12
STEEkW ed 01/06 EOLO Extra kW
Technical DocumentationTechnical Documentation
Primary
circuit
delivery
Primary
circuit
return
D.h.w. flow switch (2).
Whenever domestic hot water is drawn at a rate of at least 1.5
l/min and a dynamic pressure of 0.3 bar, the flow switch (2)
enables the boiler to work in the d.h.w. mode.
is is done by means of a magnet that, lifting when hit by the
flow of domestic cold water, moves near to an electrical contact
(reed relay) causing it to move thanks to the magnetic effect.
When the contact closes, which is located outside the pipe
through which the water flows, it enables the adjustment board
to start the domestic hot water priority phase.
It consists of two parts (one in brass and one in plastic) that are
coupled together and locked with a pin.
A G1/4” thread on its body connects it to the filling unit
(3).
An 7.0 l/min (2 bar) for model 24, 9.0 l/min (2 bar) for model
28 and a 11.5 l/min (2 bar) for model 32 is installed at the
flow switch exit.
D.h.w. exchanger.
is is a water-water exchanger consisting of stainless steel
plates placed on top of each other (16 in the 24 kW version,
20 in the 28 kW version, and 22 in the 32 kW version) on the
surface of which flows, in counter current, the water of the
boiler circuit and the domestic cold water and through which
heat exchange occurs between the two liquids.
For the hydraulic coupling four O rings (1) are used that al-
low direct coupling to the d.h.w. inlet body and to the d.h.w.
outlet body.
D.h.w.
outlet
Cold
water
inlet
Cold
water inlet
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