Honeywell T8624 Owner's Manual
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Honeywell T8624 Owner's Manual

Programmable multistage thermostat
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Programmable Multistage Thermostat
OWNER'S GUIDE

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  • Page 1 Programmable Multistage Thermostat OWNER’S GUIDE...
  • Page 2 Your new programmable thermostat is a precision instrument that’s quality-built to give you many years of satisfactory service. It’s a “smart” thermostat that lets you save energy while still maintaining the standard of comfort you want in your home. This Owner's Guide will show you how to get the most benefit from your new thermostat.
  • Page 3 Features Check status light to see if the Monitor thermostat operation, read current thermostat is on, even in the dark. time and room temperature at a glance. Set different Set the tempera- schedules for ture warmer or weekdays, cooler at the touch Saturday, and of a key.

  • Page 4: Table Of Contents

    TABLE OF CONTENTS Adaptive Intelligent Recovery™ ......1-4 Maintaining Your Thermostat ......31-34 Removing the thermostat ........31 Programming Your Thermostat ......5-22 Replacing the thermostat ........32 Set the current day and time ........6 Replacing the batteries ......... 33 Set the program schedule and heating temperatures .........
  • Page 5 PROVIDES TOTAL INDOOR COMFORT. IT MAKES YOU FEEL BETTER; ALLOWS YOU TO LIVE AND WORK IN A MORE COMFORTABLE ENVIRONMENT; ACHIEVES MAXIMUM ENERGY SAVINGS AND MAINTAINS PRECISE CONTROL OVER INDOOR TEMPERATURE AND HUMIDITY. HONEYWELL HONEYWELL HONEYWELL ® CHRONOTHERM lll ELECTRONIC...
  • Page 6 Honeywell manufactures the following components of a Perfect Climate System: ® Honeywell Chronotherm Programmable Thermostats Honeywell F50, the air cleaners of choice Honeywell Dehumidistats Honeywell Home Ventilation Systems Honeywell F76 Water Filter Honeywell Home Security Systems...

  • Page 7: Adaptive Intelligent Recovery

    ADAPTIVE INTELLIGENT RECOVERY ™ ADAPTIVE INTELLIGENT RECOVERY™—BREAKTHROUGH TECHNOLOGY SENSES TEMPERATURE MORE LIKE YOU DO M168...
  • Page 8 ® The Chronotherm III Thermostat is Your body perceives temperature from a variety of sources, not only from so smart, it’s almost human. the air in the room, but also from your surroundings—walls, windows and furnishings. Human beings feel differences in temperature as slight as two degrees Fahrenheit.
  • Page 9 ADAPTIVE INTELLIGENT RECOVERY ™ ® System Operating THE CHRONOTHERM in Comfort Mode THERMOSTAT—THE OPTIMUM REPL SUN MON TUE WED THU FRI SAT COOL ON HEAT ON COMFORT AND ENERGY WAKE LEAVE RETURN SLEEP TEMPORARY UNOCCUIPIED SAVINGS SOLUTION REPL SUN MON TUE WED THU FRI SAT COOL ON HEAT ON WAKE LEAVE RETURN SLEEP TEMPORARY UNOCCUIPIED Recovery Continues Recovery Begins...

  • Page 10: Programming Your Thermostat

    During Adaptive Intelligent Recovery™, the thermostat increases the control temperature gradually and turns the equipment on and off several times to save energy by avoiding overshooting the comfort temperature. You can see the current control temperature anytime during recovery by pressing the PRESENT SETTING key.
  • Page 11 PROGRAMMING YOUR THERMOSTAT IMPORTANT With Adaptive Intelligent Recovery™, program the times for when you want your home comfortable. The thermostat will decide how early to begin the temperature changes. NOTE: Some models will show 32 F instead of the current temperature, indicating the thermostat is operating on backup batteries until the...

  • Page 12: Set The Current Day And Time

    Press and release. The display STEP 1 PR ESENT shows 1:00 PM MON. SET THE CURRENT DAY DAY/TIME AND TIME M5015 Press and hold until the current You can program this thermostat either day appears in the display. on the wall or in your hand. SEE PAGE 31 TO FIND OUT HOW TO REMOVE M5016 THE THERMOSTAT FROM THE...

