Honeywell Chronotherm IV User manual

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Manual for
Chronotherm IV
Congratulations…
You are the owner of the Chronotherm IV, type T 8602A, the most advanced digital
programmable thermostat that Honeywell has ever produced.
With the Chronotherm IV thermostat you can realise almost any wishes in the field of
home-climate control you can wish for. For a maximum of six periods per day you can set
the temperature, and finetune the desired temperature to half a degree.
The Chronotherm IV is equipped with Adaptive Intelligent Recovery, which makes sure
that the desired temperature is being reached on the time you requested. Using the
thermostat is most simple.
Honeywell has experience in developing thermostats for more than a hundred years. The
combination of this experience with state-of-the-art technology ensures your top level in
home comfort. With the aid of this manual you’ll learn step by step to program your
thermostat, and additional examples show you how you can use your thermostat most
efficiently.
Translation of Dutch terms on the Control Panel (see the inside of front cover of Dutch
manual)
4. Today as Sunday / Tomorrow as Sunday
5. Holiday Timer
6. Temperature Continuous (manual mode)
7. Start Program (back to functioning according to program)
8. (from left to right, top to bottom:) Rising / Leaving / Sleep / Coming Home
9. Forward / Back
10. Summertime – Wintertime
11. Copy Day
12. Setting Day / Time
13. Day
1. Time, day of the week and room temperature are continuously shown on the display.
The flame-symbol indicates when the heater is being activated.
2. Pressing one of these buttons the set temperature is being changed for only the
duration of the present period.
3. Shows the temperature which is set at the present moment, the temperature outside
and the and the set temperature of the tele-function (if these additions have been
installed).

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4. With these buttons you can, for one time, change the program for today and/or
tomorrow to Sunday’s program.
5. With this button you select one of the unique holiday/timer functions.
6. With this you can for an undetermined period set a steady temperature.
7. With this button you acknowledge alterations in the program, delete temporary
changes or just get back to normal mode.
8. With these period-buttons you select the period of which you are about to change or
check the time and temperature.
9. With this you set the clock and also the times belonging to the program.
10. With this button you switch quickly from Summer to Wintertime or back.
11. Pressing “Copy Day” during programming the program of one day is being copied to
other days of the week.
12. This button controls the setting of the clock and day of the week.
13. With this you choose the day of the week when checking the program or
programming.
EASY PROGRAMMING IN THREE STEPS
Naturally you can use the factory setting of the thermostat which are set until you change
them (see Programming your thermostat – Factory Settings). However, it is quite simple
to adapt this program to your own desired week program.
Step 1: Program the right time and day of the week and select Summer- or Wintertime
(See: Programming your thermostat – Programming the right day, time and
Summer/Wintertime).
Step 2: Program your desired time-temperature settings for the week (see: Programming
your thermostat).
Step 3: Press START PROGRAM to acknowledge and activate the new program.
BEFORE USING YOUR THERMOSTAT
The Chronotherm IV has a number of characteristics that distinguishes this thermostat
from other programmable thermostats. By learning more about these characteristics you
can optimalize the possibilities which the Chronotherm IV offers.
Adaptive Intelligent Recovery
The Chronotherm IV makes sure that, on the time you have programmed, the desired
temperature has been reached. The thermostat does this by daily calculating and
monitoring the time it needs to warm up the room.
Using this information, the thermostat calculates at what time it’s supposed to start
warming up the next day. When programming, you just punch in the time on which you
want the new temperature realized.
The time at which the thermostat starts to warm up is different every time. During a cold
period the thermostat starts to warm up earlier than in Spring or Autumn. So it is not
necessary to change the warming-times yourself as the seasons turn. As soon as the

