TECH CONTROLLERS EU-WiFi 8s User Manual

Brand: TECH CONTROLLERS

I. SAFETY

Before using the device for the first time, read the following regulations carefully. Non-compliance may lead to personal injury or controller damage. Store the user manual in a safe place for future reference. Ensure all users are familiar with the device's operation and security functions to avoid accidents and errors. If the device is moved, the manual must accompany it for access to essential information. The manufacturer is not responsible for injuries or damage resulting from negligence; users must take necessary safety measures.

⚠️ WARNING: A live electrical device! Disconnect from the mains before any power-related activities (plugging cables, installation). The device should be installed by a qualified electrician. It should not be operated by children.

⚠️ WARNING: The device may be damaged by lightning. Disconnect the power supply during storms. Any use other than specified by the manufacturer is forbidden. Check the controller's cables before and during the heating season, and ensure it is properly mounted. Clean it if dusty or dirty.

Changes described in this manual may have been introduced after its completion on 11.08.2022. The manufacturer reserves the right to change the structure or colors. Illustrations may include additional equipment, and print technology may cause color differences.

TECH CONTROLLERS is committed to environmental protection. The disposal of used electronic components must be environmentally safe. The crossed-out bin symbol ?️ indicates that the product must not be disposed of with household waste. Recycling helps protect the environment. Users must transfer used equipment to a collection point for recycling.

II. DEVICE DESCRIPTION

The EU-WiFi 8s controller is an online wireless device for controlling electric actuators STT-868/STT-869 (software version 2.1.8 and later), supporting up to 6 actuators per zone. Its primary function is to maintain constant room temperature across 8 heating zones using actuators. The controller includes an additional contact for switching auxiliary devices, such as a gas boiler.

Controller functions:

Controls up to 8 zones using: built-in temperature sensor, wired sensor, or up to 8 additional wireless sensors (C-8r, C-mini) or room regulators (R-8b, R-8z, R-8bw, software version 2.1.19 and later).
Features a NO/NC relay output for controlling heating devices activated when room temperature is too low.
Supports connection of up to 6 wireless electric actuators (STT-868 or STT-869) per zone (software version 2.1.8 and later).
Allows software updates via USB.
Each zone can be assigned an individual operation mode (constant temperature, time limit, or 6 operation schedules).
Compatible with C-8zr wireless external sensor.
Compatible with wireless window sensors C-2n (up to 6 sensors per zone).

Controller equipment:

Power supply: 5V
Wired sensor: C-7p

The heating system can be managed via the web application at www.emodul.eu. The eModul application is available for download from the Google Play store.

III. PRINCIPLE OF OPERATION

The EU-WiFi 8s controller determines heating needs based on current temperature values from room sensors (C-8r, C-mini, C-7p) or room regulators (R-8b, R-8z, R-8bw, software version 2.1.19 and later), and the zone's operation algorithm. If heating is required, it activates the voltage-free contact (e.g., for the heating device) and opens actuators registered in that zone. Signals from each zone are transmitted to the controller via radio signal from regulators or sensors. Wireless valve actuators (STT-868/STT-869, version 2.1.8 and later) can be assigned to each zone after registration.

IV. HOW TO INSTALL THE CONTROLLER

The controller installation should be performed by a qualified person.

⚠️ WARNING: Risk of fatal electric shock from touching live connections. Switch off the power supply and prevent accidental reactivation before working on the controller.

Remove the controller cover and connect wires according to the diagrams and connector labels, observing the following order: power supply cable to the Micro USB port, and connections for the additional device.

Diagram showing the EU-WiFi 8s controller, its power connection via Micro USB, and terminals for an additional device. Surrounding devices include a wired sensor (C-7p), a wireless window sensor, and a heating device connected to the controller's output terminals.

Schematic Diagram of Wiring-Up and Communication

This schematic illustrates the system architecture. The central EU-WiFi 8s controller is shown connected to multiple zones (S1-S8). Zone S1 uses a built-in temperature sensor. Zone S2 uses a wired temperature sensor. Zones S3-S8 use wireless temperature sensors. Each zone can control up to 6 wireless actuators (STT-868, STT-869). Various sensors and regulators (C-mini, C-8r, R-8b, R-8z, R-8bw) and window sensors (C-2n) are shown communicating wirelessly with the controller. The diagram also indicates the type of sensor used for each zone (built-in, wired, or wireless).

