5
3 .2 Advantages
- Totally pre-mixed micro-flame jet burner;
- condensing stainless steel exchanger, with efficiency
up to 109% (see Figure 1);
- power from 23 to 115 kW ;
- possibility to manage 32 thermal units (burners) in se-
ries for a maximum power of 3680 kW;
- maximum exhaust flue exit temperature 80°C;
- plastic flue manifold in PP self-extinguishing (see par
4.8):
- water manifold, condensate and smoke manifold in-
side the boiler;
- quick connection of both water, condensate and flue
manifolds (with exit on the right and left side);
- weather temperature adjustment device supplied;
- modulating and modular regulation of the single ther-
mal elements power;
- automatic changeover (at adjustable time intervals)
of the burners ignition order;
- choice of the cascade insertion criteria of the burner
(power %);
- hot water and systems control at different tempera-
tures, with or without function priority;
- automatic summer/winter switch-over;
- anti-legionella mode (only available with remote con-
trol);
- hour and week programming schedule (only availa-
ble with remote control);
- minimum flow capacity of thermal carrier fluid con-
trolled by a differen-tial pressure switch;
3 .3 Safety devices
All the functions of the thermal module are electrically con-
trolled. Any anomaly causes the lock out of the single ther-
mal element and the automatic shut down of the gas valve.
The water circulation system includes:
- auto reset safety thermostat for each thermal ele-
ment;
- safety water differential pressure switch for each ther-
mal element;
- temperature probe on each thermal element flow and
return. Probes are managed by an electronics ho-
mologated for safety performances and with a double
processor technology. Such device allows to continu-
ally control both flow temperature and the
Δ
t between
flow and return of the battery element;
- modulating flow temperature regulation for both sin-
gle elements and the whole battery.
The combustion system includes:
- gas electro valve in B+C class for each thermal ele-
ment, with gas flux pneumatic compensation accord-
ing to the inlet air flow ( air/gas 1:1 ratio);
- ionization electrode for continual flame control;
- flue pipes temperature control for each thermal ele-
ment.
Protective actions and therefore closure of gas valves on
each heating unit are activated in the following cases:
- flame burnt out;
- over-temperature in exchanger system;
- high temperature of exhaust fumes;
- reduced air flow.
a
The appliance must not be started up, even tempo-
rarily, where the safety devices have been mishan-
dled or excluded.
b
Safety devices must be replaced by the authorized
Technical Assistance Centre only, exclusively using
original parts.
3 .4 Components
Power Plus Box P INT-EXT
is made up of a series of Thermal
Units installed in battery placed inside a metal casing.
Each thermal unit is connected to the system in parallel
position as compared to the others, through a flow, return,
gas, flue manifold and condensate discharge manifold.
According to the heat demand, the regulation system
switches on and regulates the single thermal units in order
to guarantee an optimal balance between power required
by the system and power supplied by the boiler (see Figure
1).
Each
Power Plus Box P INT-EXT
can be serially matched
up with other similar boilers, even with different power, in
order to make modular heating thermal plants made up
of several “casings” which shall be hydraulic connected
and controlled by a single modular boiler integrated inside
each single unit.
This regulation system has many advantages: maximum
exploitation of the condensation technology, excellent
modularity of each single boiler and of the whole the bat-
tery ones, ratio of the system modulation equal to 1:157 in
order to cover any power range from 23 to 3680 kW.
All these features contribute to maximize the economy
of the condensing boiler and to allow an excellent sys-
tem-boiler matching.
The ignition order of each single burner is fully managed
by a microprocessor logic device which ensures an equal
number of working hours to each thermal unit.
Summary of Contents for Power Plus Box 1002 P INT
Page 1: ...Installation Manual CONDENSING Power Plus Box 1002 1003 1004 P INT EXT Installation Manual EN...
Page 36: ...36 12 WIRING DIAGRAMS...
Page 37: ...37 Valvola 2 vie Circolatore...
Page 42: ...42...
Page 43: ...43...