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thermostat is installed, it starts its daily correction process of its Adaptive Intelligent
Recovery. After a few days the thermostat has calculated the right time for heating up.
Intelligent Heating
Your body perceives temperature from a variety of sources, not only from the air in the
room, but also from your surroundings – walls, windows and furniture. Common
thermostats sense only air temperature, which may or may not reflect how hot or cold the
room actually feels to a person. The Chronotherm IV reads the temperature of the wall as
well of the air – and responds to temperature changes as little as half a degree Celcius –
so room temperature is more likely to “feel right”.
In the morning, heating up is being done very gradually. Not only does this diminish the
risk of “overshoot”, meaning that the heating up exceeds the desired temperature. Also
the gradual heating up means less strain on the pipes in your home.
Programming Options
You can program at least four temperature-changes (periods) per day. These periods are
called RISING, LEAVING, COMING HOME AND SLEEP. To activate the periods you
program the beginning time and the desired temperature, if necessary for each day in a
different way. If four periods per day are not sufficient, you can easily extend the number
of periods per day to six with the periods LEAVING 2 and COMING HOME 2. This
allows you to program a raise in temperature if you come home around lunch.
Extra programming options
•Using COPY DAY you can quickly and easily program the other days of the week.
•The thermostat has a unique holiday/timer function which can hold a temperature for
a time until a certain moment. You can use this function for a holiday, for a weekend
away from home or even for a few hours using the timer.
•By touching only one button you can change today’s and/or tomorrow’s program into
Sunday’s program.
Flame symbol
As soon as the thermostat switches on the heater, the Chronotherm IV display shows a
flame symbol in the lower left side of the screen. This allows you to ascertain at any time
if your heater is being active.
Batteries
Before using the Chronotherm IV you need to place 3 ‘penlight’ alkaline batteries (type
AA). The average lifespan of batteries in the Chronotherm IV is at least two years (see
also: Replacing the batteries). As soon as the batteries are in place, the Chronotherm IV
will function according to the factory setings of the period RISING of Monday.

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Manual control right after installation
After the batteries have been placed you can, if you don’t program the thermostat right
away, control the Chronotherm IV manually first.
You activate manual control by pressing Arrow Up (red: warmer) or Arrow Down (blue:
colder) to request the desired temperature.
You can do the same by pressing Temperatuur Continu. The abbreviation “Cont” is being
displayed, and with Up and Down you can select the desired temperature.
Pressing Start Programma ends this function.
Lighted display
Every time you press a button the display lights up for a few seconds. So even at night the
indications on the display are easy to read.
Memory Chip
The Chronotherm IV is equipped with a memory chip that keeps all adjustments. Even if
the batteries are empty the program is remembered. In that case, you’ll only have to punch
in the right time.
Temporary adjustments are not being saved.
OPTIONAL ADDITIONAL FUNCTIONS
Your Chronotherm IV is prepared for the following additional functions:
1. Reading outside temperature:
Needed: outside temperature reader (C7089B1000), wall plate* for Chronotherm IV
(Q8602A2001)
2. Switching on or off the thermostat to a preprogrammed temperature (tele-function):
Needed: an extern switchboard, used for telephones or computers (not a Honeywell-
product), wall plate* for Chronotherm IV (Q8602A2001).
3. Optimal Comfort for manual, temporary change over to outdoor temperature control
(OTC), intelligently linked to Chronotherm IV’s program.
Needed: Set Y 1019A2003 existing of:
-Smart Switch outdoor temperature controller;
-Outside temperature reader;
-Supply water temperature reader;
-Wall plate with push-button**
* Multifunctional wall plate is both suited for functions 1 and 2.
** Wall plate is also suited for installing an extra reader (C7089B1000) for reading
outside temperature and switchboard for tele-function.
N.B.: All additional functions of the Chronotherm IV are being activated using the
installers-program. Ask your installer about optional applications in your heating
installation or call Honeywell Infolijn (see last page).

