Tech Controllers EU-M-12 User manual

EU-M-12

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TABLE OF CONTENTS
I. Safety..............................................................................................................................................................................5
II. Description of the device................................................................................................................................................6
III. Installing the Controller..................................................................................................................................................6
IV. First startup ....................................................................................................................................................................8
V. Main screen description.................................................................................................................................................9
1. Main screen....................................................................................................................................................................9
2. Zone Screen....................................................................................................................................................................9
VI. Controller functions......................................................................................................................................................12
3. Operation mode ...........................................................................................................................................................12
3.1. Normal mode.......................................................................................................................................................12
3.2. Holiday mode.......................................................................................................................................................12
3.3. Economy mode....................................................................................................................................................12
3.4. Comfort mode .....................................................................................................................................................12
4. Zones ............................................................................................................................................................................13
5. Controller settings........................................................................................................................................................13
5.1. Time settings........................................................................................................................................................13
5.2. Screen settings.....................................................................................................................................................13
5.3. Protections...........................................................................................................................................................13
5.4. Sound the buttons ...............................................................................................................................................13
5.5. Alarm sound.........................................................................................................................................................13
6. Software version...........................................................................................................................................................13
7. Fitter’s menu ................................................................................................................................................................14
7.1. Master module ....................................................................................................................................................14
7.2. Additional modules..............................................................................................................................................18
7.3. Zones ...................................................................................................................................................................19
7.4. External sensor ....................................................................................................................................................19
7.5. Heating stopping..................................................................................................................................................20
7.6. Anti-stop settings.................................................................................................................................................20
7.7. Maximum humidity .............................................................................................................................................20
7.8. DHW settings .......................................................................................................................................................20
7.9. OpenTherm..........................................................................................................................................................21
7.10. Language..............................................................................................................................................................21
7.11. Repeater Function ...............................................................................................................................................21
7.12. Factory settings....................................................................................................................................................21
8. Service menu................................................................................................................................................................22
9. Factory settings ............................................................................................................................................................22
VII. Software update...........................................................................................................................................................22

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VIII. Alarms...........................................................................................................................................................................22
IX. Technical specifications................................................................................................................................................22
JG. 31.03.2023
Images and diagrams contained in the document serve illustrative purposes only.
The manufacturer reserves the right to introduce changes.

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I. SAFETY
Before using the device for the first time the user should read the following regulations carefully. Not obeying the rules
included in this manual may lead to personal injuries or controller damage. The user’s manual should be stored in a safe place
for further reference. In order to avoid accidents and errors, it should be ensured that every person using the device has
familiarized themselves with the principle of operation as well as security functions of the controller. If the device is to be
put in a different place, make sure that the user’s manual is stored with the device so that any potential user has access to
essential information about the device. The manufacturer does not accept responsibility for any injuries or damage resulting
from negligence; therefore, users are obliged to take the necessary safety measures listed in this manual to protect their lives
and property.
WARNING
•High voltage! Make sure the regulator is disconnected from the mains before performing any activities
involving the power supply (plugging cables, installing the device etc.)
•The device should be installed by a qualified electrician.
•Before starting the controller, the user should measure earthing resistance of the electric motors as well as the
insulation resistance of the cables.
•The regulator should not be operated by children.
WARNING
•The device may be damaged if struck by a lightning. Make sure the plug is disconnected from the power supply
during storm.
•Any use other than specified by the manufacturer is forbidden.
•Before and during the heating season, the controller should be checked for condition of its cables. The user
should also check if the controller is properly mounted and clean it if dusty or dirty.
Changes in the products described in the manual may have been introduced subsequent to its completion on 31.03.2023.
The manufacturer retains the right to introduce changes to the structure or colours. The illustrations may include additional
equipment. Print technology may result in differences in colours shown.
Care for the natural environment is our priority. Being aware of the fact that we manufacture
electronic devices obligates us to dispose of used elements and electronic equipment in a
manner which is safe for nature. As a result, the company has received a registry number
assigned by the Main Inspector of Environmental Protection. The symbol of a crossed out rubbish
bin on a product means that the product must not be thrown out to ordinary waste bins. By
segregating waste intended for recycling, we help protect the natural environment. It is the user's
responsibility to transfer waste electrical and electronic equipment to the selected collection
point for recycling of waste generated from electronic and electrical equipment.

