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STESkW ed 05/06
EOLO Star 23 kW
Technical Documentation
Technical Documentation
Secondary circuit (D.h.w. circuit).
Operation.
When domestic hot water is drawn, cold water flows inside
the flow switch (4) which closes the electrical contact coupled
to it
(see the electrical circuit)
.
As a result, the adjustment circuit starts the d.h.w. priority
phase that ignites the burner (3) and, if there is an ongoing
central heating request, switches the boiler circulator off.
In this way, the heat in the fumes produced by combustion is
absorbed by the copper blades of the bithermal exchanger (2)
and transferred to the heating circuit water which, in turn,
transfers it to the domestic water circuit flowing through the
“cross-shaped” hot water circuit pipes (1).
D.h.w. flow switch.
Whenever hot water is drawn at a rate of at least 1.5 l/min and
with a dynamic pressure of 0.3 bar, the flow switch (2) enables
the boiler to operate in the d.h.w. mode.
This is done by means of a magnet that, by lifting when hit by
the flow of cold water, moves near to an electrical contact
(reed
relay)
causing it to move thanks to the effect of the magnet.
When the contact closes, which is located outside the pipe
through which the water flows, it enables the modulation board
to start the domestic hot water priority operating mode.
It consists of two blocks
(one in brass and one in plastic)
that
are coupled together and locked with a pin (3).
An 8.0 l/min
(2 bar)
flow limiter (1) is installed at the flow
switch exit.
Bithermal exchanger
(see the central heating circuit).
Note:
to ensure long life and have an exchanger that is always
efficient, we recommend installing the “polyphosphates dispenser
kit” if the water is likely to lead to scale forming. For example,
this kit is recommended when the hardness of the water exceeds
25 French degrees.
1
2
3
Cold domestic
water inlet
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