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1. PROGRAMMING YOUR THERMOSTAT
You can program your Chronotherm IV either mounted on the wall plate or holding it in
your hand. The first step to make your thermostat ready for use is to program the right day
of the week, the time and the selection of Summer- or Wintertime. After this, you can
either make the device run according to the pre-programmed factory settings or you can
program your own settings. Before programming your own settings, you have to decide
whether you want to use 4 or six different periods per day. To make it easier on yourself,
it helps to write down your settings before programming.
BEWARE: only press the buttons with the tip of your finger. Sharp objects such as a
pencil may damage the buttons!
Programming the right day, time and Summer- or Wintertime
1. Press “Invoer dag/tijd”.
In the display the indications TIME, ZO or WI appear, MA and the time.
2. Press button “Day” so often till you see in the bottom of the display the abbreviation
for the right day.
3. Press buttons “Up” and “Down” (right of the display) to select the right hour.
Press buttons “Vooruit” and “Terug” to select the right minutes for the time.
Press “I” (right of the display) to set the seconds on “00”.
Selecting Summer- or Wintertime
In the left top corner of the display Summer- or Wintertime is indicated.
Press, if necessary, “Zomertijd/Wintertijd” to select the right season.
Acknowledging the new settings
Press “Start Programma” once. Settings for day and time are now activated. In the
display, time, day, room temperature and current period are being shown.
Until your personal program has been entered, the Chronotherm IV works according to
the factory settings. Now you can also program your personal settings.
The factory settings
These are the factory settings of the Chronotherm IV:
Period: Monday to Friday Saturday and Sunday
RISING 7:00 hrs 19° C 8:00 hrs 19° C
SLEEP 22:30 hrs 15° C 23:00 hrs 15° C
Before you start entering your personal settings, first you have to determine whether you
wish to use four periods per day or six. The Chronotherm IV uses four periods in the

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factory settings: RISING, LEAVING, COMING HOME and SLEEP. If these four periods
are sufficient for you, than you can skip the next step and go on to “Programming a
single day”. If you wish to use six periods per day, please follow the next instructions.
Choosing four or six periods per day
Before choosing for six periods per day, first press one of the period-buttons.
1. Press buttons “Vertrekken” en “Thuiskomen” simultaneously and keep pressed. In the
display appears VERTREKKEN or THUISKOMEN. Also, the second counter starts
running backward. As soon as the second counter stands on zero, VERTREKKEN 2
and THUISKOMEN 2 appear in the display.
2. After letting go of the buttons only the indication VERTREKKEN 2 stays in the
display. Now you can proceed with programming the six periods.
3. If, at some point, you wish to go back to 4 periods per day, then press these buttons
again. When the second counter has stopped counting backward, VERTREKKEN or
THUISKOMEN is being shown again. Now you can program four periods per day
again. Possible settings for VERTREKKEN 1 en THUISKOMEN 2 are automatically
copied to the periods VERTREKKEN en THUISKOMEN.
PROGRAMMING A SINGLE DAY
It’s not necessary to program all periods, but OPSTAAN always needs to be programmed.
You can program this period by selecting a time and a temperature.
Selecting the day you want to program
Press the button DAG a few times until the display shows the day you want to program.
With the right day selected, the current settings is being shown.
Setting the period RISING
If the display doesn’t show the period OPSTAAN yet, then press button OPSTAAN once.
In the display you will see OPSTAAN, INSTELLING, and the current settings for this
period.
Use buttons VOORUIT and TERUG to program the desired time on which you want to
start the period OPSTAAN.
Use buttons ▲and ▼ to program the desired temperature for this period.
Setting the period LEAVING (with 6 periods: VERTREKKEN 1 and VERTREKKEN
2.
Press button VERTREKKEN once. In the display you will see VERTREKKEN (or
VERTREKKEN 2).
Use buttons VOORUIT and TERUG to set the desired beginningtime of this period.
Use buttons ▲ and ▼ to set the desired temperature for this period.
The settings for period VERTREKKEN 2 can be programmed after pressing the period
button VERTREKKEN again.