V. FIRST START-UP

Follow these steps for proper initial controller operation:

Configure the Internet connection.
Configure the external sensor (optional).
Configure room sensors and room regulators.
Configure wireless thermostatic actuators STT-868/STT-869 (software version 2.1.8 and later).
Configure window sensors (optional).

1. How to configure internet connection

The EU-WiFi 8s has a built-in Internet module for controlling the heating system online. Connect to your WiFi network via 'Menu > WiFi network selection'. Parameters like IP Address, IP Mask, and Gateway Address can be set manually or via DHCP (default). Visit www.emodul.eu to create an account. In the controller menu, select 'Registration' to generate a code, which must be entered in the 'Settings > Register module' tab on the website.

2. How to configure external sensor

Register the external sensor by selecting 'Registration' (Main menu > External sensor > Registration) and pressing the sensor's communication button briefly. The sensor is enabled automatically upon registration and can be switched off via the menu without disabling it. It remains active until the battery is depleted.

Image shows an external sensor unit with its communication button on the back.

ℹ️ NOTE: The external sensor is not involved in the control process. Switching it off only interrupts its display on the controller screen, not its functionality.

3. How to configure temperature sensors and room regulators

To enable zone control, the EU-WiFi 8s requires current temperature values. Use a C-8r or C-mini temperature sensor for basic readings, or an R-8b, R-8z, or R-8bw room regulator (software version 2.1.19 and later) for direct temperature adjustment from the zone. All sensors/regulators must be registered in the controller menu for the specific zone. Registration involves navigating to the zone's submenu, selecting 'Registration', and pressing the communication button on the device.

Image shows a room temperature sensor (C-8r) with its communication button highlighted.

ℹ️ NOTE: Only one room sensor can be assigned per zone. Zone 1 uses the built-in sensor. Zone 2 uses a wired sensor, but can be set to wireless. Follow these rules: only one temperature sensor per zone, sensors cannot be unregistered but can be switched off. If a new sensor is assigned to a zone with an existing sensor, the old one is replaced. Assigning a sensor already registered in another zone will unregister it from the first zone. Individual pre-set temperatures and weekly schedules can be set per zone or configured via www.emodul.eu.

4. How to configure wireless thermostatic actuators STT-868/STT-869 (Software Version 2.1.8 and Later)

Register actuators by installing them on the radiator, waiting for calibration, then selecting 'Actuators/Registration' in the EU-WiFi 8s menu for the desired zone. Press the actuator's registration button within 120 seconds. A successful registration is confirmed on the display. Errors may occur if more than 6 actuators are registered per zone or if there's no signal from the actuator within 120 seconds.

5. How to configure window sensors

Register window sensors by selecting 'Registration' in the main menu and briefly pressing the sensor's communication button. A double flash of the control light indicates successful communication; a continuous light indicates no communication.

VI. WIRELESS COMMUNICATION

The EU-WiFi 8s controller communicates wirelessly with various devices:

Device	Function	Configuration
C-8r room temperature sensor	Sending current room temperature readings	The sensor should be registered in a given zone.
C-mini room temperature sensor	Sending current room temperature readings	The sensor should be registered in a given zone.
R-8b (2xAAA 1.5V)	Sending current zone temperature readings; adjusting pre-set temperature directly from the zone	Register the room regulator in one of the zones.
R-8bw (2xAAA 1.5V)	Sending current zone temperature data; adjusting pre-set temperature directly from the zone; built-in humidity sensor	The room regulator should be registered in a given zone.
R-8z (230V 50Hz)	Sending current zone temperature data; adjusting pre-set temperature directly from the zone	The room regulator should be registered in a given zone.
C-7p wired room sensor	Sending current room temperature readings
C-8zr external temperature sensor	Sending current external temperature data to EU-WiFi 8s controller	The sensor should be registered in EU-WiFi 8s controller.
STT-868 wireless thermostatic actuator	Opening/closing the valve to maintain desired temperature	The actuator should be registered in a given zone.
STT-869 wireless thermostatic actuator	Opening/closing the valve to maintain desired temperature	The actuator should be registered in a given zone.
C-2n window sensor	Sending a signal about window opening/closing	Install the sensor on a window and register it in the zone.

