2-Way pump unit with 3-way mixing valve with built-in by-pass

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

SUPPLY:
- Connection.
- 3-way mixing valve with adjustable by-pass. Through the by-pass (adjustable from the front part) it is possible to mix on the supply line a quantity of water coming back from the return line of the system.
- Synchronous pre-wired circulating pump with cable 2 m. long (for the models that include it).
- Flanged ball valve supplied with in-handle thermometer (coded red, range 0°C-120°C).

RETURN:
- 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.

Centre distance 90 mm. EPP insulation box (Measurements: 180x302x142 mm). PN 10, max temperature 110°C (unit without pump).
Connections: 3/4” Male with swivel tang to the heat source or to the distributor. 3/4” Female to the user.

FIELD OF UTILIZATION:
For power up to 33 kW (with Δt 15 K) and maximum flow 1900 l/h.
Kvs Value: 5,5.
For an accurate measuring or for higher flows, please refer to the diagram.

Circulating pump:
Wilo Yonos Para RS 15/6 RKC (C6)


We suggest you to install two isolating valves Art. 552 3/4” (see "Distributor" section) before the pump unit to allow an easy service or replacement of the components of the unit.


The By-pass integrated into the 3-way mixing valve ensures a recyling inside the installation, even when the mixing valve is fully open. Through the by-pass, a fixed percent of the mixing can be set, in the case when the flow through the mixing valve is not sufficient. Therefore, in case of a bad working of the system causing an increase of the temperature of the installation, the recycling through the by-pass allows a decrease in the temperature of the water in the undrefloor installation. This can be done mixing the warm water of the return circuit with the hot water of the supply circuit, reducing possible damages.

M2 MIX33 pump units are supplied with the recycling by-pass fully open.