Technical documentation
Technical documentation
STEM@ ed 06/01
8
EOLO MAIOR @
HYDRAULIC CIRCUIT
SECONDARY CIRCUIT
(D.H.W. CIRCUIT)
The models with instantaneous production feature a secondary hydraulic circuit that starts up
only
when
domestic hot water is run.
- OPERATION
Running the hot water results in transit of cold water inside the 3-way valve (1) and its consequent shift
to operating position
(see 3-way hydraulic valve operation
)
.
As a result, the return pipe (R) closes and the transit way is opened to the d.h.w. exchanger (2)
This way, circulation in the central heating system is prevented while this becomes possible in the plate
exchanger (2), inside which the cold water absorbs the heat in the primary circuit (
see d.h.w. exchanger
).
In this phase, the central heating function is disengaged and priority is given to the production of d.h.w.
- DOMESTIC HOT WATER EXCHANGER
This is a water-water exchanger consisting of
STAINLESS-steel plates placed one on top of the other
(15 in version 21 and 19 in version 24, 21 in version 27)
on the surface of which runs in counterflow the water of
the boiler circuit and the cold water for the d.h.w., and
through which the heat exchange occurs between the
two liquids.
To reduce mineral deposits to the utmost at the hot water
inlet, a single-acting valve (2) is fitted that prevents the
exchanger temperature from rising during operation in
central heating phase.
Hydraulic coupling is achieved by means of four O.R.
rings (1) for direct coupling to the 3-way enbloc to
which the exchanger is fastened.
