Tech Controllers EU-28N Bedienungsanleitung

EU-28N

 

 
TABLE OF CONTENTS 
1Safety .......................................................................................................................................................................................... 4 
2Device description....................................................................................................................................................................... 5 
3Installing the Controller .............................................................................................................................................................. 5 
4Controller operation ................................................................................................................................................................... 7 
5Controller functions –Main Menu.............................................................................................................................................. 7 
1 Firing up/ Extinguishing..................................................................................................................................................... 8 
2 Screen view ....................................................................................................................................................................... 8 
3 Temperature settings ........................................................................................................................................................ 8 
3.1 CH set temperature....................................................................................................................................................... 8 
3.2 DHW set temperature................................................................................................................................................... 8 
4Work setting...................................................................................................................................................................... 8 
4.1 Blowing force ................................................................................................................................................................ 8 
4.2 Fan in maintaining......................................................................................................................................................... 8 
4.3 Maintaining time........................................................................................................................................................... 8 
4.4 Fan speed in maintaining .............................................................................................................................................. 9 
5 Manual operation.............................................................................................................................................................. 9 
6 Pump operating mode....................................................................................................................................................... 9 
6.1 Heating.......................................................................................................................................................................... 9 
6.2 Boiler priority ................................................................................................................................................................ 9 
6.3 Parallel pumps............................................................................................................................................................... 9 
6.4 Summer mode............................................................................................................................................................... 9 
7 Time settings ................................................................................................................................................................... 10 
8 Date settings.................................................................................................................................................................... 10 
9 Weekly schedule control ................................................................................................................................................. 10 
10 Installer menu.................................................................................................................................................................. 11 
11 Service menu................................................................................................................................................................... 11 
12 Language selection .......................................................................................................................................................... 11 
13 Factory settings ............................................................................................................................................................... 11 
14 Software version.............................................................................................................................................................. 11 
6Controller functions –Installer Menu....................................................................................................................................... 12 
1 Reduction by the room controller................................................................................................................................... 12 
2 Room controller............................................................................................................................................................... 12 
2.1 CH pump control ......................................................................................................................................................... 12 
2.2 Boiler control............................................................................................................................................................... 12 
3 Pump switch-on temperature ......................................................................................................................................... 13 
4 DHW hysteresis ............................................................................................................................................................... 13 
5 Disinfection of the boiler................................................................................................................................................. 13 
6 Anti-stop for pumps ........................................................................................................................................................ 13 

 
3 
 
6.7 Antifreeze temperature................................................................................................................................................... 13 
6.8 Boiler hysteresis .............................................................................................................................................................. 14 
6.9 Screen setup.................................................................................................................................................................... 14 
6.10 Display contrast............................................................................................................................................................... 14 
6.11 Factory settings ............................................................................................................................................................... 14 
7Protections................................................................................................................................................................................ 14 
7.1 Temperature alert ........................................................................................................................................................... 14 
7.2 Thermal protection.......................................................................................................................................................... 14 
7.3 Automatic sensor control................................................................................................................................................ 15 
7.4 Boiler boiling water protection ....................................................................................................................................... 15 
7.5 Temperature protection.................................................................................................................................................. 15 
7.6 Fuse ................................................................................................................................................................................. 15 
8Technical specifications ............................................................................................................................................................ 15 
 
PS, 02.02.2023 
ALL IMAGES PUBLISHED SERVE ILLUSTRATION ONLY AND MAY DIFFER FROM THE ACTUAL APPEARANCE. 
 
