How It Works - Rizzoli ST Série Manuel D'utilisation

4. HEATING SYSTEM
4.1

HOW IT WORKS

The STK thermal cooker is endowed with a
boiler to exploit the heat produced by the
device through a system with a carrier fluid
for heating and instantaneous production
of sanitary hot water.
The transfer of the heat from the thermal
cooker to the thermosanitary system is
made by a plate heat exchange based sys-
tem and through two circulation pumps (P1
and P2) included in the kit and ruled by the
electronic control unit.
When the thermal cooker is working, the
water inside the boiler gets warm. When
it reaches a fixed temperature, the water
starts to circulate in the internal circuit of
the thermal cooker through the pump P1.
Through the plate heat exchanger, the heat
transfers to the circuit of the heating system
VST
S1
Picture 24 - Scheme of STK kit
CAPTION
F
Cold water entry - ½"M
H
Sanitary hot water outlet - ½"F
A
Going heating system - ¾"F
R
Return heating system - ¾"F
S1
Safety discharge - ¾"M
S3
Maintenance discharge
P1
C
VS2
S3
C
Boiler
SP
Plates exchanger
P1
Internal system pump
P2
Circul. pump heating system
GR
Refuel group
VE
Closed expansion tank
124
(STK)
or the circuit for the production of sanitary
hot water. Note that the liquid inside the
boiler of the thermal cooker and in its in-
ternal circuit is not directly in touch with the
water of the thermosanitary system. They
are separate circuits with different pressures
and temperatures.
The circulation of the hot water inside the
heating circuit is made by the pump P2.
The sanitary hot water circuit works thanks
to the pressure of the incoming cold water
pressure.
The STK thermal cooker is predisposed with
a thermal discharge system integrated with
serpentine inside the boiler. In this way, in
the closed internal circuit the safety is guar-
anteed.
GR
VS1
VE
SP
VS1
VS1
VS2
VST
VNR
F
H
R
VNR
P2
A
Automatic vent hole
Overpressure valve
Thermal discharge valve
No return valve