BRV Bonetti Rubinetterie Valduggia S.r.l.


Regolare e distribuire energia pulita

°Caleon Thermostat - Wi-Fi

Elegant chrono-thermostat with TFT capacitive touch panel. Wi-Fi N 2.4 Ghz connection for remote control by °Caleon app.

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Mixing kit for ModvFresh Basic

35÷60°C thermostatic mixing kit designed for ModvFresh Basic, with anti-scald thermostatic mixing valve for small applications.

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Multifunctional compact hydraulic module for the management of a direct circuit, a mixed circuit and the production of domestic hot water (DHW)

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Full bore 2-way zone ball valve, with bidirectional actuator with quick connection. Dimensions from 1/2" DN15 to 1"1/4 DN32.

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726 - Basic Series

Anti-scald thermostatic mixing valve for medium and small applications. Compact size. Available Kvs: 1.5, 1.8 and 3.4 (news from October 2019).

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DomvS Clima

Control unit for manifolds of heating and cooling radiant panels up to 200 m2. Fixed point thermostatic mixer or motorized rotary mixing valve. LCD room control unit.

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ModvFresh Basic

Compact heat exchange unit to deliver fresh domestic hot water (DHW).

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System to connect on cascade several HDW pump units ModvFresh for installations requiring high power and flow
ModvFresh Kascata is an innovative management logic that allows to connect on cascade up to five standard ModvFresh pump units to deliver fresh hot domestic water, getting a maximum water flow of 200 l/min and a supplied thermic power of nominal 500 kW.

This system is suitable for inertial water tanks of big installations connected to solar themal plants, to wood or pellet or biomass boilers etc. It provides the instantaneous production of hot domestic water avoiding phenomena of bacterial pollution (such as the legionnaire’s disease) caused by hot water stagnation.

The installation is managed via bus by a master servomotor (ModvMaster, connected to the first ModvFresh unit) that, acquiring the value of the water flow delivered by the domestic water plant, consequently activates the other HDW units, controlling the pertinent fast actuation slaves servomotors (ModvSlave). The requested water flow is registerd by a  sensor VFS 10-200 l/min placed on the main cold water distributor. The Kascata system is very flexible and it can be planned and carried out with a modular approach, depending on the specific requirements of the installation.

Remark: temperature values marked with an asterisk (*) have to be considered as nominal.
For more information, please refer to the section “field of utilization”

Main technical specifications
  • Possibility to connect 2 up to 5 ModvFresh 4 units, to get up to 200 l/min and 500 nominal kW;
  • Control of the return temperature to the water tank optimized by every working unit, thanks to the function of speed modulation of the primary circulating pump.This adjustement allows to decrease the return water temperature to the buffer tank down to 15°C: for this reason no devices for the control of the stratified return are needed;
  • Wide field of utilization: suitable for commercial installation, hotels, sport halls etc;
  • ”Routine” function that starts up uniformly every HDW unit, on the base of the worked time, allowing a working load equally distributed on the installed units;
  • Possibility to enlarge the system (later on) with additional units, in case of increase of power and flow request;
  • Progressive working of the system without water hammers, thanks to the use of ModvSlave technology to control the starting valves. The unit is started up or switched off in only 5 seconds;
  • Possibility to manage a recycling line using, as last element of the system, a ModvFresh unit with recycling. Recycling timetables, temperature, flow can be set directly on each device;
  • Metering of the heat quantity produced by every unit of HDW system.

List of components of control system of the installation


Primary servomotor (master) 24 volt AC/DC 35 seconds working time.
ModvMaster is placed on the ball valve of the cold water inlet of the first ModvFresh and, thanks to the bus line, it controls every ModvSlave servomotor installed in the system. Its logic control is also enabled to get flow information read by the VFS digital sensor.
The indentification number assigned directly at factory to ModvMaster is no. 1


Secondary servomotor (slave) with fast actuation time of 5 seconds. ModvSlave is identified at factory on the base of the number of elements which constitute the cascade system (f.i. no.2, no.3, etc.) and necessarily it must be placed on the ball valve of the cold water inlet of the coresponding HDW unit ModvFresh (f.i. no. 2, no. 3, etc.).


Set ball valve and flow rate limitation fitting

Set composed of:

- 2-ways On-Off ball valve suitable for drinking water. Bronze body. Yellow finish.
Ends threaded ISO 228 (DIN 259 BSP 2779).
Equipped with housing system for ModvMaster and ModvSlave servomotors.
Kvs value: 12,0.
Dimension: 1” Male connections.

- 1” x 3/4” male fitting equipped with flow limiter 38 L/min.


VFS Sensor

Flow sensor VFS 10-200 l/min. Composite material body.
Power supply 5 VDC.

Dimension: connections 1”1/4 Male.

Flow sensor code:
Cable code: CAVOVFS10-200

Signal converter for VFS sensor

Signal converter for VFS sensor. Its function is to provide the power supply to the sensor VFS 10-200 l/min and to send the flow inputs to the servomotor ModvMaster.
Power supply 230 VAC. IP 20.

It can be placed on 35 mm DIN guide.


