ModvlvS ModvFresh 2 T Manual

Pump unit to deliver fresh hot domestic water (DHW) ModvFresh 2 T
Rev.0 - 18/02/2021
Page 1 of 7
SAFETY: Please read carefully the
mounting and the setting working
instructions before starting the unit, in order
to avoid accidents and failures caused by
an incorrect use of the product. Please
keep this manual for future consultations.
(E) High efciency circulating
pump. High efciency circulating
pump compliant with European
Directive 2009/125/CE.
List of features of main components
D
F
C
A
Directions for installation
(F) Heat exchanger
Weld-braised plate heat
exchanger made in stainless
steel AISI 316. The heat
exchanger can be easily
removed for the service and/or
the cleaning.
(A) Miscelatore termostatico
The thermostatic mixing valve allows
to set the requested temperature
from 35°C up to 60°C. Please rotate
clockwise to reduce and anticlockwise
to increase the temperature, the
requested value (*) must clash
to the reference marked on
the valve body. Usually it is
appropriate to assure that the supply
temperature from the storage tank is
almost 10 K more than the requested
temperature.
(*) Knob corresponding temperature (with cold water 10°C and 65°C storage tank)
T° MIN 12345MAX
35-60°C 37 40 44 49 53 57 59
TAKE CARE
In this application, the circulator must
be set in constant speed mode.
Declared performances are reached
by selecting curve III.
E
(C) Flow switch
The ow switch detects the
water ow starting from
1.5 L/min, consequently
activating the circulator.
B
(B) Electric shunt box
The pump unit is supplied
pre-wired. It is not necessary
to operate on the electrical
connections.
(D) Check valve
Installed into the return
connection to the storage tank,
prevents back ow of energy.
Supply from
the storage tank.
F.i. 65°C
Hot domestic water.
F.i. 45°C
Water Supply
F.i. 10°C
Return to the
storage tank
EPP insulation box
Measurements: 277 x 417 x 137 mm.
A special metal back plate xes the unit
to the insulation box and it allows a quick
tting to the wall or to the storage tank.

Pump unit to deliver fresh hot domestic water (DHW) ModvFresh 2 T
Rev.0 - 18/02/2021
Page 2 of 7
Hydraulic and connection scheme
1
In presence of calcareous water, the high temperature of the supply way from the buffer tank can make
calcareous scales inside the heat exchanger. Therefore we suggest you to limit this temperature, by means of
a thermostatic mixing valve adjusted to the needed value (as indicated in the grey square).
*
2
3
4
SECONDARY CIRCUIT HEAD LOSSES
Technical Features
Maximum allowed pressure (without water hammer):
Working temperature:
Headloss in the secondary circuit at the ow of 20 l/min (50 kW model):
Headloss in the secondary circuit at the ow of 30 l/min (70 kW model):
10 bar
2 ÷ 95°C
5 mH2O
10 mH2O
Connections and links
Supply from the storage tank: 3/4” ISO 228 male connection.
Minimum diameter of the pipe DN20 (Cu 22x1).
Maximum length: 3 m.
Return to the storage tank: 3/4” ISO 228 male connection
with check valve. Minimum diameter of the pipe DN20
(Cu 22x1). Maximum length: 3 m.
1
2
Cold water supply: 3/4” ISO 228 male connection.
Minimum diameter of the pipe DN20 (Cu 22x1).
Hot domestic water outlet: 3/4” ISO 228 male connection
with check valve.
Minimum diameter of the pipe DN20 (Cu 22x1).
3
4
PRIMARY CIRCUIT SECONDARY CIRCUIT
Ball valve with red ring
thermometer
(temperature gauge)
*
Valve with blue
wing nut handle
Valves kit (optional)
REMARK
In this scheme some of the
hydraulics components
are not supplied but we
recommend to install them.
Approximate scheme only.
Auxiliary heating
from the boiler
Solar
installation
air vent
Expansion
vessel
Security
valve
Drain
Pict. 1: Layout of a plant for deliverying fresh domestic water by using ModvFresh 2 T
variant with thermostatic
mixing valve on the
supply way
Hot domestic
water supply
Ball valve with blue ring
thermometer
(temperature gauge)
Valve with red
wing nut handle
Anti water
hammer device
Pressure
reducer
Filter ball
valve
Drain
Expansion
vessel
Security
valve