VII. MAIN SCREEN DESCRIPTION

The controller display shows various information and status indicators. The buttons are labeled EXIT, PLUS, MINUS, and MENU.

Image of the EU-WiFi 8s controller unit with 5 buttons labeled: 1. Display, 2. EXIT, 3. PLUS, 4. MINUS, 5. MENU.

1. Display: Shows system information.
2. EXIT: Used to open screen selection submenu or cancel settings and exit a submenu.
3. PLUS: Used to view the next zone's status or increase values when editing parameters.
4. MINUS: Used to view the previous zone's status or decrease values when editing parameters.
5. MENU: Used to enter the controller menu and confirm settings.

Main Screen Description – Zones

Image of the controller's display showing zone information. Numbered elements point to: 1. WiFi signal strength, 2. Additional device icon, 3. External temperature, 4. Current time, 5. Zone information (current temperature, heating status indicator), 6. Weekly schedule type or time left, 7. Battery level of sensor/regulator, 8. Signal strength of sensor/regulator, 9. Pre-set zone temperature, 10. Current zone temperature, 11. Icon indicating active heating.

Main Screen Description – WiFi

Image of the controller's display showing WiFi network status. Numbered elements point to: 1. Day of the week, 2. Current date, 3. Current time, 4. Signal strength, 5. WiFi network name.

Main Screen Description - Zone 1

Image of the controller's display showing Zone 1 status. Numbered elements point to: 1. WiFi signal strength, 2. Current time, 3. Current date, 4. Pre-set zone temperature, 5. Time left before next pre-set temperature change, 6. Additional device icon, 7. Current room temperature.

VIII. CONTROLLER FUNCTIONS

1. Block Diagram - Controller Menu

A hierarchical menu structure is displayed. The main categories are 'Menu', 'Zones 1-8', 'External sensor', 'Voltage-free contact', 'Fitter's menu', and 'Software version'. Under 'Zones 1-8', options include 'Registration', 'ON', 'Type of sensor', 'Pre-set temperature', 'Hysteresis', 'Calibration', 'Actuators', and 'Window sensors'. Under 'External sensor', options are 'Registration', 'ON', 'Signal', 'Battery', 'Calibration', and 'Zones'. Under 'Voltage-free contact', options are 'Activation delay' and 'Additional contact'. 'Fitter's menu' and 'Software version' are listed as top-level items.

2. Zones

This submenu allows users to configure operation parameters for specific zones.

2.1. Registration

The Registration function is available for zones 3-8 and zones 1-2 if a wireless sensor type is selected. Once a room sensor is switched on and registered in a zone, its readings are used by the EU-WiFi 8s controller. The sensor can be disabled by deselecting 'ON'.

2.2. ON

Enables or disables the room sensor's readings for the EU-WiFi 8s controller.

2.3. Type of Sensor

Available for zones 1 and 2, allowing selection between internal (built-in or wired) and wireless sensors.

2.4. Pre-set Temperature

Allows setting a specific pre-set temperature, overriding the weekly schedule. This can be a constant temperature or for a defined period.

2.5. Hysteresis

Defines the temperature tolerance (0.1°C to 10°C) to prevent frequent on/off cycles. For example, with a 23°C pre-set and 0.5°C hysteresis, heating starts when the temperature drops to 22.5°C.

2.6. Calibration

Room sensor calibration can be performed during mounting or later if displayed temperature differs from actual. Range is -10°C to +10°C with 0.1°C accuracy.