 
 
EU DECLARATION OF CONFORMITY 
Hereby, we declare under our sole responsibility that EU-28N manufactured by TECH STEROWNIKI, head-quartered in 
Wieprz Biała Droga 31, 34-122 Wieprz, is compliant with Directive 2014/35/EU of the European Parliament and of the 
Council of 26 February 2014 on the harmonisation of the laws of Member States relating to the making available on 
the market of electrical equipment designed for use within certain voltage limits (EU OJ L 96, of 29.03.2014, p. 357), 
Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the 
laws  of  Member  States  relating  to  electromagnetic  compatibility  (EU  OJ  L  96  of  29.03.2014,  p.79),  Directive 
2009/125/EC establishing a framework for the setting of ecodesign requirements for energy-related products as well 
as the regulation by the MINISTRY OF ENTREPRENEURSHIP AND TECHNOLOGY of 24 June 2019 amending the regulation 
concerning the essential requirements as regards the restriction of the use of certain hazardous substances in electrical 
and electronic equipment, implementing provisions of Directive (EU) 2017/2102 of the European Parliament and of 
the Council of 15 November 2017 amending Directive 2011/65/EU on the restriction of the use of certain hazardous 
substances in electrical and electronic equipment (OJ L 305, 21.11.2017, p. 8). 
For compliance assessment, harmonized standards were used: 
PN-EN IEC 60730-2-9:2019-06, 
PN-EN 60730-1:2016-10, 
EN IEC 63000:2018 RoHS. 
 
 
Wieprz, 02.02.2023 
 

1SAFETY

Before operating the device please read the following instructions carefully. Failure to observe these instructions may cause

personal injuries and damage the device.

To avoid unnecessary errors and accidents, make sure that all persons operating the device are thoroughly familiarized with its

operation and safety functions. Please retain the operating manual for future reference and make sure that it stays with the device

if it is transferred or sold, so that everyone using it will have sufficient information concerning the operation and safety of the

device. For the safety of life and property, take precautions in accordance with the user manual, as the manufacturer is not

responsible for damage caused by negligence.

WARNING

•Live electrical equipment. Before carrying out any operations related to the power supply (connecting cables,

installing the device, etc.), make sure that the controller is not connected to the mains.

•Installation should be carried out by a person holding appropriate electrical qualifications.

•Before starting the controller, the ground resistance of electric motors and the insulation resistance of electric wires

should be measured.

•The controller is not intended to be operated by children.

CAUTION

•Atmospheric discharges can damage the controller, so during a thunderstorm, switch it off by unplugging the mains

plug.

•The controller may not be used contrary to its intended purpose.

•Before and during the heating season, check the technical condition of the cables. Also check the installation of the

controller, clean dust and other soiling.

There could be changes introduced in the products listed in the present manual, following its last revision of 02.02.2023. The

manufacturer reserves the right to introduce design changes. Illustrations may contain optional equipment. Printing technology

may affect differences in the presented colours.

Care for the natural environment is of paramount importance to us. The awareness that we

manufacture electronic devices is linked with our obligation to dispose the used electronic parts

and devices in a way that is safe for the environment. Therefore, the company received a

registration number issued by the Polish Chief Inspector for Environmental Protection. The symbol

of the crossed wheeled bin on the product indicates that the product must not be disposed of with

municipal waste. By segregating waste for recycling, we help protect the environment. It remains

the user's responsibility to hand over used equipment to a designated collection point for recycling

electrical and electronic equipment waste.

2DEVICE DESCRIPTION

The EU-28N controller is designed for CH boilers. It controls the CH water circulation pump, DHW domestic hot water pump

and blowing (fan). If the boiler temperature is lower than the set temperature, the controller is in the operating cycle, in which

the blower operates at all times.

If the boiler temperature is equal to or higher than the set temperature, then the controller is in the temperature maintaining

cycle, and the controller works by switching on the purges at a frequency depending on the user's settings. The duration of

operation and interruptions of purges in the maintaining cycle should be selected according to the type of fuel burned in the

boiler.

CAUTION

Each controller must be set individually, depending on the type of fuel used in the boiler, and also the type of boiler. TECH

is not responsible for incorrect controller settings.

In case of voltage loss, the thermoregulator will stop working. After the power supply is reconnected, the controller returns to

operation with previously set parameters thanks to its built-in memory. Lack of power supply does not delete the stored

thermoregulator parameters.