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II. DESCRIPTION OF THE DEVICE
The EU-M-12 control panel is designed to operate with the EU-L-12 controller and it is adapted to control the operation of
subordinate room controllers, sensors and thermostatic actuators. It has wired RS 485 and wireless communication.
The panel allows management of the system by controlling and editing the settings of specific devices of the heating system
in individual zones: pre-set temperature, floor heating, schedules, etc.
CAUTION
Only one panel can be installed in the system. This can provide support up to 40 different heating zones.
Functions and equipment of the controller:
•It provides the ability to control the operation of the EU-L-12 and EU-ML-12 controllers and the
thermostatic actuators, room controllers, wired and wireless temperature sensors (dedicated series 12 or
universal, e.g. EU-R-8b Plus, EU-C-8r) and displays all information in full colour via a large, glass screen.
The control panel does not measure temperature! Controllers and sensors registered in the EU-L-12 and ML-12
controller are used for this purpose.
III. INSTALLING THE CONTROLLER
The EU-M-12 panel is intended to be mounted in an electrical box and should only be installed by a suitably qualified person.
WARNING
Danger of injury or death due to electric shock on live connections. Before working on the device, disconnect
its power supply and secure it against accidental switching on.
CAUTION
Incorrect wiring may damage the controller.
The panel should be connected to the first or last controller due to the fact that the panel itself cannot be equipped with a
terminating resistor. For details on the termination connection, refer to the EU-L-12 manual.

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EU-M-12
EU-L-12

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IV. FIRST STARTUP
REGISTRATION THE PANEL IN THE CONTROLLER
In order for the panel to operate correctly, it must be connected to the EU-L-12 controller according to the diagrams in the
manual and registered in the controller.
1. Connect the panel to the controller and connect both devices to the power supply.
2. In the EU-L-12 controller, select Menu → Fitter’s menu → Control Panel → Device Type
The panel can be registered as a wired or wireless device, depending on the type of assembly.
3. Click the Register option on the M-12 panel screen.
After successful registration, the data is synchronized and the panel is ready to operate.
CAUTION
Registration will only be successful if the system versions* of the registered devices are compatible with each other.
* system version –version of the device (EU-L-12, EU-ML-12, EU-M-12) communication protocol.
CAUTION
Once the factory settings have been restored or the panel has been unregistered from the EU-L-12, the registration
process must be repeated.

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V. MAIN SCREEN DESCRIPTION
1. MAIN SCREEN
1. Enter the Controller Menu
2. Panel information, e.g. connected modules, operation modes, external sensor, etc. (viewable after clicking this
area)
3. OpenTherm enabled (information viewable after clicking this area)
4. Function enabled: Heating stopping from date
5. Outdoor temperature or current date and time (after clicking this area)
6. Zone name
7. Current temperature in the zone
8. Pre-set temperature
9. Additional information tile
2. ZONE SCREEN
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1. Exiting the Zone screen to the main screen
2. Name of the zone
3. Zone status (table below)
4. Current time
5. Active operation mode (can be changed from the screen by clicking this area)
6. Current zone temperature, after clicking the floor temperature (if a floor sensor is registered),
7. Entering the parameters menu of the displayed zone (possible change from the screen after clicking this area),
detailed description below
8. Zone pre-set temperature (possible change from the screen after clicking on this mode)
9. Information about the registered humidity sensor
10. Information about the registered floor sensor
11. Information about the registered room sensor
12. Information about the registered window sensors
13. Information on registered actuators
ZONE STATUS ICON TABLE
Zone alarm
No cooling due to humidity
Zone currently heated
Floor overheated
Zone currently cooled
Floor underheated
Open windows in the zone (no
heating/cooling)
Floor sensor active
Heating disabled in options
No heating due to weather control
Cooling off in options
Optimum Start Enabled
Pump is switched off
Voltage-free contact off
PARAMETER MENU
➢Activity –the function is used to enable/disable the zone. When the zone is disabled, it will not be displayed on the
main screen of the controller.
➢Pre-set temperature –enables the editing of the pre-set temperature in a given zone
•Timer-controlled –the user sets the duration of the pre-set temperature, after this time, the temperature
resulting from the set operation mode will apply
•Constant –the user sets the pre-set temperature. This will apply permanently until it is switched off.
➢Operation mode –The user has the option to select the operation mode.
•Local schedule –Schedule settings that only apply to this zone
•Global Schedule 1-5 –These schedule settings apply to all zones
•Constant temperature - this function allows setting a separate pre-set temperature value that will be valid
in a given zone permanently
•Time limit –the function allows setting a separate temperature that will be valid only for a specific period
of time. After this time, the temperature will result from the previously applicable mode (schedule or
constant without time limit).

