AURATON Ursa User Manual
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AURATON Ursa User Manual

Advanced cpu-based controller
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AURATON Ursa
User manual ver. 20211204
The document presents collected information on safety, assembly and use of AURATON Ursa.
Description of the device
AURATON Ursa is an advanced CPU-based controller designed to operate with circulating pumps of
district heating ("DH") and domestic hot water ("DHW") systems. The device may be used in thermo
fireplaces with water jacket in DH system and in blowing DH furnace fuelled with coal and coal dust.
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  • Page 1 The document presents collected information on safety, assembly and use of AURATON Ursa. Description of the device AURATON Ursa is an advanced CPU-based controller designed to operate with circulating pumps of district heating (“DH”) and domestic hot water (“DHW”) systems. The device may be used in thermo fireplaces with water jacket in DH system and in blowing DH furnace fuelled with coal and coal dust.
  • Page 2 Display of the AURATON Ursa controller is divided into four control sections. Each section is responsible for controlling a separate device: Section A Control of DH pump. Control of DH pump with a self-reversing actuator or second DH pump (for thermo Section B fireplace system).
  • Page 3 Only one temperature sensor is included in the delivery (with a 2.5 m long cable). For better functionality of AURATON Ursa, purchase additional temperature sensors (option). Upon request, optional sensors may be provided with cables of a length of up-to 15 m.
  • Page 4 Operation in DH system (A-section of the display) Indicator of DH pump operation, Indicator of DH pump sensor, Indicator of active manual mode of operation, Actual temperature of DH sensor SR1,...

  • Page 5: Installation

    DH system. In DH system with a coal boiler, the AURATON Ursa switches off the circulating pump once the boiler has been off. Further water pumping when the boiler is off is not recommended, because air draft to the chimney cools down water in the boiler faster than in the radiators.
  • Page 6 Sensor mounting: Cut off protective caps before wiring. Connect the temperature sensor to SR1 terminals of AURATON Ursa. Next, mount the sensor to the bare outlet pipe of DH boiler (as close as possible to the boiler). temperature sensor cable tie...
  • Page 7 Protect the wires against accidental breakage and connect the power supply cable to a 230 V AC/50 Hz power outlet with a GND pin. NOTE: The ambient temperature in the place of AURATON Ursa operation should not exceed 40 °C.

  • Page 8: First Start-Up

    Use “+” (increase) or “-” (decrease) button to set the desired temperature value. Confirm the set value within 10 s by pressing the „OK” button. Otherwise, new value is not saved and AURATON Ursa returns to the previous setting.
  • Page 9 Otherwise, the change is not saved and AURATON Ursa returns to the previous setting. Automatic mode of operation Upon setting AUTO mode of operation, AURATON Ursa switches the pump on and off depending on the set temperature. In the DH system, the pump turns ON when the temperature in the place where the sensor is located rises above the set value, and turns OFF when the temperature drops below the value set on AURATON Ursa with appropriate application of the set hysteresis.
  • Page 10 „A” button for 3 seconds again. NOTE: f only SR1 sensor is connected, the remaining AURATON Ursa functions are disabled – i.e. indications of DH pump operation in the fireplace system and of pump controller in the DHW system are inactive.
  • Page 11 Power supply 230 V AC Pump Temperature sensor (attached with cable tie) DH boiler. Brown wire...
  • Page 12 Yellow-green wire Blue wire Description of work of the controller with DH pump and self- reversing actuator or second DH pump. – thermo fireplace system (B-section of the display)
  • Page 13 Indication of set DH temperature in the thermo fireplace system. Actual temperature of DH sensor (SR2) Indicator of the set temperature of the self-reversing actuator or the second DH pump. AURATON Ursa uses two control outputs in the thermo fireplace system:...
  • Page 14 Leave the controller ON to make the system operate after the end of heating season. Installation Mounting AURATON Ursa Install the AURATON Ursa on a wall or other support using two screws (expansion dowels are included in the delivery). Fasten wires of AURATON Ursa to wall using holders.
  • Page 15 Cut off protective caps before wiring. Connect the temperature sensor to SR2 terminals of AURATON Ursa. Then install the sensor to outer face of water jacket of the fireplace or to the bare outlet pipe of the DH boiler. (as close as possible to the boiler). Do not immerse the sensor in any liquid and do not install on the flue gas outlet to the chimney.
  • Page 16 , N) terminals, and the other end of the cable to a 230 V AC/50 Hz power outlet with a GND pin. NOTE: The ambient temperature in the place of AURATON Ursa operation should not exceed 40 °C. NOTE: Prior to wiring works disconnect power supply.
  • Page 17 (right) temperature setpoint indicator for the valve or the second DH pump in the fireplace system starts flashing. Use „+” or „–” button to set the desired temperature value. Confirm the set value within 10 s by pressing the „OK” button. Otherwise, new value is not saved and AURATON Ursa returns to the previous setting.
  • Page 18 Automatic mode of operation AURATON Ursa switches on or off the pump and valve depending on the set temperature. In the DH system, the pump and valve turn ON when the temperature in the place where the sensor is located rises above the set value, and turn OFF when the temperature drops below the value set on AURATON Ursa with appropriate application of the set hysteresis.

