 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 SERVICE MONITOR MENU Reminder Interval.
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.
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.
Generally, the best way to do this is to use the EPA E 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.