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 Enter the day and time ......................... 1 Set the program times and temperatures for one day ................... 2 Copy the program to the desired days ....... 11 Set the program times and temperatures for the remaining days ..................... 14 Set the system and fan switches on the subbase ............................. 17 Operating Your Thermostat ................. 19-26 Temporarily changing the program ......... .19 Permanently changing the program ......... .21 Operating the thermostat manually .......... .23 Canceling program settings ................. .24 Checking the program times and temperatures .............................. ,215 Checking the current temperature setting ... .26 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 .................. Troubleshooting Guide ...................... Quick Reference to the Keys ................ Index ......................................... 35-36 37-38 39-40 41-42 Warranty ........................................ .43 I I STEP 1 ENTER THE DAY AND TIME You can program this thermostai either on the wall or in your hand. SEE PAGE 27 TO FIND OUT HOW TO REMOVE THE THERMOSTAT FROM THE WALL 0 PRESENT DAY/TIME SET Press and release. The display shows 1:00 PM Mon. Press and hold until the current day appears in the display. pii-] TIME Always press the keys with your fingertip or similar blunt tool. Sharp instruments like a pen or pencil point can damage the keyboard. NOTE: Check the glossary, page 31, for definitions of unfamiliar words. ml A, :' El Press and hold until the current time appears in the display. Be sure AM or PM appears as desired. You have set the current day and time. Go on to Step 2. [-7$X-=] 1 STEP 2 SET THE PROGRAM TIMES AND TEMPERATURES FOR ONE DAY Before You Begin. . . The schedule form on page 33 provides an opportunity to plan your daily program. Now. . . Choose a day to program first. We'll use Monday in the examples, but you can start with any day. Start by programming the MORNING time and temperatures. The thermostat requires a MORNING program every day. You can set additional programs as desired. m¶ - `.. Press and release. Note that the display shows MORNING and the preprogrammed time and temperature. If the display reads COOL, press and release to switch to HEAT. Press and hold until MONDAY (or the desired day) appears in the display. Press and hold until the display shows the time you want the temperature at the comfort setting. I ml 00 - Press and hold until the display shows the desired heating temperature. If the display flashes 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 heating temperature must be at least 3 degrees below the air conditioning temperature. For example, if the cooling setting is 75' F, the maximum heating setting is 72" F. To set a higher heating temperature, you must first raise the cooling setting. Program the MIDDAY time and heating temperature if desired. NOTE: You can cancel any period showing on the display except MORNING by pushing the the CANCEL PERiOD key. To move to the next period while programming, simply press the PERIOD key again. Press and release. The display shows MIDDAY, but no time or temperature. ml '" Press and hold until the display shows the time you want room temperature to start drifting toward the energy saving setting. Press and hold until the display shows the desired temperature. 4 Program the EVENING time and temperature, if desired. Press and release. The display shows EVENING, but no time or 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. 5 Program the NIGHT time and temperature, if desired. Press and release. The display shows NIGHT and the preprogrammed time and temperature. Press and hold until the display shows the time you want the temperature to start drifting toward the energy saving setting. Press and hold until the display shows the desired heating temperature. 6 Set the cooling temperatures for all the periods you've programmed. Press and release. The display shows COOL, the preprogrammed cooling temperature and the programmed start time for NIGHT. 7 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 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 conditioning temperature. For example, if the heating setting is 72' F, the minimum cooling setting is 75' F. To set the cooling temperature lower, you must first lower the heating setting. 8 Press and release. The display shows the preprogrammed cooling temperature and the programmed start time for MORNING. Press and hold until the display shows the desired cooling temperature for MORNING. Press and release. The display shows the preprogrammed cooling temperature and the programmed start time for MIDDAY. Press and hold until the display shows the desired cooling temperature for MIDDAY. [-Ep--JE] [ppyG"""J 9 m¶ = -.. Press and release. The display shows the preprogrammed cooling temperature and the programmed start time for EVENING. Press and hold until the display shows the desired cooling temperature for EVENING. You have completed setting the program schedule for one day. Go to Step 3 to copy this program to additional days. 10 STEP 3 COPY THE PROGRAM TO THE DESIRED DAYS You can copy one day's program to any other day or combination of days. The new program will replace any program already set in the day selected. If necessary, press and release to enter the programming mode. Press and hold until the day containing the program to be copied shows in the display. Press and release. The day to be copied will show, and the next day will flash, in the display. Press and release if you wish to copy the program into the day that's flashing in the display. Note that the next day now starts to flash. Press and release if you don't wish to copy into the day that's flashing. Note that the next day now starts to flash. Press and release the COPY TO key again to select the day that's flashing, or the DAY key to bypass it. Continue until all desired days are showing in the display and are not flashing. Press and release to copy the program into all the days you have selected. NOTE: The display will show 32" F instead of the current temperature until the thermostat is mounted on the subbase and the system is powered. 