9
STESkW ed 05/06 EOLO Star 23 kW
Technical Documentation
Technical Documentation
Gas settings.
Maximum and minimum gas pressure settings are done by
means of the gas valve, respecting the values shown in the
tables relating to each appliance for the relevant type of gas
(see technical data).
e features of this appliance are such as to make it possible to
differ minimum pressure settings during operation in both
the central heating and domestic hot water modes.
e minimum gas pressure setting on the gas valve does in fact
correspond to the minimum pressure in the d.h.w. phase
(7.0 kW = 6,000 kcal/h) while, with regard to heating, the
minimum pressure (9.3 kW = 8,000 kcal/h) can be adjusted
by means of the “Minimum central heating power” param-
eter programmable on the integrated printed control board (see
Legend:
1 - Coil
2 - Minimum power adjustment screw
3 - Maximum power adjustment nut
4 - Gas valve outlet pressure point
5 - Gas valve inlet pressure point
6 - Protection cap
SIT 845 valve
integrated board programming).
A differential pressure gauge is used for reading the pressure: its
positive pressure point is connected to the gas valve (4) outlet
and its negative pressure point is connected to the positive
pressure point on the flange with holes located at the top of
the sealed chamber (see figure).
Gas valve SIT 845.
Setting maximum pressure.
Draw some domestic hot water after having put its temperature
selector on maximum.
Turn the brass nut (3) clockwise to increase pressure and in
the opposite direction to reduce it.
Setting minimum pressure.
(to be done after setting maximum pressure).
After turning
power off to the modulation coil, turn the screw
(2) clockwise to increase pressure to the burner and in the op-
posite direction to reduce it.
Converting gas type.
Adaptation to a type of gas different to the standard one the
boilers are intended for can be done by using the special kits
(natural gas or LPG).
Conversion consists in replacing the burner nozzles and
modifying the “P1” parameter programmable on the integrated
p.c.b. (see integrated board programming).
Maximum and minimum d.h.w. pressures are then set on the
gas valve in the way described above.
Maximum and minimum power in the central heating mode
can be set by means of parameters (see integrated board opera-
tion).
Burner ignition pressure is not set because the type of board
operation does not require this type of setting (see integrated
board operation).
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