System to connect multiple ModvFresh DHW modules in cascade for installations requiring high power and flow rates, or with low-medium temperature heat sources (heat pumps).

ModvFresh Kascata is an innovative control logic that allows multiple standard ModvFresh pump units to be connected in cascade for the production of domestic hot water (DHW), enabling a maximum flow rate and thermal power exchange equal to the sum of the individual modules' performance.
The system is suitable for applications with large buffer tanks connected to solar thermal circuits, heat pumps, biomass boilers, etc., ensuring the production of instantaneous domestic hot water while preventing legionella growth due to stagnation of heated water.
The entire system is managed via a bus connection that links the control units of the individual ModvFresh units. By monitoring the flow rate from the hot water system, the control units activate the necessary DHW modules, controlling the respective actuators on the cold water inlets. This Kascata system proves to be highly flexible and can be designed and built with a modular approach to meet the specific needs of the system.
The control logic thus optimizes operation when combined with low-medium temperature heat sources, such as heat pumps.

ModvFresh cascade connections maximize efficiency by fully utilizing the thermal energy available in the buffer tank. The configuration can be adapted to the project requirements, which typically vary between installations in terms of temperature, storage volume, flow rates, and the required temperature for use.

Anti-freeze valve for heating/cooling systems with heat pump.

The anti-freeze valve allows to protect the pipes and the heat pump from failures caused by freezing of the water inside them.
In case of shutdown of the system during the winter season, if the water temperature drops down to +3°C, the valve starts to open allowing a discharge, initially modest: the outflow draws the water from the side of the circuit inside the building, having a higher temperature, thus preventing the formation of ice.

If the discharge continues due to cold temperatures, in the absence of a filling group, the internal pressure of the circuit runs out and tends to reach atmospheric pressure, thus making the outflow impossible: a vacuum breaker valve present in the upper part of the valve body intervenes to allow the intake of air, allowing water drainage to continue.
The presence of an automatic circuit filling unit is recommended it which, by restoring the pressure in the circuit, will bring the anti-freeze valve back to normal working conditions and the system will be able to restart autonomously.

Modular Multi-Zone Distribution Box for Heat Pumps and Conventional Heat Generators

The extremely compact design allows up to three circuits to be hydraulically connected within a total width of just 450 mm.

The primary circuit includes two 1” male shut-off valves, a distribution manifold with an integrated hydraulic separator, or a simple manifold for systems up to 50 kW.

The hydraulic separator disconnects the primary circuit from the secondary circuit, enabling greater volumetric circulation of the heat transfer fluid compared to the fluid circulating in the generator.

Special insulation ensures suitability for cooling applications, preventing condensation.

It also includes an air-vent valve and a deaeration chamber. The IP55 junction box simplifies electrical wiring.

The distribution box, powder-coated in white RAL 9010, can be wall-mounted, recessed, or installed inside a hanging cupboard.

Heat interface unit (hiu) for the production of domestic hot water (dhw) and the control of a mixed temperature heating circuit.

Two models available where the regulation of the circuit can take place at a fixed point with thermostatic mixing valve or at variable temperature, according to the external temperature, by means of a modern climatic control unit.

The module, pre-wired at the factory, requires a central-heating-pump suitably sized to supply the HIUs of all residential units.

The modular construction allows for the possibility of installing a water meter and a heat energy meter to accurately allocate the costs to individual residential units.

A connection with an isolation valve is also already provided for the cold water line.
All components of the HIU are appropriately sized to ensure the following performances even with heat energy produced by heat pumps.

Fixed point model

Temperature of the mixed circuit adjustable from 20 to 45°C by means of a thermostatic mixing valve.

Variable temperature model

Temperature of the mixed circuit managed by a modern climatic control unit that controls the mixing valve actuated with a 230V 3-point motor. Bus connection for remote room control (optional).

ModvlvS DN25

The ModvlvS DN25 series includes a complete range that meets all the installation needs with specific models: middle and low temperature heating systems, energy metering, cooling systems; everything with the possibility of a management control by means of climatic controllers even built-in the pump unit. DN25 pump units can be connected to heating systems with powers up to 50 kW, with a very low energy consumption ensured by high efficiency synchronous circulating pumps. The connections to the circuit or to the manifold are made with a 1” female thread. Moreover the pump units of M3 version are equipped with a by-pass balancing valve that allows an accurate regulation of the differential pressure of the circuit. The range is completed by various accessories and components: manifolds, fittings, safety units, mixing valves and servomotors.

M2 MIX33
2-WAY PUMP UNIT WITH 3-WAY MIXING VALVE
WITH BUILT-IN BY-PASS

The unit for 1” (180 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.
High efficiency synchronous pre-wired circulating pump (for the models that include it).
Flanged ball valve supplied with in-handle thermometer (red ring, range 0°C-120°C).

Return
Flanged ball valve with 20 mbar check valve (which can be excluded by rotating the handle by 45°) supplied with in-handle thermometer (blue ring; 0°C-120°C).
Magnetic filter (in the models where it is present)
“T” Connection for mixing valve.
Connection.

Integrated by-pass

The by-pass integrated into the 3-way mixing valve ensures a recirculation 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. In case of a bad working of the system causing an increase of the temperature of the installation, the recirculation through the by-pass allows a decrease of the water temperature in the underfloor installation, by 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 recirculation by-pass fully open.