Pump unit to deliver fresh hot domestic water (DHW) ModvFresh 2 T
Rev.0 - 18/02/2021
Page 3 of 7
EPDM
Heat exchanger
Pipe ttings
Copper alloy
CW617N / CW614N Copper EPP Stainless steel AISI 316 L Copper Cast iron
Piping Gaskets
Insulation Circulating pump
Materials
The pump unit can be mounted directly on the storage tank, if it is provided with the proper connections or to the wall, near by.
For the wall mounting follow the directions:
Find the position of the 4 holes to be made into the wall according to the scheme Pict.2;
Bore and put the proper screw anchors;
Remove the cover and x the pump unit;
Mount the connection valves set (optional) according to the Pict.1;
Connect the pipes in accordance to the connection scheme follwing the directions in Pict.3.
Installation
Pict. 3: Dimensions and main
center-to-center distances
of the pump unit
Pict. 2: Back plate for wall mounting
The pump unit has been tested under pressure leaking in the factory. Anyway we
recommend to check again the connections.
The storage tank must be put under pressure (about 2 bar).
Open slowly the valve in the position 1 (supply from the storage tank), purge the circuit,
open slowly the valve in the position 2 (return to the storage tank);
Open slowly the valve in the position 3 (cold water supply);
Open slowly the valve in the position 4 (hot domestic water outlet);
Open slowly one or more outlets for some minutes to let the air going out from the
secondary circuit;
Close the outlets;
Breathe out the storage tank and in case restore the pressure.
Filling
The pump unit is pre-wired.
A Shuko plug is necessary to
connect it to the electric system.
Voltage: 230 VAC ± 10%.
Frequency: 50÷60 Hz.
Maximum absorbed
power: 43 W.
DANGER
Electrical connections

Pump unit to deliver fresh hot domestic water (DHW) ModvFresh 2 T
Rev.0 - 18/02/2021
Page 4 of 7
PERICOLO DI USTIONI
Per impedire ustioni all’utenza, non
superare mai i 60°C di temperatura
dell’acqua erogata.
Minimum delivery capacity
To ensure a constant temperature of the DHW delivered, a minimum ow of delivery capacity is required. In the following table there is
an example of delivery with a cold water temperature of 10°C on the supply: minimum deliveries are shown necessary to ensure stability
at 45°C requested by the user, making various assumptions of water temperatures provided by the tank.
Water temperature on supply
from the tank
Minimum capacity for the model
ModvFresh 2 T 50 kW
Minimum capacity for the model
ModvFresh 2 T 70 kW
55 °C 2 l/min 2,5 l/min
60 °C 2,5 l/min 3 l/min
65 °C 3 l/min 3 l/min
70 °C 3 l/min 3,5 l/min
75 °C 3,5 l/min 3,5 l/min
80 °C 4 l/min 4 l/min
Calculation of performances
It is also possible to download an excel le from the site www.modvlvs.com dedicated to the calculation of the peformances
of the ModvFresh 2 T unit from where you cen get: output power, time of delivery, the overall delivery capacity and recovery
time of the temperature in the tank.
Suggestions / Remarks on the delivery capacity
The temperature into the storage tank must be almost 10K higher than the desired
temperature of the domestic water. Higher di󰀨erences of temperature allow to extend the
delivery time of the hot water. In presence of calcareous water we recommend not to
exceed the temperature of 70°C (supply from the storage tank) to avoid limescale into the
secondary side of the plate exchanger, in case put a thermostatic valve (Pict.1).
Diagrams of the pump unit performances
The following diagrams relate the user’s ow rate and the supply temperature to the bu󰀨er storage tank, according to the requested
temperature of DHW. This allows to identify the minimum supply temperature needed to supply DHW at a required temperature and
ow. Vice versa it is also possible to x which is the maximum usable ow at the selected DHW temperature, at the available supply
temperature. Performances are also due to the inlet temperature of the cold water from the water supply system; diagrams show three
possibilities with inlet water at 5°C, 10°C and 15°C.
How to read the diagrams
Example 1, shown in the next page (ModvFresh 2 T 50 kW, inlet at 10°C). In this case a DHW ow of 12 l/min at a temperature of 45°C
is required. Crossing the desired DHW temperature curve, it follows that the supply from the bu󰀨er storage tank must be almost 51,7°C.
Example 2, shown in page 6 (ModvFresh 2 T 70 kW, inlet at 10°C). This is the case in which the supply from the bu󰀨er storage tank cannot
go over 56°C and we want to see what can be the maximum suppliable temperature at the DHW of 45°C. Crossing the desired DHW
temperature curve, it follows that the ow cannot be over 19,3 l/min.

