5
Depending on the model, the heat input (ref. PCI) of every
modular system reaches 110, 135 or 180 kW, and can be
modulated between 10% and 100%.
Efficiency reaches 107.7% (100% ref. PCI, 50°C-30°C) and
the low flue gas temperatures make it possible to use a fully
integrated plastic flue gas manifold.
The combustion system and the flue gas - water heat ex-
change make it possible to reach very high levels of com-
bustion and heat to water transfer efficiency.
The gas/comburent air mixture is formed upstream of the
burner, due to the coupled modulating fan with a large
pressure difference, which intakes air from outside based
on the system's heat demand, as well as the pneumatic
regulator that supplies the quantity of gas required for op-
timal combustion based on the quantity of aspirated air.
The flue gas produced by combustion passes through the
numerous interspaces created by a winding with a bime-
tallic copper/steel corrugated coil that encounters a spe-
cial cylindrical turbulator, which stops the free outflow and
constrains it to come into contact, in counter-current, with
the pipe in which the system return pipe passes.
By installing the individual heating elements in series not
only permits classical ignition rotation but can also be set
up so that when the first element reaches a certain power
percentage, the other subsequent elements will start al-
ready, all with the same load factor.
The modular systems can be cascade connected (up to
4), placing the antivibration couplings between the de-
livery, return and gas manifolds (accessories) and the
polypropylene coupling pipes for the flue gas manifold
and the condensate outlet manifold (supplied).
The flue gas evacuation and condensate outlet mani-
folds can have an outlet to the left or to the right.
Power Plus Box
150
Base module consisting of 3 heat generators for heating
and DHW production systems.
Heat input from
15
to
135 kW
Power Plus Box
200
Base module consisting of 4 heat generators for heating
and DHW production systems.
Heat input from
15
to
180 kW
.
1 4 Safety devices
The
Power Plus Box
modular system is equipped with the
following safety devices, installed on every heating ele-
ment:
Safety thermostat
with automatic reset, which, when tripped
at 90°, shuts off the burner.
Hydraulic circuit diagnostics
the minimum flow rate of the
carrier fluid for every heating element is controlled by a
differential water pressure switch and an electronic safety
system that controls a delivery sensor and a return sensor.
The equipment is protected if there is no water or in the
case of insufficient circulation.
Safety valve
for the heating system pressure, which trips,
draining the system if circuit pressure exceeds the limit (5.4
bar).
Flue gas evacuation safety
the flue gas sensor, located at
the bottom of the exchanger, provokes a fault in the case
of high flue gas temperature (> 80°C). Furthermore, the
"check valve" present in the flue gas exhaust line prevents
the flue gas from passing between heating elements.
Fan safety
the fan speed is always monitored by a Hall-ef-
fect speed indicator device.
The
Power Plus Box
modulating systems are prepared for
cascade-coupling and this makes it possible to implement
compact and extremely flexible central heating plants
thanks to the system's modulating ratio.
b
The tripping of the safety devices indicates a poten-
tially hazardous malfunction of the modular system,
therefore contact Technical Assistance Centre imme-
diately.
Therefore it is possible to restart the system after waiting a
brief period (see the first start-up chapter).