17
STMiN3E ed 09/11 MINI NIKE 3 E
Technical Documentation
Technical Documentation
1
1
DHW ow switch (2)
With respect to drawing DHW with a ow rate of at least 1.5
l/min and a dynamic pressure of 0.3 bar, the ow switch (1)
enables the boiler functioning in DHW mode.
is takes place by means of a magnet which, lifting when
it is hit by the ow of domestic cold water, approaches an
electric contact (reed relay) and causes shifting due to the
magnetic eect.
e closure of the contact, which is positioned outside the
pipe where the water passes, allows the integrated modulation
P.C.B. to start the DHW priority function mode.
It is made up from two parts (one in brass and one in plastic)
that are coupled and locked with a pin.
A lter (2) is lodged inside of it.
It is attached with two screws to the body of the DHW inlet
(4), which, in turn, the system lling group is connected to.
A 7.1 l/min ow limiter is inserted at the outlet of the ow
switch (3) (at 2 bar).
DHW heat exchanger
is is a water-water heat exchanger composed of 12 stainless
steel plates laid one on top of the other, where the water from
the boiler circuit and domestic cold water ows over their
surfaces, against the ow, and where the heat exchange occurs
between the two liquids.
e hydraulic coupling is obtained by using four gasket seals
(1) that allow it to be connected directly to the domestic water
inlet body and domestic water outlet body.
Domestic cold
water inlet
Flow
circuit
primary
Return
circuit
primary
Output
water
hot
domestic
water
Inlet
water
cold
domestic
water
1
2
3
4
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