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Two circles secondary thermostatic heating system

Two circles secondary thermostatic heating system
1 059

Heating system for radiator and floor heating - Thermostatic

mixing valve
Temperature range 20-45ºC and 45-70ºC

Content of package:

  • Heating pump unit fixed (thermostatic) temperature mixing valve (2 pieces)
  • Euroster UNI2 controller
  • 2-way insulated distributor 3/4"
  • Pump unit with thermostatic mixing valve



    Heating circuit supplier pump unit

    • Space-saving, compact design
    • Insulated, aesthetic
    • Quick and easy assembling
    • Mechanic friend therefore is more economical to build up
    • Plannable mechanic costs
    • Adjustable heating water temperature per heating circuit
    • Reasonable price/value rate
    • Long lifetime for the best quality components


    DN20 pump units can be connected to heating systems with powers up to 22kW, with a very low energy consumption assured by high efficiency synchronous circulating

    Dimensions: 180x302x142mm (EPP insulation box)
    Centre distance: 90mm
    Especially suitable to manage medium-low powers in small rooms, thanks
    to its centre distance of only 90 mm.


    For power up to 22 kW (with Δt 20 K)
    Maximum flow 1000 l/h.
    Kvs value: 2,0
    PN 10, max temperature 110°C (unit without pump).

    • 3/4” Male with swivel tang to the heat source or to the distributor.
    • 3/4” Female to the user.


    The unit for 1/2” (130 mm) circulating pumps consists of:


    • Connection.
    • Thermostatic mixing valve with temperature setting range, models F1 and F2.
    • High efficiency synchronous pre-wired circulating pump (for the models that include it).
    • Flanged ball valve supplied with in-handle thermometer (coded red, range 0°C-120°C).


    • Flanged ball valve with non return valve 20 mbar (which can be excluded by rotating the handle by 45°) supplied with in-handle thermometer (coded blue; 0°C-120°C).
    • “T” Connection for mixing valve.
    • Connection.


    Approximate data for underfloor and radiators heating systems

    Model Field of regulation Δt Kvs Approximate power and flow of the installation Recommended circulating pump Residual lifting power Approximate surface  of the  underfloor heating system
    F1 20-45ºC 8 K 2.0 4,5kW 500l/h Wilo Yonos Para RS 15/6 5mH₂O Up to a 50m²
    F2 45-70ºC 20 K 2.0 11kW 500l/h Wilo Yonos Para RS 15/6 5mH₂O -
    F1 20-45ºC 8 K 2.0 9kW 1000l/h Wilo Yonos Para RS 15/7,5 5mH₂O From 50m² to 100m²
    F2 45-70ºC 20 K 2.0 22kW 1000l/h Wilo Yonos Para RS 15/7,5 5mH₂O -

    Reference temperatures:
    F1 Model: TH: 550C , TV: 240C TMIX: 320C
    F2 Model: TH: 750C , TV: 400C TMIX: 550C








    UNI2 controller

    UNI2 controller

    UNI2 is a universal controller designed for heating systems equipped with:

    • Two central heating circuits with mixing valves (e.g. for heater supply and floor heating)
    • Domestic hot water (DHW) circuit
    • DHW circulation circuit

    Thanks to its grapichal display the Euroster UNI2 cooling-heating controller gives precise and wide ranged information about its continous operation, making it lot easier to set and to check the device. The unit also includes anti-freeze function which prevents malfunctions outcoming of the freezing.
    Furthermore the controller is useable for buffer tank and boilers, since it has an overheating protection. During overheating it overrides the signal from the room thermostatic.


    Euroster UNI2 cooling-heating controller is equipped with: multifunctional double mixing valve controller,
    quick to assemble set, graphical LCD display, advanced microprocessor technology, knowledge of five commander units in one and the thermal sensors.
    Controller functions: mixed circles cooling-heating, two thermostat signal receptions, start two mixing valves, start domestic hot water pump, optional operating modes, start circulating pump, outer-temperature sensor, weekly programming option, launch other boiler based on room thermostat, anti-stop function, freeze prevention, overheating prevention.


    UNI2 controller

    The heating system controller is equipped with two separate mixing valve and pump controllers, which can be launched by room thermostat signal and tuned by outer temperature signal. Able to receive two separate thermostat signals which are voltage free. The mixing valves can be controlled to heat and cool by a weekly program.
    Euroster UNI2 cooling-heating controller provides two other functions: launch domestic hot water pump of which’s operational mode is selectable (primary or secondary) even by weekly programming. Furthermore its able to launch a circulating pump which has great advantages that its launchable in two different operational modes: temperature surveillance or time definition. Both of these even by weekly programming.
    + automatic fail-safe pump control
    + floor temperation
    The heating system controller is able to launch other boilers (ex.: gas boiler).

    Opening dinamics:

    UNI2 open dinamics

    UNI2 example system:

    UNI2 working

    1. External temperature sensor
    2. Room control unit for circuit 1
    3. Temperature sensor for circuit 1
    4. Central heating pump for circuit 1
    5. Mixer for circuit 1
    6. Supply temperature sensor
    7. Room control unit for circuit 2
    8. Temperature sensor for circuit 2
    9. Central heating pump for circuit 2.
    10. Mixer for circuit 2
    11. Feed pump for DHW tank
    12. Temperature sensor for DHW tank
    13. DHW circulation pump
    14. Temperature sensor for DHW
    15. Circulation

    UNI2 controller wiring:

    UNI2 wiring

    Back of the UNI2 controller:

    UNI2 controller back

    UNI2 sizes:

    UNI2 sizes

    Length of sensors included int he set:
    1. Outdoor temperature sensor (5m)
    2. Powertemperature sensor (1,5m)
    3. CH1 circuit temperature sensor (1,5m)
    4. CH2 circuit temperature sensor (1,5m)
    5. CH3 circuit temperature sensor (1,5m)
    6. Additional heat source temperature sensor (1,5m)

    UNI2 technical data






    2-way insulated distributor 3/4"


    Maximum flow rate up to 2m3/h, 50kW (Δt20K)
    max. 6bar.
    Connection for pump units: ¾”
    Connection for buffer tank: 1”
    Insulation box section size: 100x100x360mm



  • Weight
    14.8 kg/db
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