12 STEP 4 SET THE SCHEDULES AND TEMPERATURES FOR THE REMAINING DAYS Use the procedures described in Steps 2 and 3 and summarized in this step to program the remaining days. Press and release to enter the programming mode. Press and hold until the day you wish to program shows on the display. If COOL shows on the display, press and release to switch to HEAT. Use the AHEAD/BACK keys to set the time and the WARMER/COOLER keys to set the heating temperature. 13 Press and release the PERIOD key to step through the remaining time periods. Use the AHEAD/BACK keys to set the _. time and the WARMER/COOLER keys to set the heating temperature for each time period. Press and release so COOL shows on the display. Press and release the PERIOD key to step through the time periods, and use the WARMER/ COOLER keys to set the cooling temperature for each period. 14 You have completed the time and temperature program for another day. Now you can copy it into additional days if you wish. l' -a I!H Press and release to enter the copy mode. The next day flashes on the display. Press and release the Copy To key to select the day that's flashing, or the Day key to bypass it. Continue, using the Copy To key to bring up the next day, followed by Copy To to select, or Day to bypass the day, until all desired days are selected. Press and release to complete the copy. Repeat Step 4 as needed until all days are programmed. 15 l0 H ,' H NOTE: The display will show 32" F until the thermostat is mounted on the subbase and the system is powered. [-yx""`l 16 TEMPORARILY CHANGING THE PROGRAM These features let you customtailor 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. To keep the current temperature through the next program period: Press and release. The name of the period to be skipped will flash in the display until the start time of the skipped period. During the skipped period the display will flash "temporary" to show that the programmed temperature for this period is not being used. 19 To go back to the temperature of the previous program period: 0 CHANGE TO LAST PERIOD Press and release. The display will show the name of the previous period and flash "temporary" until the next regularly scheduled period starts. To temporarily raise or lower the temperature for the current period only: Press and hold until the desired temperature is reached. The display will flash "temporary" until the next programmed time period starts. If you change your mind: Press and release to cancel any of the temporary settings. [,,..I PERMANENTLY CHANGING THE PROGRAM 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 time period shows on the display. Press and hold until the desired schedule day shows on the display. Press and hold the Time or Temperature keys until the display shows the desired new program. 21 - S You can copy the new program into other days if you wish. When you copy a program, all the times and temperatures for that day are copied. Press and release. The next day will flash on the display. Press Copy To to copy into, or Day to. bypass, the day. Continue until the program has been copied into all desired days. . m IwtOR&bAI Press and release to return to normal operation. I _ 22 OPERATING THE THERMOSTAT MANUALLY This feature is particularly useful when you go on vacation or other extended absence. It does not cancel your program. Press and release. Press and hold to change the temperature setting. After a few seconds the display will show the current temperature. Press and release to check the temperature setting. IPR%AMi Press and release to cancel manual control. 23 CANCELING PROGRAM SETTINGS The thermostat requires time and temperature settings in the MORNING time period for each day, but any of the others can be canceled. Each time period for each day must be canceled separately. - -.. Ea Press and hold until the desired time period shows on the display. m .' Press and hold until the desired day shows on the display. Press and release to cancel the time and temperature settings for that time period. Both the heating and cooling temperatures will be canceled. You can use the copy function to cancel the program from other days, but remember: all the programs will be copied, not just the cancellation. Press and release to return to normal operation. 24 CHECKING THE PROGRAM TIMES AND TEMPERATURES You can check all the stored settings without affecting the permanent program. Press and hold until the desired period shows on the display. The start time and temperature setting will appear on the display. Press and release to display the next day's time and temperature for that period. IPREAI Press and release to return to normal operation. [":] 25 CHECKING THE CURRENT TEMPERATURE SETTING Press a single key to compare actual room temperature to the setting at any time. 0 PRESENT SETTING Press and release. The display will show the current temperature setting for several seconds, then revert to the room temperature. During recovery from energy savings, the setting displayed will not match the pr ...