  • Page 19: Wiring Diagram

    STEP 3 Press and hold down „B” button for 3 s again to disable the manual mode of DH heating pump operation „ ” (left side). STEP 4 Press and hold down „B” button for 3 s again to disable the manual mode „ ”...
  • Page 20 thermo fireplace with water jacket cut-off valve pump heat exchanger self-reversing actuator heat receiver (e.g. radiator) equalizing vessel temperature sensor DH boiler NOTE: If only SR2 sensor is connected, the remaining controller functions are disabled – i.e. indications of pump operation/ control in DH and DHW systems and blower control are inactive.
  • Page 21 Actual temperature of DHW sensor (SR3) Set temperature of DHW sensor AURATON Ursa is also designed to control circulating pump operation (in function of the temperature) in DHW system in AUTO mode. The controller maintains constant water temperature in the tank or in...
  • Page 22 AURATON Ursa returns to the previous setting. nce new value has been saved, AURATON Ursa exits the settings and enters normal operation (the temperature setting stops flashing). AURATON Ursa turns off DHW pump (OUT4) if the temperature on SR3 sensor exceeds the set value by the set hysteresis, and turns it on if the temperature drops by more than the set hysteresis value.
  • Page 23 DHW). In this way cooling down of water in DHW tank is prevented. Installation Mounting AURATON Ursa Install the AURATON Ursa on a wall or other support using two screws (expansion dowels are included in the delivery). Fasten wires of AURATON Ursa to wall using holders.
  • Page 24 Sensor mounting: Connect temperature sensor to SR3 terminals at AURATON Ursa, and fasten it in the DHW tank. Do not immerse the sensor in any liquid and do not install on the flue gas outlet to the chimney. Maximum temperature measurement: 99 °C.
  • Page 25 NOTE: The ambient temperature in the place of AURATON Ursa operation should not exceed 40 °C. NOTE: Prior to wiring works disconnect power supply. First start-up Switching on AURATON Ursa controller À Turn the switch to „I” position. Once the device is ON, all display segments go ON and software º»...
  • Page 26 Press „C” button again to display the set hysteresis (HI). Use „+” or „–” button to set the desired hysteresis value from 2 to 10 °C (with a 2 °C increment). Confirm the set value within 10 s by pressing the „OK” button. Otherwise, the change is not saved and AURATON Ursa returns to the previous setting.
  • Page 27 AURATON Ursa returns to the previous setting. The emergency heat collection function is used when the temperature in the system has grown to a hazardous level above 85 °C and the heat cannot be quickly consumed by the heating system. In this case, DHW tank is used as a heat buffer.
  • Page 28 hot water cold water Temperature sensor (fasten using cable tie) Pump DHW tank Brown wire Yellow-green wire Blue wire With DHW cylinder Temperature sensor DHW tank Pump...

