Immergas EOLO Star 23 kW, Техническая документация инструкция

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STESkW ed 05/06 EOLO Star 23 kW
Technical Documentation Technical Documentation
D.h.w. request.
When some domestic water is drawn it causes the d.h.w. flow
switch (S4) contact to close and enables operation in the do-
mestic hot water mode.
When the boiler is working in the d.h.w. mode the boiler
circulator (M1) is not started or is switched off if there is
an ongoing central heating request.
For burner ignition proceed in exactly the same way as for the
central heating mode.
During the first few seconds after the gas valve (Y1) has been
powered, the current to the modulation coil (Y2) is limited to
the predefined soft ignition current.
Once the flame is detected, the signal to the modulation coil
is increased so as to reach the maximum power set on the gas
valve immediately (if requested) .
Flame modulation then occurs with reference to the difference
between the temperature set on the boiler control panel and
the temperature detected by the d.h.w. probe (B2).
When the temperature of 65°C is exceeded, the contact of
relay K2 is opened and reclosed as soon as the temperature
drops below 64 °C.
An increase in delivery temperature that goes beyond the trig-
gering limit point (80°C) causes a proportional reduction in the
modulation current in order to limit such a temperature.
If delivery temperature still reaches the switching off point
(90°C limit) the burner is switched off and a post ventilation
phase is carried out.
Central heating antifreeze request.
When the temperature read by the central heating delivery
probe (B1) drops below 4°C, the board enables ignition and
keeps the boiler going with the burner at minimum power until
a boiler temperature of 42°C is reached (radiator antifreeze) .
Domestic hot water antifreeze request.
If the temperature read by the d.h.w. probe (B2) drops be-
low 8°C, the integrated board enables ignition of the boiler
circulator.
If, on the other hand, the temperature read by the d.h.w. probe
(B2) drops below 4°C, the board enables boiler ignition and
keeps it going with the burner at minimum central heating
power until the d.h.w. probe (B2) reads a temperature of 8°C
after which a post circulation cycle is activated in the central
heating mode that lasts 150 seconds.
The water in the primary circuit is kept below 42°C during
operation because if this temperature is reached the board
switches the burner off.
“Chimneysweep” request.
Pressing the “Reset” push button (S3) for at least 10 seconds
and releasing it, the board enables ignition of the boiler and
keeps it working at maximum central heating power set for
15 minutes.
During this time only the limit thermostat function is observed
(90°C) which is carried out by means of the central heating
delivery probe (B1).
The function is indicated on the boiler display, with the (
and ) symbols flashing; it cannot work if there is an ongo-
ing d.h.w. request.
It can be interrupted by cutting power to the circuit, putting
the boiling in Stand-by ( ), either carrying out a d.h.w.
request or after 15 minutes.
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