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➢Schedule settings –the option to edit the schedule settings.
•Local schedule –Schedule settings that only apply to this zone
•Global Schedule 1-5 –These schedule settings apply to all zones.
The user can assign days of the week to 2 groups (marked in blue and gray). In each group, it is possible to edit separate pre-
set temperatures for 3 time intervals. In addition to the designated time intervals, the general pre-set temperature will apply,
the value of which can also be edited.
1. The overall pre-set temperature in the first group of days (days highlighted in blue, in the example above these are
working days: Monday - Friday). This temperature will apply in the zone outside the designated time periods.
2. Time intervals for the first group of days - pre-set temperature and time frame. Clicking in the area of the selected
time period will take you to the editing screen of its settings.
3. The general pre-set temperature in the second group of days (days highlighted in gray, in the example above it is
Saturday and Sunday).
4. Time intervals for the second group of days - pre-set temperature and time frame. Clicking in the area of the selected
time period will take you to the editing screen of its settings.
5. Groups of days: the first - Mon-Fri and the second –Sat-Sun
•To assign a given day to a specific group, just click in the area of the selected day
•To add time intervals, click in the area of the "+" sign.
CAUTION
The pre-set temperature can be set to within 15 minutes. In the event that the time intervals set by us overlap,
they will be highlighted in red. Such settings cannot be approved.
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VI. CONTROLLER FUNCTIONS
3. OPERATION MODE
The function allows you to activate the selected operation mode in all controllers for all zones. The user has a choice of
normal, holiday, economy and comfort modes. The user can edit the factory mode values using the EU-M-12 panel or the
EU-L-12 and EU-ML-12 controllers.
3.1. NORMAL MODE
The pre-set temperature depends on the set schedule.
Menu → Zones → Master Module → Zone 1-8 → Operation Mode → Schedule… → Edit
3.2. HOLIDAY MODE
The pre-set temperature will depend on the settings of this mode.
Menu →Fitter’s menu →Master Module →Zones > Zone 1-8 →Settings →Temperature Settings > Holiday Mode
3.3. ECONOMY MODE
The pre-set temperature will depend on the settings of this mode.
Menu →Fitter’s menu →Master Module →Zones > Zone 1-8 →Settings →Temperature Settings > Economy Mode
3.4. COMFORT MODE
The pre-set temperature will depend on the settings of this mode.
Menu →Fitter’s menu →Master Module →Zones > Zone 1-8 →Settings →Temperature Settings > Comfort Mode
CAUTION
•Changing the mode to holiday, economy and comfort will apply to all zones. It is only possible to edit the setpoint
temperature of the selected mode for a particular zone.
•In operation mode other than normal, it is not possible to change the pre-set temperature from the room controller
level.
Menu Operation mode
Zones
Controller settings
Software update
Fitter's menu
Service menu
Factory settings

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4. ZONES
The function is used to enable/disable individual zones in the controllers. If a zone is blank and cannot be marked, it means
that no sensor or room controller has been registered in it.
Zones 1-8 are assigned to the main controller (EU-L-12), while zones 9-40 are assigned to EU-ML-12 in the order in which they
were registered.
5. CONTROLLER SETTINGS
5.1. TIME SETTINGS
The function is used to set the current date and time, which will be displayed on the main screen.
5.2. SCREEN SETTINGS
•Screen Saver - By pressing the Screen Saver Selection icon, we go to the panel that allows you to disable the screen
saver option (No screen saver) or set the screen saver in the form of:
Clock –a clock visible on the blank screen
Screen fading –after the idle time has elapsed, the screen will be faded completely
The user can also set the Idle Time, after which the screen saver will start.
•Screen brightness - the function allows you to set the screen brightness while the controller is working
•Brightness blanking - the function allows you to set the brightness of the screen at the time of fading.
•Screen dimming time - The function allows you to set the time that must elapse for the screen to fade completely
after the work is completed.
5.3. PROTECTIONS
•Autoblock off –the function allows you to turn on/off the parental lock.
•Autoblock PIN –if autoblock is enabled, it is possible to set a pin code to secure the controller settings.
5.4. SOUND THE BUTTONS
The function is used to enable/disable the key tones.
5.5. ALARM SOUND
The function is used to enable/disable the alarm sound. When the alarm sound is off, the alarm message will appear on the
display screen. When the alarm sound is on, in addition to the message on the display screen, the user will also hear an
audible signal informing about the alarm.
6. SOFTWARE VERSION
When this option is activated, the manufacturer's logo will appear on the display, along with the controller software
version.