3INSTALLING THE CONTROLLER

The controller should be installed by a properly qualified person only.

WARNING

Danger of injury or death due to electric shock on live connections. Before working on the controller, disconnect its power

supply and secure it against accidental switching on.

CAUTION

Incorrect wiring may damage the controller.

In the back of the controller there are connectors to which sensors and devices operated by the controller should be connected:

4CONTROLLER OPERATION

1. UP button - changes the set temperature from the main screen view, after entering the controller menu, this

button is used to increase the operating settings.

2. DOWN button - changes the set temperature from the main screen view, after entering the controller menu,

this button is used to reduce the operating settings.

3. Entering the controller menu, confirming the settings.

4. Power switch.

5. Exit from the controller menu, cancel settings.

5CONTROLLER FUNCTIONS –MAIN MENU

MAIN

Firing up/ Extinguishing

Screen view

Temperature settings

Work setting

Manual operation

Pump operating mode

Time settings

Date settings

Weekly schedule control

Installer menu

Service menu

Language selection

Factory settings

Software version

5.1 FIRING UP/EXTINGUISHING

After the initial ignition of the boiler, the Ignition function must be activated. In this mode, the fan will start working to facilitate

ignition (in a still cold boiler). Once the CH temperature rises to 30°C (the so-called fan threshold), the Fan On/ Off function will

appear on the display instead of the Ignition option and the Manual Operation diode will turn off and the boiler will enter the

operating mode. Using the Fan On/ Off function, the fan can be switched on or off (e.g. when adding fuel). Turning off the fan is

indicated by an asterisk on the main screen in the lower right corner of the display. This function allows for safe operation of the

boiler. Never open the furnace door with the fan on. If the boiler reaches a temperature of 35°C, the pump (or both pumps

depending on the operating mode) will start.

5.2 SCREEN VIEW

In this function, the user can select one of the available main screens of the thermoregulator operation. These are:

•CH screen (the current boiler operating mode is displayed)

•Service screen (allows you to view the parameters available in the service menu)

5.3 TEMPERATURE SETTINGS

5.3.1 CH SET TEMPERATURE

This option is used to set the boiler temperature. The user can change the boiler temperature range from 40OC to 80OC. The set

CH can also be changed directly from the main screen of the controller.

5.3.2 DHW SET TEMPERATURE

This option is used to set the set temperature of domestic hot water. The user can adjust this temperature in the range from 35OC

to 60OC.

5.4 WORK SETTING

MAIN

WORK

SETTING

Blowing force

Fan in maintaining

Maintaining time

Fan speed in maintaining

5.4.1 BLOWING FORCE

This function controls the fan speed. The adjustment range is from 1 to 100%, (it can be assumed that these are fan speeds). The

higher the speed, the faster the fan works, where 1% is the minimum fan speed and 100% is the maximum.

5.4.2 FAN IN MAINTAINING

In this function, the user sets the running time and the fan pause time during the operation in the temperature maintaining cycle.

5.4.3 MAINTAINING TIME

This option is used to set the fan idle time during the maintaining period.

CAUTION

Incorrect setting of this option may cause a constant increase in temperature! The maintaining interval should not be

too short.

5.4.4 FAN SPEED IN MAINTAINING

This option allows you to select the appropriate fan speed (blowing power) in maintaining cycle.

5.5 MANUAL OPERATION

For the convenience of the user, the controller has been equipped with a Manual Operation module. In this function, each

actuator (fan, CH pump, DHW pump) is switched on and off independently of the others.

Pressing the OPTIONS button starts the motor of the selected device. This device remains running until the OPTIONS button is

pressed again.

The blowing speed option is also available, enabling the user to set any fan speed in manual operation.

5.6 PUMP OPERATING MODE

In this function, the user selects one of the available boiler operation modes.

MAIN

OPERATING

MODE

Heating

Boiler priority

Parallel pumps

Summer mode

5.6.1 HEATING

After selecting this option, the controller enters the "only heating" state. The CH pump will start operating above the CH pump

start-up temperature. Below this temperature (minus the hysteresis value) the pump stops working.