  • Page 13: Set The Program Schedule And Heating Temperatures

    PROGRAMMING YOUR THERMOSTAT STEP 2 shows WAKE and the WAKE preprogrammed time and SET THE PROGRAM SCHEDULE MON TUE WED THU FRI ON HEAT temperature. AND HEATING TEMPERATURES WAKE M5018 If the display reads COOL, press Before You Begin… and release to switch to HEAT. The schedule form on page 37 provides HEAT/COOL an opportunity to plan your schedule.
  • Page 14 Press and hold until the display shows the desired WARMER MON TUE WED THU FRI ON HEAT temperature. WAKE M5020 COOLER If the display starts to blink while you are holding down TEMPERATURE WARMER or COOLER, you have reached the setting limit. If your thermostat can switch automatically between heating and cooling, the...
  • Page 15 PROGRAMMING YOUR THERMOSTAT Program the LEAVE time and tempera- Press and release. The display LEAVE ture, if desired. shows LEAVE, but no time or MON TUE WED THU FRI ON HEAT temperature. LEAVE NOTE: You can cancel the LEAVE, M5021 RETURN or SLEEP program by holding down the period key until the time and temperature disappear...
  • Page 16 Program the RETURN time and Press and release. The display RETURN temperature, if desired. shows RETURN, but no time or MON TUE WED THU FRI ON HEAT temperature. RETURN M5024 Press and hold until the display AHEAD shows the desired starting time. MON TUE WED THU FRI ON HEAT RETURN...
  • Page 17 PROGRAMMING YOUR THERMOSTAT Program the SLEEP time and tempera- Press and release. The display SLEEP ture, if desired. shows SLEEP and the MON TUE WED THU FRI ON HEAT preprogrammed time and tempera- SLEEP ture. M5027 Press and hold until the display shows the desired starting time.
  • Page 18 Set the SATURDAY schedule. Use Press and release until SAT the same procedure as for weekdays. appears on the display. ON HEAT SLEEP M5029 Press WAKE, LEAVE, RETURN WAKE LEAVE or SLEEP to select the time period. SLEEP RETURN Use the AHEAD/BACK keys to set the time and the WARMER/ AHEAD WARMER...
  • Page 19 PROGRAMMING YOUR THERMOSTAT Set the SUNDAY schedule. Use the Press and hold until SUN appears same procedure as for weekdays. on the display. ON HEAT SLEEP M5030 Press WAKE, LEAVE, RETURN WAKE LEAVE or SLEEP to select the time period. SLEEP RETURN Use the AHEAD/BACK keys to...

  • Page 20: Set The Cooling Temperatures

    STEP 3 Press and release. The display WAKE shows WAKE and the time and SET THE COOLING ON HEAT temperature you programmed for TEMPERATURES WAKE heating. M5031 The program times are the same for both heating and cooling. Only the Press and release so COOL cooling temperatures need to be HEAT/COOL...
  • Page 21 PROGRAMMING YOUR THERMOSTAT Press and hold until the display shows the desired temperature. WARMER MON TUE WED THU FRI COOL WAKE If the display blinks while you hold M5034 COOLER down TEMPERATURE WARMER or COOLER, you have reached the setting limit. If your thermostat can switch automati- cally between heating and cooling, the cooling temperature...
  • Page 22 Program the LEAVE temperature, if Press and release. The display LEAVE desired. shows LEAVE, the time pro- MON TUE WED THU FRI COOL grammed for heating, and 78 F. LEAVE M5035 Press and hold until the display WARMER shows the desired temperature. MON TUE WED THU FRI COOL LEAVE...
  • Page 23 PROGRAMMING YOUR THERMOSTAT Program the SLEEP tempera- Press and release. SLEEP ture, if desired. MON TUE WED THU FRI COOL SLEEP M5039 Press and hold until the display shows the desired temperature. WARMER MON TUE WED THU FRI COOL SLEEP M5040 COOLER Set the cooling temperatures for the...
  • Page 24 Use the WARMER/COOLER keys to set the temperature. WARMER COOLER Set the cooling temperatures for the Press and hold until SUN appears SUNDAY schedule. Use the same on the display. COOL procedure as for weekdays. SLEEP M5042 Press WAKE, LEAVE, RETURN WAKE LEAVE or SLEEP to select the time...
  • Page 25 PROGRAMMING YOUR THERMOSTAT Use the WARMER/COOLER keys to set the temperature. WARMER You have completed program- COOLER ming the cooling temperatures. Press and release to start the program. PROGRAM LEAVE Go to Step 4. M5043...