Pump unit to deliver fresh hot domestic water (DHW) ModvFresh 2 T
Rev.0 - 18/02/2021
Page 5 of 7
DHW pump unit: ModvFresh 2 T - 50 kW
Flow rate [l/min] Inlet water temp.: 5 °C
Primary circuit inlet temp. [°C]
DHW 40°C DHW 45°C DHW 48°C
Flow rate [l/min] Inlet water temp.: 15 °C
Primary circuit inlet temp. [°C]
DHW 40°C DHW 45°C DHW 48°C
Flow rate [l/min] Inlet water temp.: 10 °C
Primary circuit inlet temp. [°C]
DHW 40°C DHW 45°C DHW 48°C

Pump unit to deliver fresh hot domestic water (DHW) ModvFresh 2 T
Rev.0 - 18/02/2021
Page 6 of 7
DHW pump unit: ModvFresh 2 T - 70 kW
Flow rate [l/min] Inlet water temp.: 5 °C
Primary circuit inlet temp. [°C]
DHW 40°C DHW 45°C DHW 48°C
Flow rate [l/min] Inlet water temp.: 15 °C
Primary circuit inlet temp. [°C]
DHW 40°C DHW 45°C DHW 48°C
Flow rate [l/min] Inlet water temp.: 10 °C
Primary circuit inlet temp. [°C]
DHW 40°C DHW 45°C DHW 48°C

Pump unit to deliver fresh hot domestic water (DHW) ModvFresh 2 T
Rev.0 - 18/02/2021
Page 7 of 7
Synchrone high efciency circulating pump Wilo Para SC
TAKE CARE
3
7
RECOMMENDED
ADJUSTMENT MODE
NOT RECOMMEN-
DED ADJUSTMENT
MODE
1. Pump housing with screwed connections
2. Glandless motor
3. Condensate drain openings (4x around circumference)
4. Housing screws
5. Control module
6. Rating plate
7. Operating button for pump adjustment
8. Run/fault signal LED
9. Display of selected control mode
10. Display of selected pump curve (I, II, III)
Indicator lights (LEDs)
Operating button
• Signal display
• LED is lit up in green in normal operation
• LED lights up/ashes in case of fault
• Display of selected control mode Δp-v, Δp-c and
constant speed
• Display of selected pump curve (I, II, III) within the
control mode
• LED indicator combinations during pump venting
function, manual restart and key lock
Press
• Select control mode
• Select pump curve (I, II, III) within the control mode
Press and hold
• Activate the pump venting function
(press for 3 seconds)
•Activate manual restart (press for 5 seconds)
• Lock/unlock button (press for 8 seconds)
Venting
The pump venting function is activated by pressing and
holding the operating button (for 3 seconds) and automa-
tically vents the pump.
The top and bottom LED rows ash in turn at 1 second
intervals. To cancel, press and hold the operating button
for 3 seconds.
The heating system is not vented.
Manual restart
A manual restart is initiated by pressing and holding the
operating button (for 5 second) and unblocks the pump
if required
(e.g. after long standstill period in summer).
Lock/unlock the button
The key lock is activated by pressing and holding the ope-
rating button (for 8 seconds) and locks the pump’s current
settings. It protects against undesired or unauthorised
adjustment of the pump.
Funzioni
1II
2I
3III
4II
5I
6III
7II
8I
9III
Control modes
LED
display
Control
mode
Pump
curve
Constant speed
Constant speed
Variable differential
pressure
Δp-v
Variable differential
pressure
Δp-v
Variable differential
pressure
Δp-v
Constant differential
pressure
Δp-c
Constant differential
pressure
Δp-c
Constant differential
pressure
Δp-c
Constant speed
LED
display
Control
mode
Pump
curve
• The LED selection of control modes and corresponding pump curves
takes place in clockwise succession.
• Press the operating button briey (approx. 1 second).
• LEDs display the set control mode and pump curve.
3
3
3
7
7
7
7
7
7
1
2
3
4
58
9
10
7
6