Honeywell Chronotherm III User Manual
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Honeywell Chronotherm III User Manual

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See also: Owner's Manual
Your new Honeywell Chronotherm III
Fuel Saver Thermostat is a precision
instrument that's quality-built to give
you many years of satisfactory
service. Each day of the week can be
programmed independently so that,
regardless of your schedule, you'll
save fuel while automatically
maintaining the standard of comfort
you require.
This User's Guide will show you how
to get the most benefit from your new
thermostat.
Programming Your Thermostat ............... l-1 8
one day ................... 2
the program times and temperatures
Set
the
remaining
for
days ..................... 14
Set the system and fan switches
on the subbase ............................. 17
Operating Your Thermostat ................. 19-26
Canceling program settings ................. .24
temperatures .............................. ,215
Maintaining Your Thermostat ............... 27-30
Removing the thermostat .................... .27
Replacing the thermostat .................... .28
Replacing the batteries . . . . . . . . . . . . . . . . . . . . . . .29
Power outages .............................. .30
Glossary ..................................... 31-32
Your Daily Program ......................... 33-34
Model Identification Guide .................. 35-36
Troubleshooting Guide ...................... 37-38
Quick Reference to the Keys ................ 39-40
Index ......................................... 41-42
Warranty ........................................ .43

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Max Buchwald
March 3, 2025

my thermostat is displaying AC IT WILL NOT operate in air-conditioning or heat mode.please send suggestion. Thanks

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Summary of Contents for Honeywell Chronotherm III

  • Page 1: Table Of Contents

    Your new Honeywell Chronotherm III Fuel Saver Thermostat is a precision instrument that’s quality-built to give you many years of satisfactory service. Each day of the week can be programmed independently so that, regardless of your schedule, you’ll save fuel while automatically maintaining the standard of comfort you require.

  • Page 2: Enter The Day And Time

    STEP 1 Press and release. The display PRESENT shows 1:00 PM Mon. ENTER THE DAY AND TIME DAY/TIME You can program this thermostai either on the wall or in your Press and hold until the current pii-] hand. SEE PAGE 27 TO FIND day appears in the display.
  • Page 3 Press and hold until the display shows the desired heating temperature. If the display flashes while you are holding down TEMPERA- TURE WARMER or COOLER, you have reached the setting limit. If your thermostat can switch automatically between heating and cooling, the heating temperature must be at least 3 degrees below the air condition- ing temperature.
  • Page 4 Program the EVENING time and Press and release. The display shows EVENING, but no time or temperature, if desired. temperature. Press and hold until the display shows the time you want the temperature to be at the comfort setting. Press and hold until the display shows the desired heating temperature.
  • Page 5 Press and release. The display Set the cooling temperatures for shows COOL, the prepro- all the periods you’ve grammed cooling temperature programmed. and the programmed start time for NIGHT. Press and hold until the display shows the desired cooling temperature for NIGHT. If the display blinks while you are holding down TEMPERATURE WARMER or COOLER, you have...
  • Page 6 Press and release. The display shows the preprogrammed cool- ing temperature and the pro- grammed start time for MORNING. Press and hold until the display shows the desired cooling temperature for MORNING. [-Ep--JE] Press and release. The display shows the preprogrammed cool- ing temperature and the pro- grammed start time for MIDDAY.

  • Page 7: Copy The Program To The Desired Days

    If necessary, press and release STEP 3 to enter the programming mode. COPY THE PROGRAM TO THE DESIRED DAYS Press and hold until the day You can copy one day’s program containing the program to be to any other day or combination copied shows in the display.
  • Page 8 Press and release to enter the STEP 4 programming mode. SET THE SCHEDULES AND TEMPERATURES FOR THE REMAINING DAYS Press and hold until the day you wish to program shows on the Use the procedures described in display. Steps 2 and 3 and summarized in this step to program the If COOL shows on the display, remaining days.

  • Page 9: On The Subbase

    Press and release to enter the You have completed the time ’ copy mode. The next day flashes and temperature program for on the display. another day. Now you can copy it into additional days if you wish. Press and release the Copy To key to select the day that’s flashing, or the Day key to bypass it.

  • Page 11: Temporarily Changing The Program

    TEMPORARILY CHANGING THE PROGRAM These features let you custom- tailor the program for those times when someone comes home early, or you or a colleague is working late, or you plan to be out for the evening. Changes made with these keys are active for one program period and then are cancelled.

  • Page 12: Permanently Changing The Program

    PERMANENTLY CHANGING Press and hold until the desired THE PROGRAM time period shows on the display. If your schedule changes or you want a different temperature, you can update any setting without affecting the rest of the program. Press and hold until the desired schedule day shows on the display.

  • Page 13: Operating The Thermostat Manually

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

  • Page 14: Checking The Program Times And Temperatures

    CHECKING THE PROGRAM Press and hold until the desired TIMES AND TEMPERATURES period shows on the display. The start time and temperature set- You can check all the stored ting will appear on the display. settings without affecting the permanent program. Press and release to display the next day’s time and temperature for that period.

  • Page 15: Removing The Thermostat

    REMOVING THE THERMOSTAT 1 Loosen the two captive screws at 2 Pull the thermostat out 3 Lift the thermostat up and off the the bottom cornerg of the case. from the bottom. base. REPLACING THE THERMOSTAT 2 Swing down and press on lower edge until ther- 1 Hang the thermostat on the tabs 3 Tighten the captive screws.

  • Page 16: Replacing The Batteries

    REPLACING THE BATTERIES To replace: Insert the new batteries, mak- Set the system switch to OFF. ing sure the positive (+) termi- Your thermostat uses three AAA nals all face toward the right. Remove the thermostat from alkaline batteries. The display will the wall.
  • Page 17 AUX HT light (heat pump models EM HT light (beat pump models gram is lost for any reason. The only) program, which is the same for only) This light glows whenever the This light glows whenever the all days of the week, is: thermostat is callina for ooera- thermostat system switch is in slan...
  • Page 18 You can use the table below to plan your schedule before you begin programming. If you choose not to program a daytime energy savings program, leave the MIDDAY and EVENING periods blank. After you have written in your schedule, mark the days that have identical programs.
  • Page 19 THERMOSTATS FOR GAS, OIL, OR ELECTRIC HEAT SYSTEMS These thermostats vary in the switching configurations they provide. HEAT-AUTO-COOL-OFF HEAT-OFF-COOL THERMOSTAT FOR HEAT PUMP SYSTEMS EM HT-HT-OFF-AUTO-COOL...
  • Page 20 IF. . . THEN. . . a Check that heat or cool system power is on. If you use batteries, Display will not come on. replace with fresh ones. Make sure thermostat is correctly mounted on base. Display flashes during programming. a YOU have reached the temperature setting limit The setting range is 45°F to 88°F.
  • Page 21 Press these keys to: Begin the current day or time programming Set the day of the week, select the program day during programming, and bypass a day while copying. Select the time period to program, review or cancel Cancel the day and time period shown on the display, (ex,cept MORNING) as well,as both the heating and cooling temperatures.

  • Page 22: Glossary

    Present setting.. Glossary ..... . .31 Batteries. replacement ..29 P r o g r a m s c h e d u l e . . . 2 . 3 3 Slinking display ....
  • Page 24 Together.we can find the answers. Honeywell...

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