General information concerning the selection of components

Please read the here below list as a reference to select the components necessary to carry out your ModvFresh Kascata. n particular, according to the specific power and flow requirements, please find here after the number of pieces of every individual component necessary to build the plant.

HDW  ModvFresh Kascata system up to 500 nominal kW

Components list

Units necessary according to the requested powers and flows
200 kW
300 kW
400 kW
500 kW
ModvFresh units
2 pcs 3 pcs 4 pcs 5 pcs
ModvMaster VLR24A-LP/DWCE 1 pc 1 pc 1 pc 1 pc
ModvSlave LRQ24A-MPL/E 1 pc 2 pcs 3 pcs 4 pcs
Ball valves R415D-SET 2 pcs 3 pcs 4 pcs 5 pcs
VFS sensor VFS10-200 1 pc 1 pc 1 pc 1 pc
Cable for VFS sensor CABLEVFS10-200 1 pc 1 pc 1 pc 1 pc
Signal converter for VFS sensor SI010 1 pc 1 pc 1 pc 1 pc
Kascata with recycling (*) 031415-100-40
1 pc 1 pc 1 pc 1 pc
Servomotors power supply
24V AC/DC, 100VA, 50 W
Feeder not included in the supply 1 pc 1 pc 1 pc 1 pc

(*) If the cascade system requires a recycling line, during the stage of selection of components, it will be necessary to replace one of the standard ModvFresh units with the model with recycling. See the table reported above fot the choice of the model.
As an example, assuming to make a 4 units installation (400kW - 160 l/min) with recycling, it would be necessary to foresee the installation of three ModvFresh 4 standard units (code 031400-100-40) and one ModvFresh 4 unit with recycling (code 031415-100-40). In total 4 units, as shown on the above list. To make the installation easier we suggest to set up the recycling unit always as the last element of the cascade.

Technical and dimensional specifications

For a maximum nominal power of 500 kW and flow up to 200 l/min.
Nominal supply temperature of the storage tank: 60°C.
Nominal temperature of the water supply: 10°C.
Nominal temperature of HDW production: 45°C, adjustable from 30°C to 70°C.
Recycling line temperature adjustable from 10°C up to 40°C.

Minimum pipings diameters
No. of ModvFresh
 pump units, 100 kW
pipings [mm]
Recycling line pipings
(if present)
2 pcs DN25 (Cu 28x1,5) DN15
3 pcs DN32 (Cu 35x1,5) DN15
4 pcs DN32 (Cu 35x1,5) DN20
5 pcs DN40 (Cu 42x1,5) DN20

To avoid scalds to the user the supplied water must never be over 60°C. This temperature limit is preselected into the controller, anyway it can be reduced.
The controller of the product ModvFresh with recycling line, in order to avoid the bacterial pollution in the HDW circuit, is equipped with a specific disinfection program that rises significantly the temperature in the recycling line, killing the eventual bacteria inside. Consequently, during this operation, also the hot water to the user reaches very high temperatures, causing the risk of instantaneous scalds. Therefore, it is raccomended to set the start of the disinfection’s program in a time when the water request from the user is low (f.i. during the night) and, however, to instal a security anti-scald device in the outlets considered dangerous.

Calculation of the performances and sizing of the Kascata system

  Click on the icon here at side and download an Excel file dedicated to the sizing and calculation of the performances of ModvFresh Kascata System. Changing the starting data you can simulate various and different utilization situations and do your remarks.

Main working methods of the installation

ModvFresh Kascata has several working methods, according to the user’s requirements (for exemple a 3 units installation is schematized).

Starting of the installation and selective activation of the units

In the starting configuration, without any user’s requirement, the first ModvFresh (master) is in effectiveness condition (to be more precise it is in stand-by) because the isolating valve managed by ModvMasteris usually open.
After the request of the first user, the ModvFresh number 1 is activated and it starts to produce hot domestic sanitary water.
Then, according to the increase of users and, consequently, of the requested flow, the VFS sensor progressively registers this increase and sends this input to ModvMaster that controls the opening of the isolating valves placed on the cold water inlet of every unit and, consequently, the starting of the slave units necessary to allow the requested mixed water flow (in the scheme at side the requested flow is given by units 1 and 2).
Therefore, in this working mode, every individual unit is activated or deactivated according to the variation of the request of hot water.

Stop of the installation and routine function

Once the user’s request stops, ModvMaster operates the closing of all the isolating valves except the one of the priority unit. It is important to say that it does not coincide necessarily with the unit number 1 (on which ModvMaster is placed), because it is the routine function that determines, time by time and according to the worked hours of every unit, which one has to be kept in stand-by.
When a new user’s request is coming, the unit which, in that particular moment, is considered primary will start up giving again the flow and, if necessary, ModvMaster will operate on the insulating valves of other units, bringing back the system into the condition of scheme 1.
The importance of the routine function is fundamental, in fact it allows a balanced load on all the units of the system.

Recycling line

If the planning of the installation requires a recycling line, it is possible to manage this function by installing, as the last element of the cascade (to simplify the hydraulic connections), a
ModvFresh unit with recycling.
The starting time bands and the recycling line temperature can be set directly on the built-in controller of the special unit.