ENGO EWT100 Weather Controller

2 General Information

The Weather controller EWT100 is designed to control the temperature in the heating circuit with a 3 or 4-way valve equipped with a drive-controlled 3-point system, with the possibility of connecting an additional circulation pump and controlling the heat source through a dry contact.

Main functions performed:

• Weather control: The preset temperature for the heating circuit is determined on the basis of the programmed heating curve and the measured outside temperature.
• Automatic detection of heating season.
• Operation with a room thermostat.
• Control of the heat source.
• Implementation of return temperature protection (against low temperature of the return water) and protection from boiling water in the boiler (coal boiler) in case of boiler short-circuit.

The controller is equipped with a timer (clock operation is maintained for 48 hours with the power off the controller). The regulator is easy to operate in an intuitive manner. It may be used in households, other similar premises, and in light industry facilities.

3 Information About Documentation

The regulator manual is divided into two parts: for the user and the fitter. Both parts contain important information significant for safety issues; hence, the user should read both parts of the manual. Engo Controls is not responsible for any damages caused by failure to observe these instructions.

4 Documentation Storage

Please keep this operation and assembly manual and other valid documentation in a safe place for future reference. In case of moving or selling the device, hand this documentation over to a new user or owner.

5 Used Symbols

The following graphical symbols are used in the manual:

• ⚠️ - Useful information and tips.
• ⚠️ - Useful information concerning property damage, health, or life threat for people or pets.

Caution: Important information is labeled with the aforementioned symbols to make the manual easier to understand. However, this does not release the user or installer from the responsibility of complying with requirements not labeled with any symbols.

6 WEEE Directive 2002/96/EC

The act on electricity and electronics:

• ♻️ Utilize used packages and products through an appropriate recycling company.
• Do not discard the product together with household waste.
• Do not burn the product.

7 Regulator Instruction Manual

7.1 Operating the Regulator

The controller has a TOUCH&PLAY system that facilitates its operation. The encoder is operated by rotating and pressing.

To start the controller, keep the encoder knob pressed for 3 seconds. When the message "Active regulator?" appears, set it to YES. The screen will display the main screen. Another press will call the main menu.

Rotating the encoder (TOUCH&PLAY) increases or decreases the value of the parameter being edited. It is the element of quick operation of the regulator.

A short press of the encoder inputs the selected parameter or approves the selected value.

Pressing for 3 seconds exits the selected parameter or rejects the selected value.

All controller settings are made through a rotary system MENU. After calling up the main menu, the screen will display a screen with icons representing the functions of the controller.

7.1 Description of Display Main Window

The main display window shows:

1. Regulator working modes: OFF mode, AUTO mode (work with clock), COMFORT mode, ECONOMY mode, AUTO-ECO mode.
2. Temperature values: preset, current, and external (weather).
3. Pump status: CH pump ON/OFF.
4. Valve mixer actuator position: ON (open), OFF (closed), STOP (off).
5. Heat source status: Working heat source (boiler switched on).
6. Room thermostat information: No icon means the thermostat is off. A symbol indicates heating when room temperature is below the preset, and no heating when room temperature is above the preset.
7. Active SUMMER mode.
8. Active frost protection function.
9. Clock time and weekday.

7.2 Controller Operation

Heat Source:

The controller manages the heat source (e.g., gas, oil, or pellet boiler) by activating or deactivating it based on the central heating system's demand. Switching the heat source on and off can be programmed in intervals via the Schedule menu.

Heating Circuit:

The controller manages one direct heating circuit (radiators or floor heating) with a mixing valve and circulating pump. The control of the heating circuit (including preset temperature adjustments) can be programmed in intervals via the Schedule menu.

Method of Temperature Control:

• Weather Control: The water temperature in the heating circuit is calculated based on the external temperature sensor reading. This maintains room temperature at a preset level despite external temperature changes.
• Continuous Control: The preset water temperature in the heating circuit remains constant, unaffected by external temperature changes.

Preset temperature settings can be adjusted in the Service menu.

8 User's Main Menu

The main menu provides access to various settings:

• Information: View temperature information and enabled devices.
• Work mode: Select from OFF, Auto, Comfort, Economy, Auto-Eco.
• Schedule: Set time intervals for temperature adjustments and heat source operation.
• Circuit: Configure heating circuit settings.
• Heat source: Configure heat source settings.
• Summer/Winter: Manage summer/winter operation modes, including ON/OFF temperatures.
• General settings: Adjust date, time, screen brightness/contrast, sound, and language.
• Service settings: Access advanced configuration options.