2.7. Actuators

Configures thermostatic actuators (STT-868/STT-869, version 2.1.8+). Up to 6 actuators can be registered per zone. Registration details are in the 'First Start-up' section. Actuators can be identified, monitored, or removed individually. The 'Settings' submenu (from version 2.1.34) allows defining maximum and minimum actuator opening levels. The 'Range' parameter sets the temperature at which the valve starts opening/closing. The 'SIGMA' function provides smooth control and allows setting minimum/maximum valve closing levels.

Graph showing actuator opening percentage versus temperature, illustrating 'RANGE', 'HYSTERESIS', and 'SET' temperature points. It details how the valve closes at 18°C (23°C - 5°C Range) and opens at 21°C (23°C - 2°C Hysteresis).

Protection: If the pre-set temperature is exceeded by the 'range' value, actuators close (0% opening), only when 'SIGMA' is enabled.

Emergency mode: Forces actuator opening during alarms (sensor failure, communication error) or power loss to the controller.

2.8. Window Sensors

Registration: Select 'Registration' and press the sensor's communication button. A double flash indicates success; continuous light indicates failure.

Sensor removal: Removes sensors from a zone.

Information: Displays registered sensor details, range, and battery level.

Settings: Sets a delay time (0-30 minutes) before actuators close when a window is detected open. If the delay is 0, actuators close immediately.

3. External Sensor

An external temperature sensor can be connected to monitor temperature on the main screen and via the emodul.eu application. It is not involved in the control process and must be registered.

4. Voltage-Free Contact

4.1. Zones

Select zones that influence the built-in voltage-free contact. If no zone is selected, the contact is not activated even if the temperature is too low.

4.2. Activation Delay

The controller activates the additional contact after a delay if any zone's temperature is below the pre-set value. The contact is deactivated when the pre-set temperature is reached.

4.3. Additional Contact

Registers MW-1 (voltage-free) or MW-1-230V (voltage contact) modules. Follow steps: press module's registration button, then select 'Registration' in the EU-WiFi 8s controller.

5. Fitter's Menu

A menu tree for the Fitter's menu is shown, including 'Internet module' (WiFi network selection, Network configuration, Registration, Time lock, Blocking time, PIN code), 'Protection', 'Time settings' (Automatic, Time settings, Date settings), 'Screen settings' (Screen view, Display contrast, Screen brightness, Screen blanking, Screen blanking time), 'Language', 'Service menu', and 'Factory settings'.

IX. HOW TO CONTROL THE HEATING SYSTEM ONLINE

The www.emodul.eu website offers tools to control your heating system. Create an account to use these features.

Screenshot of the emodul.eu website showing the account registration form with fields for username, password, email, and a CAPTCHA code.

After logging in, go to the 'Settings' tab and select 'Register module'. Enter the code generated by the controller (via EU-WiFi 8s menu > Registration). You can assign a name to the module in the 'Module description' field.

Screenshot of the emodul.eu website showing the 'New module registration' form, including fields for Module description, Registration code, country, postal code, notification email, additional information, and a CAPTCHA code.

1. Home Tab

The Home tab displays tiles showing the current status of heating system devices. Tapping a tile allows adjustment of operation parameters.

Screenshot of the EU-WiFi 8s controller's 'HOME' tab interface, showing tiles for different zones (e.g., 'Strefa 1') with current temperature, set temperature, and status indicators.

ℹ️ NOTE: A 'No communication' message indicates an interrupted connection with a temperature sensor, often due to a flat battery.

Tap a zone's tile to edit its pre-set temperature.

Screenshot showing how to edit the pre-set temperature for a zone (e.g., 'Living room'), with options for 'Constant temperature' or 'Schedule'.

The upper value on the display is the current zone temperature, and the bottom value is the pre-set temperature. The pre-set temperature defaults to the weekly schedule. 'Constant temperature' mode allows setting a specific pre-set temperature regardless of time. Time limits can be set for this mode, after which the schedule or default constant temperature applies.

Screenshot showing the 'With time limitation' setting for a zone, allowing users to set hours and minutes for a specific temperature.

Tap the 'Schedule' icon to open the schedule selection screen.

Screenshot showing the schedule selection screen, offering 'Local schedule' and 'Global schedule' options (1-5).

