Beretta Power Plus Box 1001 EXT, Руководство по установке, Страница: 5 / 40

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Figure 1
3 .2 Advantages
- Totally pre-mixed micro-flame jet burner;
- condensing stainless steel exchanger, with efficiency
up to 109% (see Figure 1);
- maximum exhaust flue exit temperature 80°C;
- PPS plastic exhaust flue manifold, self-extinguishing
(see paragraph 4.11);
- modulating electronic primary circulator at low
consumption;
- weather temperature adjustment device supplied;
- hot water and systems control at different
temperatures, with or without function priority;
- automatic summer/winter switch-over;
- minimum flow capacity of thermal carrier fluid
controlled by a differen-tial pressure switch;
- compensator with inner partition for connection to
three systems;
- INAIL safety organs mounted in factory;
- appliance complete and ready to be connected up to
the installation.
3 .3 Safety devices
All the heating unit functions are electrically controlled and
any fault will cause arrest of the heating unit and the gas
valve to automatically close.
The water circulation system includes:
- automatic resetting safety thermostat;
- differential water pressure switch acting as a
flowmeter;
- temperature probe on flow and return controlled
by a certified electronic device to carry out safety
functions with dual-processor technology. The
flow temperature is continually controlled by these
devices as well as the Δ t between flow and return by
acting on the primary circulator modulation;
- modular flow temperature adjustment.
The combustion system includes:
- gas solenoid valve in B+C class with pneumatically
compensated gas flow dependent on air intake flow
capacity (air/gas ratio 1:1);
- ionization electrode for continual flame control;
- exhaust flue duct temperature control.
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
temporarily, where the safety devices have been
mishandled or excluded.
b
Safety devices must be replaced by the authorized
Technical Assistance Centre only, exclusively using
original parts.