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7. FITTER’S MENU
7.1. MASTER MODULE
7.1.1. REGISTER
The function is used to register the panel in the main EU-L-12 controller. The registration process is described in chapter IV.
First startup.
7.1.2. INFO
The function allows you to preview in which module the panel is registered and what devices and functions are enabled.
7.1.3. NAME
The option is used to change the name of the module in which the panel is registered.
7.1.4. ZONES
Fitter's
menu
Master module
Additional modules
Zones
External sensor
Heating stopping
Anti-stop settings
Max. humidity
DHW settings
OpenTherm
Language
Repeater Function
Factory settings
Zones Room Sensor
Outputs configuration
Settings
Actuators
Window sensors
Floor heating
Zone name
Zone Icon

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ROOM SENSOR
•Sensor selection –this function is used to register a sensor or room controller in a given zone. It has the option of
choosing an NTC wired sensor, an RS wired sensor or a wireless one. The registered sensor can also be deleted.
•Calibration –this is carried out during installation or after prolonged use, when the temperature displayed by the
sensor deviates from the actual one.
•Hysteresis - adds a tolerance for the room temperature in the range of 0.1 ÷ 5°C, at which there is additional
heating/cooling enabled.
OUTPUTS CONFIGURATION
This option controls the outputs: floor pump, no-voltage contact and outputs of sensors 1-8 (NTC to control the temperature
in the zone or floor sensor to control the temperature of the floor). Sensor outputs 1-8 are assigned to zones 1-8, respectively.
The function also allows switching off the pump and the contact in a given zone. Such a zone, despite the need for heating,
will not participate in the control.
SETTINGS
•Weather control - user-available option to switch on/off the weather control.
CAUTION
Weather control only works in heating mode.
•Heating –this function enables/disables the heating function. There is also a selection of a schedule that will be valid
for the zone during heating and for the editing of a separate constant temperature.
•Cooling - this function enables/disables the cooling function. There is also a selection of a schedule that will be valid
in the zone during cooling and for the editing of a separate constant temperature.
•Temperature settings –the function is used to set the temperature for the three operation modes (Holiday mode,
Economy mode, Comfort mode).
•Optimum start - an intelligent heating control system. It consists of continuous monitoring of the heating system
and the use of this information to automatically activate the heating in advance of the time required to reach the
pre-set temperatures. A detailed description of this function is provided in the L-12 manual.
ACTUATORS
•Information –the screen displays the valve head data: battery level, range.
•Settings
SIGMA - the function enables seamless control of the electric actuator. The user can set the minimum and maximum
openings of the valve –this means that the degree of opening and closing of the valve will never exceed these values.
In addition, the user adjusts the Range parameter, which determines at which room temperature the valve will start
to close and open. For detailed description, please refer to the L-12 manual.
CAUTION
The Sigma function is only available for radiator valve actuator heads.