  • Page 26: Set The System And Fan Switches On The Subbase

    STEP 4 FAN ON: The fan runs continu- ously. Use for improved air SET THE SYSTEM AND FAN circulation during special occa- SWITCHES ON THE SUBBASE. sions or for more efficient AUTO electronic air cleaning. Depending on thermostat model, some of the switch positions shown may not FAN AUTO: Normal setting for be available to you.
  • Page 27 PROGRAMMING YOUR THERMOSTAT Then set the system switch. HEAT: The thermostat controls your heating system. COOL HEAT AUTO AUTO (select models only): The thermostat controls either your heating or cooling system, COOL HEAT AUTO depending on room temperature. COOL: The thermostat controls your cooling system.

  • Page 29: Operating Your Thermostat

    OPERATING YOUR THERMOSTAT TEMPORARILY CHANGING THE PROGRAM These features let you customize the program for those times when someone comes home early, or you’re staying up late, or you plan to be out for the evening. SKIP NEXT Press and release. The name of To keep the current temperature PERIOD the period to be skipped will flash...
  • Page 30 To temporarily raise or lower the Press and hold until the desired temperature for the current period only: temperature is reached. The WARMER ON HEAT display will flash TEMPORARY TEMPORARY until the next programmed time M5046 COOLER period starts. If you change your mind: Press and release to cancel any of the temporary settings.

  • Page 31: Permanently Changing The Program

    OPERATING YOUR THERMOSTAT PERMANENTLY CHANGING THE Press and release the desired WAKE LEAVE PROGRAM period key. If your schedule changes or you want a SLEEP RETURN different temperature, you can update any setting without affecting other program settings. Press and hold until the desired day schedule shows on the display.

  • Page 32: Manually Operating The Thermostat

    MANUALLY OPERATING THE Press and release. HOLD THERMOSTAT TEMP ON HEAT This feature is particularly useful when M5048 you go on vacation or other extended absences. It does not cancel your Press and hold to change the program. temperature setting. After a few WARMER ON HEAT seconds, the display will show the...

  • Page 33: Canceling The Program Settings

    OPERATING YOUR THERMOSTAT CANCELING THE PROGRAM Press and hold the desired period SLEEP SETTINGS key until the time and tempera- MON TUE WED THU FRI ON HEAT ture clear from the display (about LEAVE The thermostat requires time and three seconds). M5052 LEAVE temperature settings in the WAKE...

  • Page 34: Checking The Program Times And Temperatures

    CHECKING THE PROGRAM TIMES Press and release the desired WAKE AND TEMPERATURES period key. The start time and MON TUE WED THU FRI ON HEAT temperature setting will appear on SLEEP You can check all the stored settings the display. M5054 SLEEP without affecting the permanent...

  • Page 35: Checking The Current Temperature Setting

    OPERATING YOUR THERMOSTAT CHECKING THE CURRENT Press and release. The display PRESENT TEMPERATURE SETTING will show the current temperature SETTING ON HEAT setting for several seconds, then Press a single key to compare current revert to the room temperature. M5057 room temperature to the current temperature setting at any time.

  • Page 37: Maintaining Your Thermostat

    MAINTAINING YOUR THERMOSTAT REMOVING THE THERMOSTAT 1 Loosen the two captive screws at 2 Pull out the thermostat from the 3 Lift the thermostat up and off the the bottom corners of the case. bottom. subbase. SYSTEM TEMPERATURE PRESENT PROGRAM SETTING PERIOD TIME...

  • Page 38: Replacing The Thermostat

    REPLACING THE THERMOSTAT 1 Hang the thermostat on the tabs 2 Swing down and press on the 3 Tighten the captive screws. at the top of the subbase. lower edge until the thermostat snaps into place. SYSTEM RETURN HEAT ON SYSTEM TEMPERATURE PRESENT...

  • Page 39: Replacing The Batteries

    MAINTAINING YOUR THERMOSTAT REPLACING THE BATTERIES Your thermostat uses three AAA To replace: sure the positive (+) terminals all alkaline batteries. We recommend Set the system switch to OFF. face toward the right. ® Energizer batteries. The display will Remove the thermostat from the Replace the thermostat on the flash REPL BAT when the batteries wall.

  • Page 40: Power Outages

    POWER OUTAGES Backup batteries will hold the If the display goes off when power is programming and keep the display lost, either the backup batteries need on during most power outages. Once to be replaced or are not installed. the power is restored, the system will When power is restored, the display resume normal operation.

  • Page 41: Glossary

    GLOSSARY Preprogrammed schedule operates the heating or cooling Adaptive Intelligent Recovery™ This is the schedule programmed equipment to return the house from See pages 1-4. into your thermostat at the factory. It the energy savings temperature to sets a night program that provides the comfort temperature.

