EUROSTER 2026 Manuel utilisateur

EUROSTER 2026/2026TX - User Manual 1

EUROSTER 2026/2026TX

1. CHARACTERISTICS

•4 different programs for each day of the week (28 different ranges and

temperatures altogether). Time programming with 10 minutes accuracy.

•Designed to operate in heating or air conditioning systems.

•Temperature measurement range 0-50 °C, resolution of 0.1 °C.

•Temperature control range 5-45 °C, resolution 0.2 °C.

•Hysteresis selectable from 0.5 / 1.0 / 2.0 / 4.0 °C.

•PI - system for heating curve optimization.

•Sensor calibration from -4.0 °C to 4.0 °C, step 0.2 °C.

•Program copy function.

•Large, clear backlit display.

•Temporary temperature change - the controller instantaneously maintains the

preset temperature until the next program starts.

•Holiday mode - the controller maintains the preset temperature for a selected

time up to 99 days.

•Settings lock - the option to change parameters is blocked. This mode is intended

for offices where only 1 person is entitled to change the settings.

•No heating, i.e. the Anti-freeze mode - the mode of heating in which the

controller maintains the lowest possible and safe temperature (5 °C); in air

conditioning mode the cooling device is disabled.

•Operating time counter of the heating / air conditioning device - maximum

indication 999 hours, with a resolution of 1 minute.

•Ant-freeze protection - the controller turns heating on when the temperature

drops below 5 °C. This function is always active.

•Power supply 2 AA alkaline batteries.

•Output load 16 A 230 V AC, 1-pole changeover relay.

•External temperature sensor - NTC 10kΩ at 25 °C.

•Automatic switch between summer and winter time.

•Anti-stop system - the relay is switched on for 1 minute once a week.

•Dimensions (L / H / W.) 132.5 x 85 x 27.6 mm.

CE declaration of conformity is available on the website http //www.euroster.com.pl

EUROSTER 2026/2026TX - User Manual 2

2. PROPER PLACE FOR INSTALLATION

To ensure fully efficient controller operation, please observe the following recommendations

regarding the placement of the device.

1. The controller is designed for indoor wall mounting at a height of about 1.5 m

above the floor.

2. Avoid places with strong sunlight, near heating or cooling equipment, directly by

the doors, windows and other such locations where the temperature

measurement could be easily disturbed by external conditions.

3. Avoid areas with poor air circulation, such as behind furniture.

4. Avoid wet areas due to the negative effects of moisture on the service life of the

device.

5. Prior to installation, make sure that all repair/restoration works in the room have

been completed and the installation place is not covered with fresh paint or

plaster.

6. Levelling of the regulator is not necessary.

7. Slip excess cables back into the wall during the tuning of the device placement. In

case of draught, any gap should be filled non-combustible substance.

8. Insert the batteries, observing correct polarity.

N te! Charge a qualified installer with the installati n f the c ntr ller. D n t

install the regulat r sh wing any mechanical damages.

3. OUTSIDE VIEW OF THE CONTROLLER

BODY

• and increase / decrease, press and hold to quicken the change.

• press to display the current date, press and hold for 3 seconds to set the

date and time.

• toggles Anti-freeze mode (5 °C).

• press to display the operating time, press and hold for 3 seconds in order to

reset, to confirm press the key .

• toggles Holiday mode.

• press to select the program that will be copied.

• confirmation.

EUROSTER 2026/2026TX - User Manual 3

N te: Upon changing any value the corresponding item on the display starts blinking. This

should be understood as a request for confirmation. If the users approves the change with

the confirmation button, it will be stored. If not confirmed within 15 seconds, the controller

cancels the changes and returns to normal operation.

DISPLAY

•“Date”- shows the current date (not time).

•1,2,3, ... 7 - day of the week, 1 = Monday, 7 = Sunday.

•Number on the left side - temperature (measured or preset).

•°C - degrees Celsius.

•“SET” - change the settings.

•Number on the right side - time current, preset or operating time (when

measuring operating time), range 00 00 - 999 59.

1st Program

2nd Program

3rd Program

4th Program

Heating on

Air Conditioning on

Time counter

(heating / air conditioning app iance)

Anti-freeze mode 5 °C

Copy function active

Battery exhausted

Ho iday mode

Thermostat ocked

Manua mode (preset temperature is maintained ti the next program change)

EUROSTER 2026/2026TX - User Manual 4

4. OPENING THE CONTROLLER AND BATTERY REPLACEMENT

Insert a flat screwdriver into the gap as shown in the figure below. Lever the lid up gently in

the direction of the front panel.

After opening the controller, insert the included batteries. Only alkaline batteries, size R6

(AA) are allowed. In particular, do not use rechargeable batteries, because (due to self-

discharge) their effective time is shorter than the alkaline batteries’ one.

To avoid negative surprises, it is recommended to replace the batteries each year before the

heating season begins.

5. CONTROLLER MODE SELECTION

Euroster 2026 is equipped with 4 configuration jumpers. Factory settings are indicated in

italics

Installati n Type: Air C nditi n / Heating

Jumper used to select the type of installation, in which the regulator is used.