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•Minimum and maximum opening
The function allows you to set the minimum and maximum opening of the actuator in order to obtain the pre-set
temperature.
Protection - When this function is selected, the controller checks the temperature. If the pre-set temperature is
exceeded by the number of degrees in the Range parameter, then all actuators in a given zone will be closed (0%
opening).
Failsafe Mode –The function allows you to set the opening of the actuator heads, which will occur when an alarm
occurs in a given zone (sensor failure, communication error). The emergency mode of the thermostatic actuators is
activated in the absence of power supply to the controller.
The registered actuator can be deleted by selecting a specific one or by deleting all actuators at the same time.
WINDOW SENSORS
•Settings
Enabled - the function enables the activation of window sensors in a given zone (window sensor registration
required).
Delay Time - This function allows you to set the delay time. After the preset delay time, the main controller responds
to the opening of the window and blocks heating or cooling in the respective zone.
CAUTION
If the delay time is set to 0, then the signal to the actuator heads to close will be transmitted immediately.
•Wireless
Information –the screen displays the sensor data: battery level, range
The registered sensor can be deleted by selecting a specific sensor or all can be deleted at the same time.
FLOOR HEATING
In order to control the floor heating, you need to register and switch on the floor sensor: wired or wireless.
•Floor sensor –the user has the option to register a wired or wireless sensor.
Hysteresis - Floor temperature hysteresis introduces a tolerance for floor temperature in the range of 0.1 ÷ 5°C, i.e.
the difference between the pre-set temperature and the actual temperature at which heating or cooling will start.
Calibration - Floor sensor calibration is carried out during assembly or after a longer period of use of the room
controller, if the displayed floor temperature deviates from the actual one.
•Operation modes:
Floor Protection –This function is used to keep the floor temperature below the set maximum temperature to
protect the system from overheating. When the temperature rises to the set maximum temperature, the reheating
of the zone will be switched off.
Comfort profile –This function is used to maintain a comfortable floor temperature, i.e. the controller will monitor
the current temperature. When the temperature rises to the set maximum temperature, the zone heating will be

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switched off to protect the system from overheating. When the floor temperature drops below the set minimum
temperature, the zone reheat will be switched back on.
•Maximum temperature - The maximum floor temperature is the floor temperature threshold above which the
contact will be opened (switching off the device) regardless of the current room temperature.
•Minimum temperature - The minimum floor temperature is the floor temperature threshold above which the
contact will be shorted (switching on the device) regardless of the current room temperature.
ZONE NAME
Each of the zones can be assigned an individual name, e.g. ‘kitchen’. This name will be displayed on the main screen.
ZONE ICON
Each zone can be assigned a separate icon symbolizing how the zone is used. This icon will be displayed on the main screen.
7.1.5. ADDITIONAL CONTACTS
The parameter allows to register additional contacts (max. 6 pcs.) and preview information about these contacts, e.g.
operation mode and range.
7.1.6. VOLTAGE-FREE CONTACT
The option allows you to switch on the remote operation of the voltage-free contact, i.e. start this contact from the EU-ML-
12 slave controller and set the delay time of the contact.
CAUTION
The operation function of the voltage-free contact in a given zone must be enabled.
7.1.7. PUMP
The function is used to switch on the remote pump operation (starting the pump from a slave controller) and to set the delay
time for switching on the pump operation.
CAUTION
The pump operation function in the zone must be enabled.
7.1.8. HEATING-COOLING
The function is used to enable remote operation of the heating/cooling mode (starting this mode from the slave bar) and to
enable a given mode: heating, cooling or automatic mode. In automatic mode, it is possible to switch between heating and
cooling modes based on a binary input.
7.1.9. HEAT PUMP
Dedicated mode for the installation operating with a heat pump, allowing for optimal use of its capabilities.
➢Energy saving mode –ticking this option will start the mode and more options will appear.
➢Minimum break time –a parameter limiting the number of compressor starts, which allows to extend its service life.
Regardless of the need to reheat a given zone, the compressor will turn on only after the time counted from the end
of the previous operating cycle.

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➢Bypass –an option needed in the absence of a buffer, providing the heat pump with an appropriate heat capacity.
It relies on sequential opening of subsequent zones every specified time.
•Floor pump –activate/deactivate floor pump
•Cycle time –the time for which the selected zone will be opened.
7.1.10. MIXING VALVE
The function allows you to view the values and status of individual parameters of the mixing valve. For a detailed description
of the function and operation of the valve, please refer to the L-12 controller manual.
7.1.11. VERSION
The function displays the software version number of the module. This information is necessary when contacting the service.
7.2. ADDITIONAL MODULES
It is possible to expand the number of supported zones by using additional ML-12 controllers (modules) (max. 4 in the system).
7.2.1. MODULE SELECTION
Each controller must be registered separately in the L-12 controller:
•In the L-12 controller, select:
Menu → Fitter’s menu → Additional Modules → Module 1..4 → Module Type → Wired/Wireless → Register
•In the ML-12 controller, select:
Menu → Fitter’s menu → Master Module → Module Type → Wired/Wireless → Register
The ML-12 add-on module can also be registered via the M-12 panel:
•In the panel, select:
Menu → Fitter’s menu → Additional Modules → Module 1…4 → Module Selection → Wired/Wireless → Register
•In the ML-12 controller, select:
Menu → Fitter’s menu → Master Module → Module Type → Wired/Wireless → Register
7.2.2. INFO
The parameter allows you to preview which module is registered in the L-12 controller and which functions are enabled.
7.2.3. NAME
The option is used to name the registered module.
7.2.4. ZONES
The function is described in chapter 7.1.4. Zones.
7.2.5. ADDITIONAL CONTACTS
The parameter allows you to register additional contacts (max. 6 pcs.) and preview information about these contacts, e.g.
operation mode and range.

