T8621 Chronotherm III

T8621 Chronotherm III

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 .................. 35-36

Troubleshooting Guide ...................... 37-38

Quick Reference to the Keys ................ 39-40

Index ......................................... 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

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.

0

TIME

:’

El

Press and release. The display shows 1:00 PM Mon.

Press and hold until the current day appears in the display.

Press and hold until the current sure AM or PM appears as desired.

You have set the current day and time. Go on to Step 2.

pii-]

[-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.

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.

I

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.

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.

00 -

ml

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 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.

Press and release. The display shows MIDDAY, but no time or temperature.

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.

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.

5

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.

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.

7

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

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.

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.

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.

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.

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.

13

14

You have completed the time l

’ and temperature program for

I!H

another day. Now you can copy it into additional days if you wish.

l

-

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.

NOTE: The display will show

32” F until the thermostat is mounted on the subbase and the system is powered.

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.

[-yx”“‘l

15

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.

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:

If you change your mind:

Press and hold until the desired temperature is reached. The display will flash “temporary” until the next programmed time period starts.

Press and release to cancel any of the temporary settings.

[,,..I

19

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.

-

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.

m bypass, the day. Continue until the program has been copied into all desired days.

IwtOR&bAI

Press and release to return to normal operation.

21

_

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.

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.

m

.’

Press and hold until the desired time period shows on the display.

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.

23

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.

[“:]

CHECKING THE CURRENT

TEMPERATURE SETTING

Press a single key to compare actual room temperature to the setting at any time.

0

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 programmed setting. This is because the thermostat gradually changes the temperature setting during recovery to provide maximum comfort combined with most efficient use of the heating or cooling equipment

I”““1

25

26

REMOVING THE THERMOSTAT

1 Loosen the two captive screws at 2 Pull the thermostat out the bottom cornerg of the case. from the bottom.

3 Lift the thermostat up and off the base.

REPLACING THE THERMOSTAT

2 Swing down and press

1 Hang the thermostat on the tabs on lower edge until therat the top of the base.

mostat snaps in place.

3 Tighten the captive screws.

27

28

REPLACING THE BATTERIES

Your thermostat uses three AAA alkaline batteries. The display will flash “REPL BAT” when the batteries get low. Unless the display is blank (indicating the batteries are dead) when you start, you won’t have to reprogram the thermostat if you can insert the new batteries within 20-30 seconds of taking out the old ones.

To replace:

n

Insert the new batteries, makn

Set the system switch to OFF. ing sure the positive (+) termin

Remove the thermostat from nals all face toward the right.

n the wall. See page 27. n

Replace the thermostat on the

Lift the batteries out of the wall. See page 28.

holder. n

Reprogram, if necessary.

29

POWER OUTAGES

Reasonably fresh backup batteries will hold the programming and keep the display on during most power outages. Once the power is restored, the system will resume normal operation.

If the display goes off when power is lost, either the backup batteries need to be replaced or are not installed. When power is restored, the display will flash

1:00 PM to remind you to reprogram.

30

AUX HT light (heat pump models

only) -

This light glows whenever the thermostat is callina for ooeration of the backup fieater.’

Backup (auxiliary) heat is more expensive to operate than the heat pump and typically is used only when the heat pump is unable to handle the load.

C$Klight (heat pump models

Consult your heat pump equipment literature to determine whether this light is used and its meaning.

Comfort temperature

The temperature you want when you’re active and occupying the building.

EM HT light (beat pump models only)

This light glows whenever the thermostat system switch is in the EM HT~ position.

Energy-saving temperature

The lower (heating) or higher

(cooling) temperature that lets you save on heating and cooling costs when you’re asleep or away. Also called the setback

(heating) or setup (cooling) temperature.

Preprogrammed schedule

This is the schedule programmed into your thermostat at the factory. It sets a night program that provides energy savings if you don’t set your own program, or if your personal program is lost for any reason. The program, which is the same for all days of the week, is: slan

Period Time

MORNING co0 AM 70’F

M,DW,,

TemperabJre

&¶Ii”g CoDring

78OF

NO p,,Jgmm svss,no . . . . . . NO program

N I G H T 10.00PM 60OF 78-F

Program

The times and temperatures you set to define the comfort and energy savings periods for each day’s schedule.

Recovery

The time when the thermostat operates the heating or air conditioning equipment to return the house from the energy savings temperature to the comfort

31 temperature. The thermostat starts the recovery period early so the house will be at the comfoh;o;;ng by the time you’ve

Setback

Reducing the temperature in the house for a set period every day in winter for energy savings. The lower temperature is the energy savings temperature.

S e t u p

Raising the temperature in the house for a set period every day in summer for energy savings.

The higher temperature is the energy savings temperature.

Set point

The thermostat temperature setting you select. The thermostat turns the heating or cooling equipment on and off to maintain this temperature at the thermostat location until another temperature setting (set point) goes into effect.

SYSTEM light

This light glows whenever the thermostat is calling for heating or air conditioning.

Time period

One of four program periods:

MORNING, MIDDAY, EVENING, and NIGHT; available with the

Chronotherm Ill thermostat. One period begins when the previous program period ends.

MORNING-The time period when’you bring the building to a comfortable temperature to begin the day. This is the only period that must contain a time and temperature for every day.

MIDDAY-The time period when you can set back (winter) or up (summer) the temperature for daytime energy savings if.the building is unoccupied.