Ch ice f sens r: Internal / External

Jumper used to select the sensor internal (air temperature measured where the controller is

installed) or external (requires connection of an external sensor)

Type f alg rithm: ON-OFF / P.I.

The controller can operate either in an on-off mode, in which the controller alternately turns

the heating (cooling) device on and off or in the PI mode, in which the controller smoothly

regulates the degree of heating (cooling).

Pr tecti n against verheating caused by the discharge f the batteries: YES / NO

If the batteries are discharged, the controller may switch the relay off in emergency state

(protection against uncontrolled operation of the heating appliance). Disabling this feature

causes the controller to operate without change until the battery is discharged (risk of

heating being permanently turned on).

EUROSTER 2026/2026TX - User Manual 5

6. CONTROLLER WIRING DIAGRAM

In a system with a gas boiler

In an underfloor heating system

NOTE. If you use a floor sensor, connect it to the terminals 4 and 5. The SENSOR jumper

should also be put in the Ext position (batteries should be taken out during this procedure).

In a heating / air conditioning system

EUROSTER 2026/2026TX - User Manual 6

7. SETTING PARAMETERS

Setting date and time

Note the user can confirm the settings in two ways by using keys or .

Confirmation with the key causes a jump to the next setting (Hour > Minute > Year >

Month> Day > Hour (again)). If confirmed with , the controller will store the change and

return to operation.

If no key is pressed for 15 seconds, the change of setting is cancelled.

To set date and time, follow these steps

1. Press and hold the button for 3 seconds - the hour digits will flash.

2. Using and set the time. Confirm with the key. The minute digits will

start flashing.

3. Repeat the steps for setting minutes, year, month and day.

4. After setting the day of the month confirm all changes hitting the key or push

the key to return to the settings and adjust entered values.

Setting Hysteresis (f r ON-OFF alg rithm nly)

1. Hold and for at least 3 seconds. The controller displays the word

"Hysteresis" and shows the current setting.

2. Select the desired value with the and keys.

3. Confirm with the key or wait 15 seconds until the change is cancelled.

The idea behind the regulator’s operation with hysteresis is presented below

Alg rithm ptimizing the heating curve (PI)

The controller 2026 can operate using an algorithm optimizing the heating curve. This

algorithm is intended for installations with water underfloor heating. Its aim is to minimize

room temperature fluctuations.

As opposed to the on / off regulation, current status of the relay depends not only on the

current difference between the preset and the measured temperature, but also on past

temperature changes. For example, if the measured temperature is lower than the preset

one for a long time, the controller turns the heating device permanently on.

In order to use the PI mode, its parameters must be set

Minimum durati n f activity ("C n") 1-5

Means the minimum time for which that the controller switches the relay on, in one cycle.

Number f cycles per h ur ("CPH") 3,6,9,12

Number of switching cycles per hour. The times of activation and deactivation are calculated

by the controller.

EUROSTER 2026/2026TX - User Manual 7

Range f pr p rti nal c ntr l width ("Pb") 1.5-3.0

If the difference between the preset and the measured temperature is in the range of

proportional control, the controller calculates the times of activation and deactivation.

Outside this range, the output is turned on or off continuously.

Setting the parameters f PI alg rithm

1. Hold and together for at least 3 seconds. The controller displays the word

"Con" and shows the current setting.

2. Select the desired value with the keys and .

3. Confirm with the key or wait 15 seconds until the change is cancelled.

4. Repeat steps 2-3 for setting "CPH" and "Pb".

Adjustment f measured temperature (calibrati n)

Range of calibration from -4.0 °C to 4.0 °C.

1. Set the knob in the PN position.

2. Hold down the keys and simultaneously for at least 3 seconds. The

controller will show the current value of the adjustment.

3. Set the desired correction with the keys and . Step of the change is 0.2 °C.

4. Confirm with the key or wait 15 seconds to cancel the change.

8. CONTROLLER’S OPERATION

Euroster 2026 is a programmable regulator. The user can set up 4 different temperatures for

4 different intervals of time, for each day of the week separately. Setting up programs for

the entire week can be laborious; the controller is therefore equipped with the function of

copying programs.

There are 2 settings for each program temperature and start time which also means the

end of the previous program.

During the activity of the program its assigned preset temperature is maintained.

Start time of the program is determined with an accuracy of 10 minutes. Range 00 00 -

23 50.

The programs are always executed in the order P1-P2-P3-P4. It is possible to set the start

times of programs in a different order than the P1-P2-P3-P4, but in this case the regulator

omits programs that overlap.

Example:

P1-4 start in sequence, the user wants P4 to begin before P3

If P4 starts before P3, the controller automatically bypasses P3. As a result, we have

Similarly, if a user wants to move the P2 and P3 "behind" P4

Programs P2 and P3 are skipped (P4 starts before P2 and P3)

EUROSTER 2026/2026TX - User Manual 8

Pr gramming the c ntr ller

N te: The order of weekdays is irrelevant during programming.

1. Set the knob at PN position.

2. Set the desired temperature for P1 with the keys and . Confirm with the

key .