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7.2.6. VOLTAGE-FREE CONTACT
The option allows you to switch on the remote operation of the voltage-free contact, i.e. start this contact from the EU-ML-
12 slave controller and set the delay time of the contact.
CAUTION
The operation function of the voltage-free contact in a given zone must be enabled.
7.2.7. PUMP
The function is used to switch on the remote pump operation (starting the pump from a slave controller) and to set the delay
time for switching on the pump operation.
CAUTION
The pump operation function in the zone must be enabled.
7.2.8. HEATING-COOLING
The function is used to enable remote operation of the heating/cooling mode (starting this mode from the slave bar) and to
enable a given mode: heating, cooling or automatic mode. In automatic mode, it is possible to switch between heating and
cooling modes based on a binary input.
7.2.9. HEAT PUMP
The parameter functions in the same way as in the master module.
7.2.10. MIXING VALVE
The function allows you to view the values and status of individual parameters of the mixing valve. For a detailed description
of the function and operation of the valve, please refer to the L-12 controller manual.
7.2.11.VERSION
The function displays the software version number of the module. This information is necessary when contacting the service.
7.3. ZONES
The function is described in chapter 7.1.4. Zones.
7.4. EXTERNAL SENSOR
The option allows you to register the selected external sensor: wired or wireless, and enable it, which gives the possibility of
weather control.
The sensor must be calibrated if the temperature measured by the sensor deviates from the actual temperature. The
Calibration parameter is used for this purpose.

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7.5. HEATING STOPPING
Function to prevent actuators from switching on at specified time intervals.
➢Date settings
•Heating Off –sets the date from which the heating will be switched off
•Heating on - sets the date from which the heating will be switched on
➢Weather control - When the external sensor is connected, the main screen will display the external temperature,
while the controller menu will display the mean external temperature.
The function based on the outside temperature allows to determine the mean temperature, which will work on the basis of
the temperature threshold. If the mean temperature exceeds the specified temperature threshold, the controller will switch
off the heating of the zone in which the weather control function is active.
•Enabled –to use the weather control, the selected sensor must be enabled
•Averaging time –the user sets the time on the basis of which the mean outside temperature will be calculated.
Setting range is from 6 to 24 hours.
•Temperature threshold –a function protecting against excessive heating of the respective zone. The zone in which
the weather control is switched on will be blocked from overheating if the mean daily outdoor temperature exceeds
the set threshold temperature. For example, when temperatures rise in the Spring, the controller will block
unnecessary room heating.
7.6. ANTI-STOP SETTINGS
If the anti-stop function is activated, the pump starts, preventing scale from building up in the event of prolonged inactivity
of the pump. Activation of this function allows you to set the operating time of the pump and the operating intervals of this
pump.
7.7. MAXIMUM HUMIDITY
If the current humidity level is higher than the set maximum humidity, the cooling of the zone will be disconnected.
The function is only active in Cooling mode, provided that a sensor with humidity measurement is registered in the zone.
7.8. DHW SETTINGS
By enabling the DHW function, the user has the option to set the mode of operation: time, constant or schedule.
•Time mode - the DHW pre-set temperature will only be valid for the set time. The user can change the contact status
by clicking Active or Inactive. After clicking on the option, the screen for editing the duration of the pre-set
temperature is displayed.
•Constant mode - the DHW setpoint temperature will apply constantly. It is possible to change the contact status by
clicking Active or Inactive.
•Schedule –by enabling this option, we additionally select Settings, where we have the option to set specific days
and times of the DHW pre-set temperature.
•DHW hysteresis - is the difference between the pre-set temperature on the boiler (when the DHW pump is switched
on) and the temperature of its return to operation (switching on). In the case of the pre-set temperature of 55oC
and hysteresis of 5oC, the DHW pump is switched on again after the temperature has dropped to 50oC.