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Setting the period COMING HOME (with 6 periods: THUISKOMEN 1 and 2)
Press button THUISKOMEN once. In the display THUISKOMEN (or THUISKOMEN 1)
is being shown. To get to period THUISKOMEN 2 press this button twice.
Use buttons VOORUIT and TERUG to program the desired time on which you want to
start the period.
Use buttons ▲and ▼ to program the desired temperature for this period.
Period THUISKOMEN 2 can be programmed in the same way after pressing
THUISKOMEN a second time.
Setting the period SLEEP
PLEASE NOTE: The latest you can let this period begin is 2:30 hrs. As soon as you
program this period past 0:00 hrs, the day to which the period belongs starts to flash.
Also the abbreviation of the next day shows up in the display.
Press button SLAPEN once. In the display you will see SLAPEN and INSTELLING and
the current settings.
Use buttons VOORUIT and TERUG to program the desired time on which you want to
start the period.
Use buttons ▲and ▼ to program the desired temperature for this period.
Your Chronotherm IV is now programmed for one day. You can acknowledge the
settings of this day by pressing START PROGRAMMA. The thermostat will now
function according to the program you have just entered. You best acknowledge the
settings after you have programmed all other days too.
Programming the other days of the week
To program the other days of the week, you can repeat the actions described above. If you
wish, you can also copy the whole setting to the next day. In that case, follow these
instructions:
Choose the day you wish to copy
Press button DAG until the display shows the day of which you want to copy the settings
from to the next day.
Activating the copy-function
Press button KOPIE DAG once the display the word COPY appears.
Choosing the day to which you want to copy
Press button DAG until the day appears in the display to which you want to copy the
settings. The display also shows NAAR DAG (to day) and the day to which you want to
copy starts to flash.
Copying the day-program
Press button KOPIE DAG once. In the display the day is shown to which the day-program
is copied and OK appears.

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After a few seconds the settings appear from one of the periods of the day to which the
information has been copied. If you wish, you can now go on to program other days.
Acknowledging settings and starting the program
Press button START PROGRAMMA once. The display will show the current time, day,
period and the actual temperature. Your Chronotherm IV now works according to your
own preferances.
MODIFYING YOUR PROGRAM
You can easily modify your personal settings. After altering one of more of your settings,
you can acknowledge the new settings and activate the modified program by pressing
button START PROGRAMMA once.
Modifying the period-settings
Press button DAG a few times until the display shows the day of which you want to
modify the period-settings.
Press once the button of the period you wish to change. The display will show the settings
for this period.
Press buttons VOORUIT and TERUG to alter the beginning time of the period.
Press buttons ▲and ▼to change the temperature setting of the period.
Repeat the previous steps to modify other period-settings.
Repeat the previous actions if you wish to change other period-settings.
Deleting period-settings
PLEASE NOTE: VERTREKKEN 1 THUISKOMEN 2 can only be deleted after the
periods VERTREKKEN 2 and THUISKOMEN 1 have been deleted.
You can delete all period-settings, except those of OPSTAAN.
Press button DAG until the display shows the day of which you want to delete one or
more periods.
Press the button of the period you wish to delete and keep it pressed until the settings
have disappeared from the display.
You can repeat the actions described above if you wish to delete other period-settings.
Changing from 4 to 6 or 6 to 4 periods per day
Press once one of the period-buttons in order to activate the programming-mode.
Press buttons VERTREKKEN and THUISKOMEN simultaneously and keep them
pressed. In the display VERTREKKEN or THUISKOMEN are shown from a setting of 4
periods, and VERTREKKEN 2 and THUISKOMEN 2 from a setting of 6 periods. Also
the second counter is counting down. Let go of the buttons when the second counter has
reached 0. If you go from 4 to 6 periods per day, the settings of periods VERTREKKEN
and THUISKOMEN will be copied to the periods VERTREKKEN 1 and
THUISKOMEN 2 automatically.

