18
STESkW ed 05/06
EOLO Star 23 kW
Technical Documentation
Technical Documentation
Electrical circuit.
D.h.w. phase.
Operation.
By selecting the
(Summer) or (Winter) functioning
mode with the (S2) push button the boiler is enabled to work
in the domestic hot water mode.
When some domestic water is drawn it causes the d.h.w. flow
switch (S4) contact to close and enables operation in the
d.h.w. mode.
The boiler circulator (M1) is not started in the domestic hot
water mode or is switched off if there is an ongoing central
heating request
upon opening of relay K3.
If the temperature read by the NTC d.h.w. probe (B2) is below
the value set on the boiler’s control panel
(or on the CRD if
installed)
and if the fumes pressure switch contact (S6) is idle
“NC”, the adjustment circuit powers the fan (M20) by means
of relay K4.
If the contact of the system pressure switch (S5) is closed
(pres-
sure in the primary circuit higher than the minimum value)
the
board, being enabled by the safety thermostat (E4) and with
switching of the flue pressure switch to “NO” (S6), closes the
contact of the request relay K2 which causes the 2 contacts
to close and the ignition cycle to start, first of all triggering
the ignition electrode (E1) and then both the coils of the gas
valve (Y1).
Burner ignition is detected by the integrated board by means
of the ionisation electrode (E2).
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Summary of Contents for EOLO Star 23 kW
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