5
GENERAL INFORMATION
1.3
Description of the appliance
Steel Pro Power
is a modular, premixed condensing system,
consisting of a cascade of modulating thermal elements in-
stalled inside a frame assembled in anodised aluminum and
painted panels.
The standard product is suitable for indoor installation, with
open chamber combustion; it can be transformed either into
sealed combustion or into indoor version by means of some
specific accessory kits that increase its electrical protection up
to IPX5D.
The cabinets are equipped with 2, 3 or 4 thermal elements from
57 up to 131 kW, for a total power of 114 up to 524 kW and are
available in versions that have low-consumption pumps ("P"
versions) or 2-way valves ("V" versions).
The models with heat-exchanger from 131 kW (270-2 P/V - 405-3
P/V - 540-4 P/V) are suitable for cascade installation, with side
by side coupling, up to a maximum of 10 total thermal elements
and a power of 1310 kW.
The optimal management of combustion allows both high effi-
ciency levels (exceeding also the 109%, value calculated on the
PCI, under condensation) and low pollutant emissions (Class 5
according to UNI EN 297).
The main technical features of the appliance are:
− pre-mix burner with constant air-gas ratio;
− helicoidal heat exchanger with double coil with smooth
stainless steel pipe, to guarantee good corrosion resist-
ance and the option of operating with high
∆
ts (up to
40°C), reducing system set-up times;
− power from 114 to 524 kW;
− maximum flue gas output temperature 100°C;
− microprocessor management and control with self-di-
agnostics, shown by means of a display, and logging of
main errors;
− Anti-Frost function;
− external probe that enables the climate control function;
− provision for room thermostat / heat request on high or
low temperature zones;
− option to manage a CH circuit and a DHW circuit with
storage tank;
− high efficiency pump with high residual head mounted
on all "P" versions
1.4
Safety devices
All the functions of each thermal element are electronically con-
trolled by a board approved to perform safety functions with
dual processor technology.
Any malfunction results in the appliance being shut down and
the automatic closure of the gas valve.
On the water circuit of each thermal element are installed:
−
Safety thermostat
.
−
Flow sensor
capable of monitoring the main circuit's
flow on an ongoing basis and of stopping the appliance
in the event of insufficient flow.
−
Temperature probes
on the flow and return that con-
tinuously measure the difference in temperature (
∆
t)
between inlet and outlet fluid and allow the control to
intervene.
On the combustion circuit of each thermal element are installed:
−
Gas solenoid
in class B+C , with pneumatic gas flow com-
pensation depending on the suction line's air flow rate.
−
Ionisation electrode for detection
.
−
Flue gases temperature probe
.
− The
Minimum pressure switch
is installed on the mani-
fold of the thermal module
9
The triggering of safety devices indicates the malfunction of
a potentially hazardous thermal module. Therefore, con-
tact Technical Assistance Service immediately. After a brief
pause, it is possible to try and restart the appliance (see
Paragraph "Initial startup").
9
Safety devices must be replaced by Technical Assistance Ser-
vice, using only original parts. Refer to the spare parts cata-
logue supplied with the appliance. After making the repair,
check that the appliance is working properly.
0
The appliance must not be put in service, even temporarily,
when tampered safety devices are not in operation or have
been tampered with.