8.1 Work Mode

This option allows switching between different operating modes:

• OFF: Turns off the heating circuit. Frost protection remains active if enabled.
• Auto: Room temperature changes according to the time program. "Day" periods use the preset temperature, while "night" periods use a reduced temperature (Preset temperature - Decrease of work mode).
• Comfort: Room temperature is constant and matches the entered Preset temperature.
• Economy: Room temperature is constant and matches the entered temperature (Preset temperature - Decrease of work mode).
• Auto-Eco: Room temperature changes according to the time program. "Day" periods use the preset temperature, while "night" periods completely turn off the heating circuit. Frost protection remains active if enabled.

8.2 Schedule

This feature allows setting time intervals for reducing the heating circuit's preset temperature or controlling the heat source (on/off). This can be done daily (Monday-Sunday).

Time intervals are designated as "day" (corresponds to Preset temperature) and "night" (corresponds to Decrease of work mode). Heat source actions are marked with icons indicating turn on or turn off.

An interval is ignored if the decrease value is set to "0".

8.3 Summer/Winter Function

This function manages automatic or manual heating activation and allows for hot water (HUW) container loading in summer without heating the central heating system. Set "SUMMER mode = ON" via Main menu ➡️ Summer/Winter ➡️ Summer mode.

Note: In SUMMER mode, all heat recipients may be OFF, so ensure the boiler does not overheat.

If an external temperature sensor is connected, the SUMMER function can be activated automatically using the "Auto" parameter, including settings for Summer mode ON/OFF temperatures.

8.4 General Settings

In general settings, users can adjust date, time, screen brightness and contrast, enable/disable sound, and change the controller's language.

8.5 Information

The information menu displays temperatures and the status of enabled devices. The TOUCH&PLAY encoder allows navigation between different information screens.

8.6 Additional Functions

These functions offer enhanced user support. For example, disabling heat source support allows control of the heating circuit only. Conversely, disabling the heating circuit allows control of the heat source via its contact and sensor. The heating circuit can also be controlled with mixing, potentially influenced by an external thermostat.

9 Installation Manual and Service Settings

9.1 Hydraulic Diagrams

The manual includes hydraulic diagrams for different system configurations:

• Diagram 1 (Page 12): Four-way valve controlling central heating or floor circuit. This diagram illustrates a system with a 4-way valve. Components shown and labeled include: EWT100 controller (1), room thermostat (2), external temperature sensor (weather) CT6-P (3), heating circuit temperature sensor CT10 (4), heating circuit pump (5), 4-way valve with actuator (6), return temperature sensor CT10 (7), heat source temperature sensor CT10 (8), heat source with ON-OFF contact (gas and oil boiler) (9), and relief valve (10). Recommended settings for radiator systems and underfloor heating are provided, including max temperature, room thermostat activation, start pump temperature, and return sensor settings. It advises using large pipe cross-sections and avoiding reductions for gravitational circuits and emphasizes proper thermal insulation for sensors.
• Diagram 2 (Page 13): Three-way valve controlling central heating circuit (with hydraulic coupling). This diagram shows a system with a 3-way valve and a hydraulic coupling. Components include: EWT100 controller (1), room thermostat (2), external temperature sensor (weather) CT6-P (3), heating circuit temperature sensor CT10 (4), heating circuit pump (5), 3-way valve with actuator (6), hydraulic coupling temperature sensor CT10 (7), heat source (9), and relief valve (10). Recommended settings for radiator systems are provided.
• Diagram 3 (Page 14): Three-way valve controlling circuit underfloor heating (with hydraulic coupling). Similar to Diagram 2, this illustrates a system for underfloor heating. Components include: EWT100 controller (1), room thermostat (2), external temperature sensor (weather) CT6-P (3), heating circuit temperature sensor CT10 (4), heating circuit pump (5), 3-way valve with actuator (6), hydraulic coupling temperature sensor CT10 (7), heat source (9), relief valve (10), and hydraulic coupling (8). Recommended settings for underfloor heating are provided, including max temperature, room thermostat activation, and start pump temperature.

Note: These hydraulic diagrams are for information purposes only and do not replace professional heating engineering design.

10 Installation of the Controller

10.1 Environmental Conditions

The controller must not be used in explosive gas or dust environments (e.g., coal). It should be installed in an appropriate enclosure. Operation is designed for environments with dry conductive contamination (degree of contamination according to PN-EN 60730-1). It must not be used in conditions with water condensation or be exposed to water.