5.6.2 BOILER PRIORITY

In this mode, the DHW pump operates until the boiler is heated (the valves close to the maximum and the valve pumps are

switched off). At the moment of obtaining the set temperature on the boiler, the previously operating pump will be switched off,

while the CH pump will be switched on and the mixing valves will be switched on. The moment the boiler temperature drops

below the set point temperature by the hysteresis value, the DHW pump will switch on again and the valves will stop working.

CAUTION

The boiler should have check valves installed in the CH and DHW pump circuits. The valve mounted on the DHW pump

prevents the extraction of hot water from the boiler. The valve mounted on the circuit of the CH pump does not let the

hot water that heats the boiler to the home heating system.

5.6.3 PARALLEL PUMPS

Mode in which the CH pump operates above the pump start-up threshold. The DHW pump switches on in parallel and reheats the

boiler, while after reheating the DHW, the pump switches off. The pump will restart after the temperature drops by the DHW

hysteresis value.

CAUTION

If the boiler's current temperature is lower than the current temperature on the boiler, the DHW pump will not switch

on to protect against cooling of the boiler water.

5.6.4 SUMMER MODE

When this function is activated, the CH pump is switched off and the DHW pump is switched on above the pump switch-on

threshold. When the threshold temperature is exceeded, the DHW pump operates all the time until the boiler temperature drops

below the pump start-up threshold (by DHW hysteresis value). In the summer function, only the set temperature of the DHW

vessel is set, which is also the set temperature of the boiler.

5.7 TIME SETTINGS

Time settings are used to set the current time.

5.8 DATE SETTINGS

Used to set the current date.

5.9 WEEKLY SCHEDULE CONTROL

The function allows you to program deviations of the boiler set temperature (submenu Boiler week) on individual days of the week

at specific times.

CAUTION

For the correct operation of this function it is necessary to set the current date and time.

To enable weekly control, select and check Mode 1 or Mode 2. Detailed settings of these modes can be found in the following

sections of the submenu: Set Mode 1 and Set Mode 2.

When one of the modes is activated, a digit with the value of the currently set deviation will be displayed on the main page of the

controller, below the set temperature (alternatively with the inscription Set) (at the same time informing about the active weekly

control).

Changing weekly control settings:

In the EU-28N controller, you can program the weekly control in two different modes:

MODE 1 - in this mode it is possible to program deviations of the set temperature for each day of the week separately.

MODE 2 –in this mode, the user programs temperature deviations for weekdays (Monday –Friday) and for the weekend (Saturday

–Sunday).

Mode 1 programming:

To program mode 1, the user starts the Set mode 1 parameter –a screen with individual days of the week appears on the display.

After selecting the day of the week the settings of which we wish to change, the edit screen appears: the current deviation setting

is displayed in the upper line and the lower displays the time interval. Use the UP/DOWN buttons to navigate to the next time

frame. To edit a setting, click OPTIONS, and then click Change.

To copy the settings for the subsequent hours, set the parameter, and then select the Copy function.

Example

Monday

settings: 3 00, temp -100C (weekly control setting: –100C)

settings: 4 00, temp -100C (weekly control setting: –100C)

settings: 5 00, temp -100C (weekly control setting: –100C)

In this case, if the setpoint temperature on the boiler is 600C, then from 300 hours on Monday to 600 hours the setpoint temperature

on the boiler will drop by 100C, i.e. it will be 500C.

Mode 2 programming:

To program mode 2, the user starts the Set mode 2 parameter –the display shows a screen with two intervals for days of the

week: Monday –Friday and Saturday - Sunday. After selecting the interval that we want to change, we go to their editing –a

procedure such as in the mode 1 programming.

Example

Monday-Friday

settings: 3 00, temp -100C (weekly control setting: –100C)

settings: 4 00, temp -100C (weekly control setting: –100C)

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