15
STEkW ed 12/06
EOLO Maior kW
Technical Documentation
Technical Documentation
Secondary circuit (domestic hot water circuit) for combi versions only.
Operation.
Running the domestic hot water causes cold water to flow
through the d.h.w. flow switch (1) and, as a result, the electrical
contact connected to it closes
(see the electrical circuit)
.
After this, the integrated board starts the domestic hot water
priority function phase whereby the burner is ignited and, if
there is an on-going central heating request, the 3-way diverter
valve (2) switches and moves into the working position
(see
operation of the 3-way hydraulic diverter valve).
This causes the return pipe (R) to close and the simultaneous
opening of the passage to the d.h.w. exchanger (3).
This prevents circulation in the central heating system while
it is allowed in the plate exchanger inside which the domestic
cold water absorbs the heat contained in the primary circuit
water
(see d.h.w. exchanger).
This means that the central heating function is off in this phase,
the production of domestic hot water having priority.
The water-water heat exchange takes place inside the d.h.w.
exchanger (3) which is fixed with screws to the d.h.w. outlet
body (1) and to the d.h.w. inlet body (2).
The part at the top of the left body allows the delivery water to
enter the primary circuit while the part at the bottom allows
the domestic hot water to exit.
Likewise, the top of the right body allows the domestic cold
water to enter while at the bottom, return of the primary
circuit.
The d.h.w. probe (4), by means of which the integrated board
is able to measure the temperature of the domestic hot water,
is mounted on the domestic hot water outlet body (1).
Primary circuit
delivery
Primary circuit
return
4
1
3
2
Primary circuit
delivery
Primary circuit
return
Domestic hot water
outlet
Domestic cold water
inlet
Summary of Contents for EOLO Maior kW
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