Two types of weekly schedules are available: 'Local schedule' (assigned to a specific zone) and 'Global schedule' (assignable to multiple zones). After selecting a schedule, tap 'OK' to edit its settings.

Screenshot illustrating the editing of a weekly schedule, showing settings for 'Setback temperature' and 'Set temperature' for different time periods and days of the week (Monday-Sunday).

2. Zones Tab

The Zones tab allows customization of the home page view by changing zone names and corresponding icons.

Screenshot of the 'Zones tab' interface, showing two zones ('Living room', 'Kitchen') with options to change name, icon, and perform 'Turn off' or 'Reset' actions.

3. Statistics Tab

The Statistics tab displays temperature charts for various periods (24h, week, month) and allows viewing statistics for previous months.

Screenshot of the 'Statistics tab' showing example temperature charts for different zones and time periods, with options to generate charts and view data for 'Last day', 'Last week', 'Month', and specific months/years.

4. Settings Tab

The Settings tab is used to register new modules and change email addresses or passwords.

Screenshot of the 'Settings/Module tab' interface, showing modules associated with the account, options to register a new module, and details like controller type, last update, and time zone.

Screenshot of the 'Settings/Account tab' interface, showing account settings with fields for username, email, current password, new password, and confirm password.

X. SOFTWARE UPDATE

ℹ️ NOTE: Software updates should only be performed by a qualified fitter. Previous settings cannot be restored after an update.

To install new software, unplug the controller, insert the USB flash drive with the software, and switch the controller on. The controller restarts automatically after the update is complete.

ℹ️ NOTE: Do not switch off the controller during the software update process.

XI. TECHNICAL DATA

Specification	Value
Supply voltage	5V DC
Operation temperature	5-50°C
Maximum power consumption	2W
Potential-free cont. nom. out. load	230V AC / 0.5A (AC1) * 24V DC / 0.5A (DC1) **
Frequency	868MHz
Transmission	IEEE 802.11 b/g/n

* AC1 load category: single-phase, resistive or slightly inductive AC load.

** DC1 load category: direct current, resistive or slightly inductive load.

XII. PROTECTIONS AND ALARMS

The device supports the following cases within a zone:

Alarm	Possible Cause	How to fix it
Damaged sensor alarm (internal sensor damage)	Internal sensor in the controller damaged.	Call the service staff. Place the sensor/regulator in a different place. Insert batteries to the sensor/regulator. Alarm deactivates automatically when communication is established.
No communication with the sensor/wireless regulator	No range; No batteries; Batteries are flat.	Place the sensor/regulator in a different place. Insert batteries to the sensor/regulator. Alarm deactivates automatically when communication is established.
STT-868 actuator alarms: ERROR #0 - low battery	The actuator battery is flat.	Replace the batteries.
STT-868 actuator alarms: ERROR #1 - possible damage of mechanical or electronic parts	Some parts have been damaged.	Call the service staff.
STT-868 actuator alarms: ERROR #2 - maximum actuator stroke exceeded	No piston controlling the valve; Too big stroke (movement) of the valve; Actuator incorrectly mounted on radiator; Inappropriate valve on radiator.	Install a piston controlling the actuator. Check the valve stroke. Install the actuator correctly. Replace the valve on the radiator.
STT-868 actuator alarms: ERROR #3 – too little piston movement	Valve got stuck; Inappropriate valve on radiator; Too little stroke (movement) of the valve.	Inspect the valve operation. Replace the valve on the radiator. Check the valve stroke.
STT-868 actuator alarms: ERROR #4 no return communication (to the actuator)	Out of range; No batteries.	The actuator is too far from the controller. Insert batteries into the actuator. After communication is re-established, the alarm is deactivated automatically.
STT-869 actuators alarms: Error #1 - Calibration error 1 (mounting took too much time)	The limit switch sensor is damaged.	Calibrate actuator again by holding the communication button until the third flash of green light. Call the service staff. Check if the controller has been installed properly.
STT-869 actuators alarms: Error #2 - Calibration error 2 (screw maximally pulled out, no resistance)	Actuator not screwed to valve or not completely screwed; Valve stroke too big or dimensions not typical; Actuator current sensor is damaged.	Replace the batteries. Calibrate actuator again by holding the communication button until the third flash of green light. Call the service staff.
STT-869 actuators alarms: Error #3 - Calibration error 3 (screw not pulled out enough, meets resistance early)	Valve stroke too small or dimensions not typical; Actuator current sensor is damaged.	Replace the batteries.
STT-869 actuators alarms: Error #4 - No feedback	Master controller switched off; Poor or no range in master controller; Radio module in actuator damaged.	Call the service staff. Check if the master controller is on. Reduce the distance from the master controller. Call the service staff.
STT-869 actuators alarms: Error #5 - Low battery level	The battery is flat.	Replace the batteries.
STT-869 actuators alarms: Error #6 - Encoder is locked	The encoder is damaged.	Calibrate actuator again by holding the communication button until the third flash of green light. Call the service staff.
STT-869 actuators alarms: Error #7 - To high voltage	Unevenness of screw/thread causing excessive resistance; Too high resistance of gear or motor; Current sensor is damaged.	Call the service staff.
STT-869 actuators alarms: Error #8 - Limit switch sensor error	Limit switch sensor damaged.	Call the service staff.