10.2 Installation Requirements

The controller is designed for vertical wall-mounted installation. External circuit wires should be routed on the surface. Mounting hole locations are shown in the casing diagrams.

⚠️ Before opening the unit casing, disconnect the power supply. The unit installation must be performed with the voltage disconnected.

⚠️ The controller must be installed by a qualified and authorized technician in accordance with the EN 60335-1 standard.

The controller must be installed securely on a flat base, using all mounting points, ensuring adequate degree of protection for environmental conditions, preventing dust and water access, and not exceeding permissible operating temperatures. Adequate air exchange inside the casing is required, and access to dangerous parts must be disabled. The electrical installation must include a device for disconnecting both supply poles.

11 External Circuits Connection

The controller is connected to various external components:

• Room thermostat (TP): Connected via No-Nc terminals.
• Temperature sensors: T1 (heating circuit), T2 (external weather), T3 (return), T4 (heat source).
• Power supply: L, N, PE terminals for 230V~, 50Hz.
• Circulation pump (P).
• Mixer actuator (SM).
• Heat source contact (S): For ON-OFF operation.
• Fuse (FU): Time-delay subminiature fuse.

Terminals for hazardous voltage include COM, NO, ZLo, ZN, ZLc, PN, PL, L, N. Safe voltage terminals are TP, T1, T2, T3, T4.

Outputs SM_OFF, SM_ON, P provide 230V~ voltage on terminals ZLo-ZN, ZLc-ZN, PL-PN respectively. Output S connects COM to NO when activated (no voltage provided).

12 Connecting Electrical System

The regulator requires a 230V~, 50Hz power supply connected to terminals L, N, PE. The electrical system should be three-core (with protective wire) and comply with applicable regulations.

Supply wires must be routed to prevent contact with sensor and low-voltage cabling. Cables must not contact surfaces exceeding their operating temperature limits.

The controller does not have a PE protective connector as it does not require grounding itself. PE terminals for the pump and mixer actuator must be connected to the supply network's PE according to relevant regulations.

⚠️ Connecting the 230V~ mains supply to sensor terminals will damage the regulator and create a risk of electric shock.

Tips of connected wires, especially power leads, must be secured against splitting using insulated clamps, as shown in the diagram (wire tip length of 6 mm).

12.1 Fixing the External Wires

External circuit cables are intended for surface-mounted installation. A concealed external cable outlet with wire strain relief using an electric cable tray is recommended. Loose cable leads, excessive wire rolling, or bending wires into acute angles are not allowed. Rolling excess wire or leaving disconnected cables inside the regulator housing can damage the controller.

Diagram shows example of cable tray installation.

12.2 Connection of Temperature Sensors

Only sensor types CT10 and CT6-P are supported. Sensor cables can be extended up to 15 meters using a cable with a cross-sectional area of at least 0.5 mm².

The boiler temperature sensor should be installed in a thermostatic pipe within the boiler. The mixer temperature sensor should be installed in a sleeve in the water stream of a pipe, or on the pipe itself if properly thermo-isolated from the environment.

Diagram shows sensor mounting on a pipe: 1 - pipe, 2 - clamps, 3 - thermal insulation, 4 - temperature sensor.

⚠️ Sensors must be protected from becoming loose from their mounting surfaces.

Good thermal contact is essential. Use thermal paste. Do not lubricate sensors with water or oil. Sensor wires should be separated from network electrical wires by at least 10 cm to prevent incorrect readings. Avoid contact between sensor wires and hot parts of the boiler or heating installation. Sensor wires are resistant to temperatures up to 100°C.

The regulator allows for temperature error correction (heating, external, return, boiler sensors) up to 0.1°C via Service settings ➡️ Temperature correction.

12.3 Connecting Weather Sensor (External)

The regulator works exclusively with the CT6-P weather sensor. It should be installed on the coldest wall of the building (typically the north wall) under a roof, protected from direct sunlight and rain. The sensor should be at least 2 meters above ground and at least 1.5 meters away from windows, chimneys, or other heat sources that could affect temperature measurement.

Connect the sensor using a 0.5 mm² cross-section cable, up to 25 meters long. Polarity is insignificant. Attach the sensor to the wall using tackbolts, accessed by unscrewing the sensor lid.

Diagram shows sensor attachment with tackbolts and cable.

12.4 Temperature Sensor Checking

Temperature sensors CT10 and CT6-P can be checked by measuring their resistance at different temperatures. If measured resistance differs significantly from the table values, the sensor should be replaced.