EVENING-The time period when you want the building at a comfortable temperature for evening activities after daytime energy savings.

NIGHT-The time period when you can set back (winter) or up (summer) the temperature for energy savings because family members are asleep or the building is unoccupied. Often a NIGHT energy savings temperature is set only for the heating season so family members can sleep cool in summer.

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.

34

THERMOSTATS FOR GAS, OIL,

OR ELECTRIC HEAT SYSTEMS

These thermostats vary in the switching configurations they provide.

THERMOSTAT FOR HEAT

PUMP SYSTEMS

EM HT-HT-OFF-AUTO-COOL

35

IF. . .

Display will not come on.

THEN. . .

a Check that heat or cool system power is on. If you use batteries, replace with fresh ones.

Display flashes during programming. a YOU have reached the temperature setting limit The setting range is

45°F to 88°F. In models with automatic heat-cool changeover, the

COOL temperature setting must be at least 3°F above the HEAT temperature setting.

. Programming has been lost because of a power outage. You must reprogram.

Program is lost due to power outage.

Temperature change occurs at the wrong times.

. Check that backup batteries are installed correctly. Replace if necessary. Reprogram the thermostat

. Check the program times for the period in question. Be sure that

AM and PM indications are correct Make sure the current day and time are correct Reprogram if necessary.

. Rememberthatthe heating equipmentorairconditionercomeson

before the MORNINGS and EVENING start times so the house will be at the desired temperature when the period starts.

Heating will not come on.

n

Check that switch on thermostat is set to HEAT or AUTO.

s,

Cooling will not come on.

The building is too warm or too cool.

Display says HEAT ON or system light is on, but no heat is coming from the registers.

Display flashes REPL BAT or goes blank when power is turned off.

Heatpumpthermostatshaveabuilt-in timedelay which may add to time delays in the heating equipment. Allow up to 10 minutes after changing the setting before the compressor starts.

. If temperature setting is higher than current temperature, and displaysaysHEATONorSYSTEM light ison, contactyourheating and air conditioning contractor.

. Check thefuseor circuit breaker

and

replaceor reset if necessary.

. Check that switch on thermostat is set to COOL or AUTO.

. The thermostat has a built-in time delay, which may add to time delays in the cooling equipment Allow up to 10 minutes after changing the setting before the air conditioner starts.

n

If temperature setting is lower than current temperature, and displaysaysCOOLONorSYSTEM light ison, contactyourheating and air conditioning contractor.

w Press PRESENT SETrING to check the current temperature setting.

. If desired, change the time or temperature setting. See page 21.

. Allowtimefortheheating equipmenttoheatupand thefan to come on before checking for heat at the register.

. Install fresh alkaline batteries.

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.

Switch between heat and cool modes during programming or when reviewing the program.

Set the time ahead and back. Hold either key down to change the setting faster.

Set the temperature while programming and temporarily change the temperature during operation. Hold either key down to change the setting faster.

39

Select one day’s program to copy to another day

Select a day to copy a program to

Hold any temperature you desire for an extended period.

Chrmi,e the temperature to the set point of the previous

Maintain the current temperature through the next program period.

Start your programmed schedule, cancel temporary program changes, and cancel Hold Temp.

See the current temperature setting. Setting may not match programmed setting during recovery from energy savings.

Batteries. replacement ........ .29

Slinking display ............ .30,37

Canceling programs .......... .24

Change temperature .... .20,21,23

Checking present setting ...................... .26

Checking programs .......... .25

Clock display ................. *,l

Cooling temperatures .......... 7

Daily Program ................ .33

Day ............................. 1

Display., ...................... *,l

Energy-saving temperature ................ (31

Evening ....................... .32

Fan switch ..................... 17

Features ........................

*

Flashing display ........... .30,37

Glossary . . . . . . . . . . . . . . . . . . . . . . .31

Heating temperatures .......... 2

Hold temperature ............. .23

Identification. model .......... .35

Keys . . . . . . . . . . . . . . . . . . . . . . . . . . .39

Light ............................

*

Maintenance. . . . . . . . . . . . . . . . . . .29

Manual operation ............. .23

Midday,, ...................... .32

Model descriptions ........... .35

Morning . . . . . . . . . . . . . . . . . . . . . . . .32

Night .......................... .32

Operation .................. 19-24

Period, Time .................. (32

Power outage. ................ .30

Preprogrammed schedule.. ................ ..3 1

Present setting.. .26

P r o g r a m s c h e d u l e . . . 2 . 3 3

Programming overvtew.

*

Programming steps 1

Quick reference to the keys .39

R e m o v i n g t h e r m o s t a t 2 7

Replacing batteries .29

Setback.. _. _. 31

Set cooling temperatures 7

Set current day _. 1

Set current time.. 1

Setfan switch ,............__._ 17

Set heating temperatures 2

S e t p r o g r a m s c h e d u l e . . 2

Set system switch 17

Setting limits .................. 3,6

Setup ......................... .32

Skip. ........................... 19

Switch, fan ..................... 17

Switch, system,, ............... 17

System light . . . . . . . . . . . . . . . . . . . .32

System switch ................ (17

Table of Contents ................ i

Temporary program changes ................. 19-24

Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Time period ................... .32

Troubleshooting .............. .37

Warranty ...................... .42

*See the product features inside the front cover.

42

Together.we can find the answers.

Honeywell

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