ModvFresh 1

Pump unit to deliver fresh hot domestic water (HDW) with thermostatic controller

Employment: on the inertial cylinders or similar, connected to solar thermal installations, wood, pellets, biomass boilers etc. when the stratification is not a primary requirement.
It provides fresh hot domestic water, avoiding phenomena of bacterial pollution, such as the legionnaire’s disease etc., made by the stagnation of the hot water.
ModvFresh 1 is provided with a weld-braised plate heat exchanger made in stainless steel AISI 316 and with a thermostatic mixer adjustable from 45 up to 70 °C.

Two models are available, fully assembled and pre-wired:

50 kW, with variable flow up to 20 l/min, for domestic use installations;
100 kW, with variable flow up to 40 l/min, for small commercial installations;

with the followings specifications:

Very low headlosses. The circulating pump starts to run at flows less than 1 l/min thanks to a differential manostat;
No electric wirings are requested: the unit is pre-wired and shop tested;
Easy temperature adjustment, by means of the graduated knob of the MultiMix thermostatic mixer;
The heat exchanger can be easily removed in case of maintenance and/of cleaning;
PPE insulation box (398 x 500 x 207 mm). A special back plate fixes the unit to the insulation box and it allows a quick fitting to the wall or to the solar cylinder;
The pump unit is supplied with 3/4” Male connections (pipe-union).

A special ball valves kit, on request (to be ordered), completes the installation.

FIELD OF UTILIZATION:
For a maximum power of 100 kW and flow up to 40 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 up to 70 °C.

Technical features

Max allowed pressure:	6 bar
Working temperature:	2 ÷ 95 °C
Setting accuracy of Multimix Mixing Valve (model 50 kW):	±1°C (Kvs 2,5)
Setting accuracy of Multimix Mixing Valve (model 100 kW):	±2°C (Kvs 4,0)
Headloss in the secondary circuit at the flow of 20 l/min (model 50 kW):	3 mH₂O
Headloss in the secondary circuit at the flow of 40 l/min (model 100 kW):	9 mH₂O

Minimum diameter size of the pipes: DN20 (Cu 22x1).

Hydraulic scheme

(1)	Circulating pump	(4)	Differential manostat
(2)	Plate heat exchanger	(5)	Check valve
(3)	Thermostatic mixing valve

Unit assembled with optional ball valves kit

Return temperature to the storage tank

The return temperature to the storage tank is variable and it depends on the temperature and flow conditions. For instance if the supply temperature of the storage tank is high, the return temperature, after the thermic exchange into the heat exchanger, will be consequently and proportionally high. This fact is enlarged with small user’s flows (small heat exchange) and it decreases with big user flows (high heat exchange). Therefore, if you do not want to destroy the stratification of the storage tank, we suggest to install a thermic valve on the return line to the storage tank to “charge” the tank at different levels at the requested temperature.

ModvFresh 1 parallel connection

If high flows and powers are requested it is possible to make a parallel connection of up to five ModvFresh 1 (100 kW model) to supply up to 200 l/min and a nominal power of 500 kW without installing any other device such as electronic controllers, motorized valves, flow sensors, etc.

The connecting scheme is particularly suitable for installations where the request of flow from the user is nearly constant, this to optimize the power consumption of the circulating pumps that are all activated at a very small flow; the control of the temperature is anyway assured during the whole use of the flow.

n the following file the main working parameters of the ModvFresh 1 on parallel connection are shown (the data have been obtained at a cold water inlet temperature of 10 °C). For an accurate measuring, please contact our Technical Department.

ModvFresh 1 100 kWpump unit to deliver HDW: installation on parallel connection

Requested flow [l/min]	Number of ModvFresh 1, 100 kW	Hot water selected temperature [°C]	Supply required temp. (storage tank) [°C]	Supplied power [kW]	Minimum diameter of the pipes [mm]
80	2	50	70	224	28x1,5
120	3	50	70	336	35x1,5
160	4	50	70	448	35x1,5
200	5	50	70	560	42x1,5

FIELD OF UTILIZATION:
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 up to 70 °C;
Temperature stability ±4 °C;
Return temperature to the storage tank: see specific section.

Code 50 kW, 3/4”: 031100-50-20
Code 100 kW, 3/4”: 031100-100-40