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When you bring back the number of periods per day from 6 to 4, the settings for
VERTREKKEN 1 and THUISKOMEN 2, then the settings of VERTREKKEN 1 and
THUISKOMEN 2 will automatically be copied to VERTREKKEN and THUISKOMEN.
Deleting your whole personal program
If you wish to delete your whole personal program, please follow these steps:
Press buttons MORGEN ALS ZONDAG and START PROGRAMMA and keep them
pressed for five seconds. In the display every segment in the display will light up. As soon
as the factory-settings of the period OPSTAAN of the current day appear in the display,
you can let go of the buttons.
Press START PROGRAMMA once. The Chronotherm IV will now work according to
the factory settings.
Now you can program your thermostat anew.
Please note: if you have changed from four to six periods per day, this change will not
be cancelled during this action.
READING THE TEMPERATURE AND CHECKING YOUR SETTINGS
You can always quickly check what temperature at a certain moment has been set. This is
possible with both temporary temperature-settings and programmed settings.
Please note: during the heating-season the temperature-setting may be shown blinking.
This may happen when the thermostat, after an economy-phase, is moving into warming-
up for the next phase. You will then see the programmed settings if the next comfort-
period, which hasn’t been reached yet.
Checking the temperature-setting
Press button “I (information)” once. For four seconds, the display will show the set
temperature with the indication “Instelling”. Afterwards the current temperature comes
back in the display.
Checking the period-settings
Press button “Dag” until the abbreviation of theday appears in the display, of which you
want to check the settings.
Then press the button of the period of which you want to change the settings.
Repeat the actions mentioned above if you wish to check more settings.
To let the thermostat resume its program, press button START PROGRAMMA once.
The display will show the time, room temperature, as well as the current day and period.
Reading the outside temperature
Please note: this function is only active if the matching outside temperature-sensor has
been installed and when it has been activated in the installers-program.

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Press button “I” twice. The display will for about four seconds show the outside
temperature with the indication BUITEN (outside). After this, automatically the current
roomtemperature will come back in the display.
Reading and setting the temperature of the tele-function
Please note: this function is only active if the necessary devices has been installed and
when this function has been activated in the installers-program.
Press button “I” three times (the telefunction-contact must be off when you do this). For
four seconds the display will show the indication TELE with a set temperature and the
indication INSTELLING.
Use the buttons ▲ and ▼to set the desired temperature. The temperature setting will be
activated at a distance by closing the tele-contact. As long as the contact is closed, the
thermostat keeps on working on the tele-temperature setting, and remains the indication
TELE visible in the display.
You can end this function by either breaking the tele-contact or by pressing START
PROGRAMMA. Now the Chronotherm IV will resume its normal program.
Please note: By switching back from the tele-function to the normal program, virtual all
temporary changes such as warmer/colder, today/tomorrow as Sunday and the holiday/
timer funtion have been cancelled. In order to re-open the tele-function, the tele-contact
has to be broken off first. As a reminder, the thermostat shows, as long as the contact has
not been broken, the indication TELE in the display.
TEMPORARILY CHANGING THE PROGRAM
Changing the temperature setting temporarily
You can alter the temperature of the current period temporarily. This temporary setting is
automatically ended when the next period starts.
Press buttons ▲ and ▼ until you see the desired temperature in the display. During
raising or lowering the temperature you will see the temperature as well as the indications
TIJDELIJK (temporary) and INSTELLING (setting) in the display.
After about four seconds after the last push on a button, the usual information pops back
on the display. In the bottom lefthand corner of the display you will see the indication
TIJDELIJK blink.
To cancell the temporary temperature setting yourself, you press START PROGRAMMA
once. The indication TIJDELIJK disappears from the display . Now your Chronotherm IV
works according toits program again.
Once-only changing the program into Sunday’s program

