BRV Bonetti Rubinetterie Valduggia S.r.l.

MODVLVS

Regolare e distribuire energia pulita

ModvFresh Basic

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

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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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°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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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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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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Logico

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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1610

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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ModvFresh 2

Pump unit to deliver fresh hot domestic water (HDW) with electronic control and high efficiency pump
Employment: on inertial cylinders (buffer tanks) connected to standard thermal heating systems, heat pumps, thermal solar and biomass systems. It provides fresh hot domestic water, avoiding phenomena of bacterial pollution, such as the legionnaire’s disease, due to the stagnation of the hot water. The compact size allows an easy installation even on small cylinders.

The unit, by a special electronics, modulates the speed  of the primary high efficiency circulating pump, from a minimum speed of 10% up to 100%, in order to provide always a precise temperature of exploitation (f.i. 45°C). The variation of the requested flow is suddenly recorded by a digital sensor that gives the inputs of flow and temperature.

Two models are available, fully assembled and pre-wired:
  • 50 kW, with flow up to 20 l/min, for domestic use installations;
    70 kW, with flow up to 30 l/min, for heat pumps up to 18 l/min;
Selction chart to deliver HDW at 45°C with cold water at 10°C:
Heat source Buffer tank
temperature
Flow Return
temperature
Code
Heat pump 52 °C 15 l/min 33 °C 031300-70-30
55 °C 18 l/min 31 °C 031300-70-30
Gas, biomass,
boiler, thermal
60 °C 20 l/min 33 °C 031300-50-20
68 °C 30 l/min 29 °C 031300-70-30

Features:
  • High Efficiency circulating pump;
  • Delivered hot water temperature: 45°C with supply water temperature at 10°C.
    The HDW temperature is adjustable every single degree from 30°C up to 70°C;
  • A big surface heat exchanger weld-braised made of stainless steel AISI 316 guarantees a remarkable thermal exchange that allows a water return to the buffer tank at a temperature up to 25°C;
  • The heat exchanger can be easily removed in case of maintenance and/or cleaning;
  • Counting of used energy by means of the digital sensor (cold water temperature fixed at 10°C);
  • PPE insulation box (277 x 417 x 137 mm). A special back plate fixes the unit to the insulation box and it allows a quick fitting to the wall or to the cylinder;
  • The pump unit is supplied with 3/4” Male connections (pipe-union).
  • Version with electronics made for the control of the recycling line: pre-wired external box with electric wirings for the control of the circulating pump and the relevant contact temperature sensor.
A special ball valves kit, on request (to be ordered), completes the installation.
FIELD OF UTILIZATION:
For a maximum power of 70 kW and flow up to 30 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 up to 70°C.


Technical features

Maximum allowed pressure (without water hammer): 6 bar

Working temperature:
2 ÷ 95 °C

Headloss in the secondary circuit at the flow of 20 l/min (50 kW model):
3 mH2O

Headloss in the secondary circuit at the flow of 30 l/min (70 kW model):
6,5 mH2O

Connections size: min. DN20 (Cu 22x1) near the cilynder.






















On demand, a test report of the VFS is available. It shows the result of the tests made directly in the Grundfos Lab.

Pump unit assembled with optional ball valves kit


Calculation of the performances of the pump unit

  Click on the icon here at side and download an Excel file dedicated to the calculation of the performances of ModvFresh pump units. Starting from the installation data and taking into consideration the diagrams of the following section the supplied power, the supply time, the overall flow and the re-establishment time of the storage tank temperature are calculated. Changing the starting data you can simulate various and different utilization situations and do your remarks.

Diagrams of the pump unit performances

The following diagrams relate the user’s flow rate and the supply temperature to the buffer storage tank, according to the requested temperature of HDW. This allows to identify the minimum supply temperature needed to supply HDW at a required temperature and flow. Vice versa it is also possible to fix which is the maximum usable flow at the selected HDW temperature, at the available supply temperature.


HDW pump unit ModvFresh 2 - 50 kW








 
 
HDW pump unit ModvFresh 2 - 70 kW








 
The buffer temperature must be almost 5 K higher than the desired temperature of the domestic water. Bigger temperature differences allow to extend the tapping time.

DANGER OF SCALDS: To avoid scalds to the users, the temperature of hot water supplied must never be more than 60°C. This temperature limits is preselected into the controller, anyway it can be reduced.
Units without recycling control:
Code 50 kW, 3/4”: 031300-50-20
Code 70 kW, 3/4”: 031300-70-30

Units with recycling control:
Code 50 kW, 3/4”: 031310-50-20
Code 70 kW, 3/4”: 031310-70-30