12.5 Connecting a Room Thermostat

A room thermostat (No-Nc) connected to the control affects the heating circuit. When the thermostat contact opens, it reduces the heating circuit's preset temperature by the "Decrease of thermostat" value or can turn off the pump via the "Off by thermostat" parameter. Parameter values should be chosen so that when the thermostat contact opens, the room temperature drops.

12.6 Connecting a Heat Source

COM-NO terminals are used to connect the heat source's contact (no voltage) for turning it on and off. This applies to automatic gas or oil boilers with an ON-OFF contact. Terminals COM-NO do not have galvanic isolation from 230V~.

⚠️ Risk of electric shock from a heat source. Disconnect the controller and heat source electrical supply and ensure no dangerous voltage is present on terminals.

Connection to the heat source should be done by a qualified installer according to the boiler's technical data.

13 Service Menu

Access the service menu by entering the password [0000] and pressing OK.

The service menu includes settings for:

• Services settings:
  • Heating circuit (Support, Kind of system, Control method, Weather control, Preset temperature, Decrease of work mode, Decrease of thermostat, OFF by thermostat, Start pump temp., Min. temperature, Max. temperature, Valve full opening time, Valve input dead zone, Valve dynamic, Valve delay)
  • Heat source (Support, Hysteresis, Min. temperature, Max. temperature, Buffer, Buffer preset temp., Cooling temp., HW priority, Increase temp.)
  • Protection (Return sensor, Min. temperature, Hysteresis, Closing the valve, Frost protection, Frost protection delay, Frost protection temp.)
  • Room thermostat (Support)
  • Temperature correction (T1 Circuit sensor, T2 External sensor, T3 Return sensor, T4 Boiler sensor)
  • External sensor (Enable/disable support)
  • Manual control (Pump, mixer actuator, heat source)
  • Screed drying (Active, Program selection P1-P7)
  • Restore defaults settings

Note: Parameters marked with '*' may be hidden or inappropriate if the corresponding sensor is not connected or its support is disabled.

14 Services Settings

14.1 Heating Circuit

• Support: Enable/disable heating circuit support.
• Kind of the system: Select Radiators system or Underfloor heating.
• Control method:
  • Weather control: Uses external temperature sensor. If the sensor is defective or not connected, it defaults to Continuous control.
  • Continuous control: Maintains a constant preset water temperature.
• Weather control specific settings:
  • Heating curve: Select a graph (10-42°C) based on building insulation. Higher curves mean higher water temperature.
  • Curve parallel move: Readjusts the heating curve.
• Preset temperature: For Continuous control, the heat source turns off when the preset temperature is reached and turns on again when it drops. This setting is not available for Weather control.
• Decrease of work mode: Reduces preset temperature in Economic and Auto modes, and during scheduled operation.
• Decrease of thermostat: Used when Room thermostat is ON. Exceeding the preset room temperature decreases the heating circuit's preset water temperature.
• OFF by thermostat: Stops the heating circuit flow by turning off the CH pump when the thermostat contact activates.
• Start pump temp.: Controls pump inclusion and valve actuator opening.
• Min. temperature: Minimum preset water temperature for the heating circuit.
• Max. temperature: Maximum preset water temperature for the heating circuit.
• Valve full opening time: Time for the valve actuator to fully open (e.g., 90-180s).
• Valve input dead zone: Defines a temperature dead zone for the heating circuit to avoid frequent servo movements.
• Valve dynamic: Reaction time of the valve actuator to position changes.
• Valve delay: The mixer valve actuator moves only after this time.

14.2 Heat Source

• Support: Turn heat source support ON or OFF.
• Hysteresis: Defines the temperature range for heat source activation/deactivation.
• Min. temperature: Minimum temperature for the heat source and heating circuit.
• Max. temperature: Maximum temperature for the heat source and heating circuit.
• Buffer support:
  • No: Heat source does not heat up despite temperature drop.
  • Yes: Heat source operates independently to reach the Buffer preset temperature.
• Buffer preset temp.: Temperature for the heat source when buffer support is active.
• Cooling temp.: Temperature at which excess heat is discharged to the heating circuit (protection against overheating).
• HW priority: When ON, lowers circuit preset temperature if heat source temperature is below Min. temperature. When OFF, regulator does not reduce circuit preset temperature.
• Increase temp.: Increases heat source preset temperature above the heating circuit preset temperature.