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You can simply transfer your settings for Sunday to any other day of the week. This can
come in handy when today or tomorrow is your day off or a holiday.
Transferring your Sunday’s setting to today
Press button VANDAAG ALS ZONDAG (today as Sunday). On the right side of the
display the indication VZ appears. From now on, the settings of Sunday will run the rest
of the day.
You can still temporarily alter the temperature setting of the Sunday-program. Use ▲ and
▼to set the desired temperature. In the display the indication TIJDELIJK will blink.
Pressing START PROGRAMMA gets your thermostat back into normal functioning.
Transferring your Sunday’s setting to tomorrow
Press button MORGEN ALS ZONDAG once. In the display the indication MZ will
appear. Sunday’s setting will now run the next day.
Please note: you can also run your Sunday’s setting for both today and tomorrow. You
do this by pressing buttons VANDAAG ALS ZONDAG and MORGEN ALS ZONDAG
simultaneously.
Cancelling Sunday’s setting for today and/or tomorrow
As soon as the thermostat changes into the day to which the Sunday setting doesn’t apply,
the Sunday settings are automatically cancelled. The abbreviations VZ and MZ will
disappear from the display.
You can also cancell the Sunday settings yourself by pressing one of the buttons
VANDAAG ALS ZONDAG and/or MORGEN ALS ZONDAG. Your Chronotherm IV
will then resume its original program.
THE HOLIDAY- AND TIMER FUNCTION
Programming the holiday-/timer function
You can make your thermostat maintain the same temperature for a number of days up to
a maximum of 99 days. This function allows you to return after a holiday or weekend off
in a home that has already been warmed up. You can even program the time of your
arrival.
You can also use this function for a few hours when you go shopping or when you are
giving a party.
Programming holidays
Press button VAKANTIE TIMER once. In the display you will see the indications
VAKANTIE, DAGEN, the temperature setting and a daycounter (00) appear. The
indication for the current day will blink.
With buttons VOORUIT and TERUG you can set the number of days you will be absent.
The day of your return will be shown blinking.
Use buttons ▲ and ▼to set the desired temperature for the holiday period.

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After about 10 seconds the room temperature appears in the display. The indication of
the day of homecoming stops blinking. The holiday program has now started. Every day
at 0.00 hrs the thermostat will count down one day. As soon as the time is down to 0.00
hrs of the day of homecoming, the thermostat will switch back to its normal program.
Programming holidays and the time of homecoming
If you also wish to program the time of coming home, you can, after programming the
holidays, activate the timer function.
Press button VAKANTIE TIMER twice. The display will show the indication TIMER
next to VAKANTIE.
Use buttons VOORUIT and TERUG to set the time on which you expect to come home.
This can be done in steps of 30 minutes.
If necessary, you can alter the number of days and the time of homecoming by pressing
button VAKANTIE TIMER again.
About 10 seconds after pressing the last button, the current room temperature will appear
in the display, and the indication of the day of homecoming wil stop blinking. The
holiday program is now started.
Please note: while setting the time of homecoming, left in the display the number of set
holidays will remain visible. Right of this you will see the time of homecoming. If you
will pass 0.00 hrs while setting, also the number of holidays as well as the day of
homecoming will change.
Please note: if the time of your homecoming is in a economy-period (such as sleeping)
your home will not be comfortably warmed up at your arrival. If you want to be sure to be
returning to a warm home, then you need to, before activating the holiday/timer function,
press button START PROGRAMMA. Using buttons ▲and ▼you can set the desired
temperature for coming home.
The you can follow the above mentioned instructions for setting this temperature for the
holiday. After coming home you press START PROGRAMMA to let the themrostat
resume its normal program.
Programming shorter periods with the timer-function
If you wish to deviate from you normal program for only a few hours, for instance when
you are throwing a party or if you are leaving home for a few hours, then with the aid of
the holiday/timer-function you can set a steady temperature until the desired time.
Press twice the button VAKANTIE TIMER. In the display the indications TIMER will
appear, plus the current time plus about one hour, and the temperature setting.
Use buttons VOORUIT and TERUG to set the time (with 30 minute-intervals) at which
you want the normal program to resume.
Use buttons ▲and ▼to set the desired temperature for the period.