3. Set the required start time for P1 with the keys and .Confirm with the key

4. Set the desired temperature for P2 with the keys and .Confirm with the

key .

5. Set the required start time for P2 with the keys and .Confirm with the

key .

6. Similarly set temperature and time for programs P3 and P4 .

7. After setting all parameters set the knob at the next day of the week (e.g. Tuesday).

8. Set the parameters for all programs for the next day.

9. In the manner described above, set parameters for all programs for all consecutive

days, or copy the programs (see p. 14).

10. Set the knob in the START position. The controller will start to operate according to

the new settings.

C pying Pr grams

First, parameters for the selected programs for one day must be set, as described above.

In the following description the program from Monday is copied to Tuesday, Thursday and

Friday.

1. After setting the program for Monday (knob still at PN), press the key .

2. The display indicates that the source of the program will be Monday

Note Re-pressing the key will exit the Copy mode.

3. Select any day of the week with the knob, to which the program from Monday is to

be copied, for example Tuesday.

4. The display will indicate that the program will be copied to Tuesday digit 2 will blink.

5. Press to copy the program. Digit 2 stops flashing.

6. Set the knob at the next day of the week, to which the program is to be copied from

Monday, for example Thursday.

7. The display will indicate that the program is to be copied to Thursday digit 4 will

blink.

EUROSTER 2026/2026TX - User Manual 9

8. Press to copy the program. Digit 4 stops flashing.

9. Similarly, set knob at Friday and then press ; program will be copied.

10. Set the knob in the START position. The controller will begin to operate normally.

H liday m de

In holiday mode the controller does not run any program, but maintains the preset constant

temperature instead. The user sets how many hours or days the preset temperature should

be maintained.

Resolution of time setting is 1 hour (in the range of up to 2 days) or 1 day (range 3-99

days). There is also a possibility to set infinite time, in which case the holiday mode must be

terminated manually.

Imp rtant: Activating the holiday mode must be confirmed with the button. The

display shows the symbol . Leaving the controller for more than 15 seconds causes

cancellation of the setting and return to normal operation.

Setting the holiday mode

1. Set the knob in START position and press the key . The controller proceeds to

setting the temperature - the temperature indication starts to flash. Set the desired

temperature with the keys and , to confirm press the key or .

2. The display will show

- on the left side the duration of holiday mode

- on the right side time or date of termination of holiday mode

Set the duration of holiday mode with the keys and .

3. The maximum number of hours is 48. Above this value the number of days is

selected. The number on the right side means in this case the date (the display

shows the word "Date" and the designation of days of the week.

There is also a possibility to set infinite time for the holiday mode.

4. After entering the setting procedure for the length of holiday mode, the display shows

"1h". The sequence of changes is as follows

"-" indicates an infinite length, in this case the holiday mode can be terminated only

manually.

5. After setting the interval, confirm with the key .

Back t n rmal perati n

The controller returns to its normal operation automatically at specified time. If the interval

was expressed in days, the return will be performed at midnight of the selected day (i.e. at

its beginning).

For example, if the user plans to return on Sunday, the controller will turn the heating on at

midnight on Sunday so as to reach normal room temperature before the user returns.

If infinite time was selected, holiday mode must be terminated manually.

In any event, holiday mode can be deactivated with the key .

EUROSTER 2026/2026TX - User Manual 10

Designati n f h urs / days

If specified time is expressed in hours, the letter "h" is displayed after the number; if in days

- the display shows "d" and word "Date" appears above the number on the right.

Temp rary temperature change

In contrast to the holiday mode, no duration is set in the procedure of temporary

temperature change. This mode is active until the next program starts.

To activate this feature, define the preset temperature with the buttons and . After 3

seconds it will be stored. You can also confirm the setting with the key . The display will

show the symbol.

Examp e:

P1 maintains a temperature of 20 °C from 9 00 am, P2 - 21 °C from 14 00. At noon the

user activates the temporary temperature change at 15 °C. The target temperature will be

09 00 ÷ 12 00 - 20 °C

12 00 ÷ 14 00 - 15 °C

14 00 ÷ ........ - 21 °C

This feature can be deactivated by turning the knob onto any day of week, then back to

START.

Anti-freeze m de (standby)

In the anti-freeze mode, the controller is configured for maximum energy saving. If it

regulates air conditioning, it is turned off. If the controller regulates heating, it maintains the

minimum controllable temperature (5 °C) in order to prevent the installation from freezing.

To activate this feature, press and hold for more than 3 seconds. The display contents

disappear, there remain only the measured temperature, the symbol of power and the

letters A-F, meaning Anti-freeze mode.

To deactivate this feature, the user must press the key for at least 3 seconds again.

C ntr ller settings l ck

The controller is equipped with a function for locking the settings. The activation of the lock

is indicated by the symbol . In this case no settings can be changed. However, they can

still be displayed.

Locking the controller

1. Set the knob in the position "SOB".

2. Hold the keys and together for at least 3 seconds. After 3 seconds the

regulator will be locked, and the display will show the symbol.

3. Set the knob in the position "START".

Unlocking the controller is done in the same way.

Locking the settings does not affect the controller’s operation.

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