14.3 Protection

• Return sensor: Enable/disable return temperature sensor support for boiler return protection using a mixing valve. Note: Only enable if an electric actuator is mounted on the valve.
• Min. temperature: Temperature below which the electric actuator turns the mixing valve.
• Hysteresis: Electric actuator returns to normal operation when return temperature reaches Min. temperature + Hysteresis.
• Closing the valve: Percentage of mixing valve opening during return protection.
• Frost protection: Turn frost protection ON or OFF.
• Frost protection delay: Time delay for enabling frost protection.
• Frost protection temp.: Temperature below which frost protection is activated.

14.4 Other Parameters

• Room thermostat: ON or OFF support for the room thermostat.
• Temperature correction: Additional correction for sensors T1, T2, T3, T4.
• External sensor: Enable support for external temperature sensor for heating circuit control. Displays "Damage sensor external temperature" if the sensor fails.
• Manual control: Manually turn ON or OFF the CH pump, mixer actuator, and heat source for testing. Note: Prolonged activation can damage the pump.
• Screed drying: Activates/deactivates floor heating drying function. Adjusts floor circuit temperature over 30 days according to selected programs (P1-P7).
• Restore defaults settings: Resets all factory settings.

15 Function

15.1 Prompts

The controller displays prompts on the main screen indicating status or sensor damage, allowing users to take corrective action. Prompts include:

1. Damage heating circuit sensor temperature.
2. Damage sensor external temperature.
3. Damage sensor return temperature.
4. Damage sensor heat source temperature.
5. Frost protection active!
6. Cooling boiler!

15.2 Heating Circuit

Settings for heating circuit without weather sensor:

Disable the external temperature sensor in the service menu. Manually set the required water temperature using "Preset mixer temp." (e.g., 50°C) to achieve the desired room temperature. If a room thermostat is connected, set "Decrease of thermostat" (e.g., 5°C) to reduce the preset temperature when the thermostat activates, preventing room temperature overshoot.

Settings for heating circuit with weather sensor:

Do not disable the external temperature sensor. Use "Curve parallel move" to set the preset room temperature using the formula: Preset room temperature = 20°C + Curve parallel move. A room thermostat can be connected to compensate for inaccuracies in heating curve selection. Set "Decrease by thermostat" (e.g., 2°C) for this purpose.

Weather Control:

Enable weather control by setting Service settings ➡️ External sensor = ON. This activates the "Weather control" menu. The heating circuit water preset temperature is calculated based on the outside temperature, following a heating curve. The curve can be adjusted in the system menu based on building insulation. For trial-and-error selection, set Room thermostat to OFF. The regulator can adjust the preset temperature if it exceeds the Min./Max. temperature range for the circuit.

Example heating curves are provided for underfloor heating and radiator systems, showing preset temperatures at different external temperatures.

Guidelines for selecting a proper heating curve: Adjust the curve if room temperature increases or decreases with dropping external temperature. For buildings requiring more heat, use higher curves; for well-heated buildings, use smaller values.

15.3 Frost Protection

This function is active in OFF or AUTO-ECO modes. It activates if the external temperature drops below 3°C and a delay (e.g., 4h) expires. If the temperature remains below 3°C, the heating circuit pump runs for 30 minutes. If the mixer sensor temperature is below 13°C, the heat source is set to "Frost protection temp.". The pump and heat source turn off only when the external temperature rises above 3°C. The pump also activates if there's a risk of freezing.

Adjustable circuit: Similar to the above, but the pump runs for 15 minutes if the temperature stays below 3°C after the delay. If the water temperature is above 13°C, the pump stops; otherwise, it continues to heat up to the "Frost protection temp." value.

⚠️ During a risk of frost, do not connect the controller from the mains supply.

15.4 Power Stoppage

In case of power stoppage, the controller returns to its previous operation mode.

15.5 Prevention Cooling

This function attempts to cool down the heat source before activating the heat source overheat alarm state.

15.6 Pump Anti Standstill Function

This function protects the pump from immobilization due to scaling by periodically switching it on for a few seconds (e.g., every 167 hours). Ensure the controller power supply remains connected during breaks in use.

15.7 Fuse Replacement

⚠️ Cut off power supply before replacing the fuse. Use a 1.25A time-delay subminiature fuse with a minimum interrupting current of 100A (per IEC 60127 standard). Open the controller enclosure to replace the burnt fuse.

16 Storage and Transport Conditions

The controller must not be exposed to rain or sunrays. Storage temperature should be between 0°C and 65°C.

17 Technical Data