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About ten seconds after the last pushing of a button, the current room temperature is
shown on the display again. When the time arrives for which you have programmed the
timer-function, your thermostat will switch back to the normal program.
Please note: if the temperature on which the thermostat should resume its normal
program is set after 0:00 hrs, then the indications “01” and VAKANTIE will appear in
the display. Also, the abbreviation of the next day will be shown blinking.
Cancelling the holiday/timer-function
Press button START PROGRAMMA once. The thermostat resumes its normal personal
program. In the display the time, room temperature, period and day will be shown.
SWITCHING SUMMER- / WINTERTIME
Switching from Summer- to Wintertime and back again
Switching from Summer- to Wintertime and back again can be done with the special
switch or by simply punching in the new time (see also: SETTING THE RIGHT
DAY/TIME).
Press button ZOMERTIJD/WINTERTIJD and keep pressed for a few seconds. In the
display you will seefirst the time and indication of the season. Then the indication for the
new season appears blinking. Also, the time moves back or forward with 10-minute
increments.
As soon as the right time appears and the season-indication stops blinking, you can let go
of the button. After a few seconds, the display switches back to showing the temperature
and the current period. The Chronotherm IV will now follow its usual program.
SETTING A STEADY TEMPERATURE
Steady temperature-setting for an undetermined period of time/manual control
(‘Temperatuur Continu’)
This function turns your programmable thermostat into a ‘normal’ one. In this mode, your
program is being ignored in favour of a temperature you can set with the buttons
WARMER and COLDER. This function can come in handy when you are gone for a
certain period of time and don’t know when you come back, and still wish to maintain a
certain temperature.
- Press TEMPERATUUR CONTINU once. In the display you will see CONT and
INSTELLING and the current temperature setting.
- Use WARMER and COLDER to set your desired temperature. After a few seconds, the
current temperature comes back on the display.
Ending TEMPERATUUR CONTINU

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Press START PROGRAMMA once. In the display appear the time, current temperature,
and indication of day and period. Your thermostat will resume normal functioning
according to program.
MAINTAINING YOUR THERMOSTAT
Taking the thermostat off the wall plate
1. Turn off the screw on the bottom of the thermostat (not every thermostat is fitted onto
the wall plate like this).
2. Carefully pull the thermostat loose by pulling it from the underside towards you.
3. Pull it from the ridges on the top towards you.
Placing the thermostat back onto the wall plate
1. Hook the thermostat with its nodges onto the ridges on the upper side of the wall
plate.
2. Carefully let the underside of the thermostat fall back onto the wall plate. The steel
epins are supposed to slide easily into the thermostat. Please do this with care.
Forcing the thermostat onto the pins may damage the thermostat. Gently push until
you hear a click.
3. Fasten the screw back into the underside of the thermostat – this is optional, though.
Replacing the batteries
Chronotherm IV works with three AA alkaline Penlite-batteries. When the display reads
VERV BAT you need to replace the batteries. You will have approximately 2 months
before the batteries are completely dead.
When the batteries are completely dead the display will show nothing. You will need to
replace the batteries. In most cases you will need to reprogram the day and time.
When you replace the batteries before they are completely dead, you have 30 seconds to
do so without risking to lose the set time and day.
To replace the batteries:
1. Take the thermostat off the wall plate as described above.
2. Take the old batteries out of the battery compartment.
3. Place back the new batteries.
4. Place back the thermostat back onto the wall plate as described above.
5. If need be, set the time and day.
Please dispose of your old batteries as chemical disposables.
Please note: the lifespan of batteries inside the Chronotherm IV is dependable of the
quality and technical specifications of the batteries. Rechargeable batteries are not
recommended to use in the Chronotherm IV!
TROUBLE SHOOTING

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During warming up, the set temperature is too high and is shown blinking.
This is normal. While warming up, the thermostat shows the temperature setting of the
next period, usually blinking, when pressing the Information-button.
Changes in the temperature setting at the wrong time
- Check if the programmed time- and temperature-settings are correct, and if necessary
change them.
- Please take into account that heating up begins before the programmed time for this
same period is reached. This creates a nice, comfortable temperature at the start of this
period.
The heater does not start
- The fuse in the heater broke down, and needs to be replaced. If the heater still does not
work, call the company who installed or maintains your heater.
- If the display of the thermostat is empty or shows VERV BAT, change the batteries.
- If the set temperature is higher than the current temperature and the display shows the
flame-saymbol (meaning the heater should start), then call the company who installed or
maintains your heater.
The heater starts and stops too often
The response time of the heater does not match the properties of the thermostat. Possibly
you need to set the number of cycles per hour differently (if this is the case, please call
Honeywell Infolijn for instructions at 020 – 56 56 392).
The temperature in your home is too high or too low
- Press the INFORMATION button once to check the set temperature.
- In you wish, change the temperature temporarily using the WARMER or COLDER
button.
For all your questions about your thermostat please call:
e-mail: [e-mail]

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