  • Page 42: Glossary

    Setup SYSTEM light (yellow) RETURN—The time period when Raising the temperature in the house This light (located on thermostat) you want the house at a comfort- for a set period every day in summer glows whenever the thermostat is able temperature for family for energy savings.

  • Page 43: Your Personal Program

    YOUR PERSONAL PROGRAM You can use the tables below to plan your schedule before you begin programming. If you choose not to program a daytime energy savings period, leave the LEAVE and RETURN periods blank. Weekday Program START HEATING COOLING PERIOD TIME TEMPERATURE...

  • Page 44: Your Personal Program

    Sunday Program START HEATING COOLING PERIOD TIME TEMPERATURE TEMPERATURE WAKE LEAVE RETURN SLEEP YOUR PERSONAL PROGRAM...

  • Page 45: Troubleshooting Guide

    TROUBLESHOOTING GUIDE IF… THEN… Display will not come on. Check that heat or cool system power is on. If you use batteries, replace with fresh ones. Make sure thermostat is correctly mounted on the subbase. Display flashes during programming. You have reached the temperature setting limit. The setting range is 45 F to 88 F.
  • Page 46 Heating will not come on. Check the fuse or circuit breaker and replace or reset when necessary. Check that the switch on the thermostat is set to HEAT or AUTO. Heating will not come on. (con't) If temperature setting is higher than current temperature, and display says HEAT ON or SYSTEM light is on, contact your heating and air conditioning contractor.

  • Page 47: Chronotherm Iii Thermostat Questions

    CHRONOTHERM III THERMOSTAT QUESTIONS First, the Chronotherm III Thermostat is a very accurate instrument designed to The temperature displayed on sense both air temperature and wall temperature, like your body does. It gives the Chronotherm III Thermo- an average reading over a period of time. Second, it is self-adjusting, and will stat doesn’t always match the take a few days after installation to adapt to your home.

  • Page 48: Chronotherm ® Iii Thermostat Questions

    How long does the HOLD key Forever! The HOLD key will hold the temperature indefinitely. The only way to hold? release it is to push the RUN PROGRAM key or change the system switch positions if applicable. Two ways. First, it saves energy (and money) by setting back the temperature How can this thermostat save energy when it comes on and for blocks of time during the day or night.

  • Page 49: Quick Reference To The Keys

    QUICK REFERENCE TO THE KEYS Press these keys to: Begin the current day or time PR ESENT programming. DAY/TIME Set the day of the week and select the program day during programming. Select the time period to WAKE LEAVE program or review. SLEEP RETURN Switch between heat and cool...

  • Page 50: Quick Reference To The Keys

    Set the temperature while programming and temporarily change the temperature during WARMER operation. Hold down either key to change the setting faster. COOLER Hold any temperature you desire for an ex- HOLD tended period. TEMP Change the temperature to the set point of the CHANGE previous period.

  • Page 51: Index

    INDEX Batteries, replacement ....33 Heating temperatures ....7 Blinking display ......39 Hold temperature ....26, 41 Quick reference to the keys ..43 Canceling programs ....27 Keys ..........43 RETURN ....... 36, 43 Change temperature ....23 Removing thermostat ....
  • Page 52 Sunday program ..13, 18, 36, 38 Table of Contents ......i WAKE ........36, 43 Switch, fan ........20 Temporary program changes ..23 Weekday program ..7, 14, 36, 37 Switch, system ......21 Time ..........6 System light ........ 35 Time period .........

  • Page 53: Limited One-Year Warranty

    Honeywell warrants this product, excluding battery, to be free from defects in the workmanship or materials, under normal use and service, for a period of one (1) year from the date of purchase by the consumer. If, at any time during the warranty period, the product is defective or malfunctions, Honeywell shall repair or replace it (at Honeywell’s option) within a reasonable period of time.
  • Page 56 Simple Four-Step Programming Of course, you can use the schedule preprogrammed into your new thermostat (see Glossary, page 35). But it’s an easy matter to program the thermostat to fit your lifestyle. Set the current time and day. See page 6. Set the program schedule and heating temperatures.
  • Page 57 Home and Building Control Home and Building Control Helping You Control Your World Honeywell Inc. Honeywell Limited—Honeywell Limitée 1985 Douglas Drive North 740 Ellesmere Road Golden Valley, MN 55422 Scarborough, Ontario M1P 2V9 QUALITY IS C.H. • Printed in Taiwan R.O.C. • Form Number 69-0743 • 7/93...

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