EU Declaration of Conformity

TECH declares that the EU-WiFi 8s, manufactured at Wieprz Biała Droga 31, 34-122 Wieprz, complies with Directive 2014/53/EU, Directive 2009/125/EC, and Ministry of Entrepreneurship and Technology regulations regarding essential requirements and restriction of hazardous substances in electrical and electronic equipment. Compliance assessment used harmonized standards including PN-EN IEC 60730-2-9, PN-EN IEC 62368-1, PN-EN 62479, ETSI EN 301 489 series, ETSI EN 300 328, ETSI EN 300 220 series, and EN IEC 63000.

Date: Wieprz, 11.08.2022

Signed: Paweł Jura, Prezesi firmy

	TECH CONTROLLERS EU-WiFi 8s User Manual: Smart Heating Control Explore the TECH CONTROLLERS EU-WiFi 8s user manual for detailed instructions on installing, configuring, and operating this wireless heating controller. Learn about zone management, remote access via eModul.eu, and energy-efficient temperature regulation.
	TECH EU-L-4X WiFi User Manual - Smart Heating and Cooling Controller This user manual provides detailed information on the TECH EU-L-4X WiFi controller, covering system description, installation, operation modes, zone management, advanced functions, troubleshooting, and technical specifications for efficient home climate control.
	TECH EU-ML-4X WiFi User Manual & Installation Guide User manual and installation guide for the TECH EU-ML-4X WiFi floor heating extension module. Learn about safety, technical data, device description, and installation procedures for your heating control system.
	TECH EU-C-8f Wireless Floor Temperature Sensor User Manual and Specifications Comprehensive user manual and technical specifications for the TECH EU-C-8f wireless floor temperature sensor. Learn about installation, registration, safety, warranty, and compliance.
	TECH CONTROLLERS EU-WiFi X User Manual: Installation, Setup, and Operation Guide Comprehensive user manual for the TECH CONTROLLERS EU-WiFi X module. Covers installation, internet connection, emodul.eu app control, zone management, software updates, and technical specifications. Learn how to optimize your heating system.
	TECH EU-L-X WiFi User Manual: Smart Heating and Cooling Zone Control Comprehensive user manual for the TECH EU-L-X WiFi controller, detailing installation, operation, features, and troubleshooting for smart heating and cooling zone management. Learn about system setup, controller functions, alarms, and technical specifications.
	TECH CONTROLLERS EU-M-12t User Manual: Installation and Operation Guide Comprehensive user manual for the TECH CONTROLLERS EU-M-12t control panel, detailing installation, system setup, operation modes, zone management, settings, and technical specifications for efficient heating control.
	TECH EU-T-4.1n/EU-T-4.2n Room Regulator User Manual User manual for the TECH EU-T-4.1n and EU-T-4.2n room regulators, detailing installation, operation, functions, and technical specifications for efficient heating and cooling control.