  • Page 29: Fan Control

    Yellow-green wire Blue wire NOTE: If only SR3 sensor is connected, the remaining AURATON Ursa functions are disabled – i.e. indication of DH pump operation (SR1), operation of three-way valve in the thermo fireplace system, and blower control are inactive.
  • Page 30 Firing-up indicator Down-counting fan operation time and time-out between blows (“EE” signalling, setpoints of hysteresis; fan power and start time) Fan operation indicator Indicator of manual fan activation Indicator of forced operation (of DH pump) Indicator of fan power (%) AUTO function indicator Time units (S –...
  • Page 31 DH system with a coal boiler and the blower installed under the furnace. The AURATON Ursa sensor measures the temperature of water in the boiler and controls the pump and the blower based on the actual temperature.
  • Page 32 N) of the controller. Then, connect the other end of the cable to 230 V AC/50 Hz power socket with a grounding pin. NOTE: The ambient temperature in the place of AURATON Ursa operation should not exceed 40 °C. NOTE: Prior to wiring works disconnect power supply.
  • Page 33 Ursa returns to the previous setting. AUTO working mode During normal operation when AURATON Ursa ramps up to reach the desired temperature value in „D” section, AUTO is displayed. The fan works with full power (set in %) until the set temperature has...
  • Page 34 Setting the maximum fan power AURATON Ursa has the function to limit the fan power expressed in %. It can be set within the range from 30 % to 100 % (100 % means full fan power). To change the setting, press „D” button to display the fan temperature.
  • Page 35 Setting the fan soft start time AURATON Ursa enables setting the time of fan ramping-up to the full power set in % (see “Setting the maximum fan power”). Duration of fan soft start may be set from 0 s (start with full power set) to 15 s ramping time (to reach the set full power).
  • Page 36 ” symbol is displayed, and after further 2 s refuelling function is activated. „D” ection of the display shows a 20-minute down counting, upon which the AURATON Ursa returns to normal operation (before fan switch on, sound warning is generated).
  • Page 37 Explanation of display functions § AURATON Ursa displays „LO” if the temperature at SR1, SR2 and SR3 sensors exceeds 0 °C. ¹ ¹ AURATON Ursa displays „ ” if the temperature on SR1, SR2 and SR3 sensors exceeds 99 °C...

  • Page 38: Screen Backlight

    DH boiler Temperature sensor Pump Brown wire Yellow-green wire Blue wire Screen backlight Press any button to switch on display backlight for approx. 1 minute. To switch on display backlight for continuous operation, press and hold down „OK” and „+” button for...
  • Page 39 Any change made using the buttons is confirmed by audible signal. RESET AURATON Ursa In urgent cases (e.g. AURATON Ursa freezing) use „RESET” function. This button is located in the output compartment under the lid.

  • Page 40: Cleaning And Maintenance

    Master RESET AURATON Ursa se this function to restore overall factory settings. To enable this function press and hold down three buttons: „+”, „OK” and „–” at the same time for 5 seconds. Cleaning and maintenance Clean the outside of the device with a dry cloth. Do not use solvents (such as benzene, thinner or alcohol).
  • Page 41 Maximum load for output sum: Working with DH pump and three-way valve “Z” (or second DH pump. – thermo fireplace system) Adjustable temperature range: 10–85 °C Measurement range: 0–99 °C Hysteresis (on/off temperature difference): from 2 to 10 °C Supply voltage: 230 V AC Maximum load for output sum: Working with DHW pump.
  • Page 42 The user shall return it to a collection point for electrical and electronic waste. Contact and address of the manufacturer: LARS, ul. Świerkowa 14 64-320 Niepruszewo www.auraton.pl Download User manual Declaration of conformity...

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