Rizzoli ST Série Manuel D'utilisation page 122

ST 90
5 4 2 3
600
Picture 19 - On ST 90 model the boiler corresponds always with the combustion chamber. In this picture you can see the
model with combustion chamber on the left and flue outlet on the right front sight). The model with flue
outlet on the left is symmetrical.
1) Connection thermostat detector ø 1/2'' female
2) Going connection ø 1''1/4 female
3) Connection for thermal discharge detector ø 1/2'' female
4) Connections for thermal discharge circuit ø 1/2'' male
5) Return connection ø 1''1/4 female
6) Connection discharge ø 1/2" female
7) External air intake (optional)
3.5 SAFETY
On every solid combustible based boilers it is
not technically possible to break the combus-
tion immediately as happens for boilers based
on liquid or gas combustible according to ne-
cessity. For this reason, it is important to swal-
low always the produced heating also even if
the heating system does not request that and
also in case of lack of AC power. On contrary,
the water in the boiler could boil without pos-
3.6 THERMAL DISCHARGE
For more safety, it is possible to make an
auxiliary circuit of thermal discharge con-
nected directly to the boiler. The thermal
discharge circuit is mandatory in case of
closed expansion tank installation. The ther-
mal cooker has a predisposition for this solu-
tion. The thermal discharge system allows to
6 7 1 4
802
792
741
691
483
463
102
120
ST 60
6 1 4 7
900
sibility of outlet, with serious danger of explo-
sion of the boiler and serious injury risk for the
people present near the thermal cooker.
For this reason, we recommend to follow
strictly what is written in UNI 10412-2 law in
the various cases and we suggest also to insert
in the system also a boiler able to accumulate
the heating in excess produced as sanitary hot
water.
cool directly the boiler when it is necessary
by making flow cold leaking water in a sep-
arate circuit inside the boiler.
The making of the thermal discharge system
is under responsibility of the installer. All the
components of the thermal discharge system
external to the thermal cooker must be ob-
3 2 4 5
799
763
745
676
463
448
87