Rizzoli STP Série Manuel D'utilisation page 93

3.10 EXPANSION TANK
Every closed hydraulic circuit subjected to
variations of temperature must have a de-
vice which allows the variation of the flu-
id contained. The system integrated in the
thermal cooker with open expansion tank
works for the boiler and the internal tank
of the thermal cooker. The secondary circu-
it for the heating system, being separated,
requires a dedicated and well dimensioned
3.11 SAFETY
In every solid combustible based boiler it is
not technically possible to break up immedi-
ately the combustion as it happens for the
liquid/gas combustible based boilers when
necessary. Because of this there is the need
to drain always the heating produced, even
if the system does not require it or in case
of lack of electricity: when this happens, in
STP thermal cooker the water may come to
the boil but the generated steam is ejected
by the safety discharge. STP thermal cook-
er shall be intended as a solid combustible
generator endowed with an internal prima-
ry circuit with natural circulation endowed
with open expansion tank and a heating
3.12 CONNECTION IN PRESENCE OF ANOTHER
HEAT GENERATOR
The thermal cooker may be easily matched
also to another heat generator. It is recom-
mended to contact a technician or an expe-
rienced installer in order to plan a duly sys-
tem. It is necessary to mind that the thermal
cooker must have the precedence on every
other heat generator, because when using
solid combustible it is not technically possi-
ble to break up immediately the combustion
3.13 CALCAREOUS WATER
Hard water with high residual saturation
may create deposits inside the water cir-
cuits. The continuous use in these conditions
may damage the device. In these cases, it is
according to dimensions of the thermal sy-
stem expansion tank, to be installed by a
technician.
The expansion tank for the heating system
may also be closed. When connecting to an
existent system or when there is another
heat generator, the expansion tank might
exist and be ready for use.
exchange system with two secondary cir-
cuits separated from the primary one: one
for heating and one for the production of
sanitary hot water.
For this reason, the thermal cooker can be
installed in total security as indicated in the
referring laws for what deals with open ex-
pansion tank installations, considering that
in this case are already present these safety
devices: open expansion tank, thermometer,
acoustic alarm. The secondary circuit may be
installed with closed expansion tank, with-
out need to make a thermal discharge sys-
tem with serpentine inside the boiler.
if necessary. This can be managed manually
but it can also be automatic, using the ad-
vanced features of the control unit of the
thermal cooker.
With the correct electric connections, the
control unit can manage the working of the
other heat generator for both heating and
production of sanitary hot water.
recommended to install a softener upstream
the entrance of the water inside the thermal
cooker, to be chosen according to the fea-
tures of water.
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