Description; Safety Devices - Beretta POWER PLUS Installation Instruction

Description

The POWER PLUS Boiler is a wall-hung condensing
boiler, for heating only, with a premix burner, made up of
one or two heating units, depending on the model.
The POWER PLUS Boiler can be combined in a casca-
ding configuration with other heat generators to create
modular heating plants made up of boilers connected
to the same water circuit and with electronic controllers
communicating via bus. The heat output of each heating
unit reaches 48.50 kW (100%, 50°C-30°C) and can be
modulated from 30% to 100%. The efficiency reaches
108.7% and the low flue gas outlet temperature allows
the use of a flame-retardant polypropylene flue (class
B1), with a diameter of just 50 mm and a total equivalent
height of 30 metres.The versatility of the electronic board
makes quick connection possible to all types of central
heating and domestic hot water production systems with
storage, managing three circuits operating with three
different temperatures at the same time.The individual
heating units in cascading configuration can be acti-
vated, as well as by simple rotation, in such a way that
when a certain percentage of output is reached by the
first unit, the other units start automatically, all with the
same load factor.
This means that total heat output can be provided by a
number of heat exchangers in a way that achieves the
ideal heat output / exchange area ratio for exploiting latent
condensation heat.
Dedicated boiler accessories are also available, inclu-
ding two-way valves and pumps, and combustion air
intake devices. Other accessories include water hea-
6
ders and flue gas headers for cascading installations,
and room controllers (for setting control parameters and
displaying temperatures and system errors).

Safety Devices

The POWER PLUS Boiler is fitted with the following safety devices, installed on each heating unit:
Safety thermostat with automatic reset, activated if the
outlet temperature exceeds 90°C, shutting down the
burner.
Diagnosis in the water circuit, the minimum flow-rate of
the heat exchange fluid in each heating unit is controlled
by a water differential pressure switch and an electronic
safety system, using an outlet probe and a return probe.
The appliance goes into safety mode if there is insuffi-
cient water or circulation.
Flue gas outlet safety device: the flue gas probe,
located at the bottom of the exchanger, sets off an alarm
in the event of high flue gas temperatures (> 80°C). In
addition, the float in the drain trap prevents the flue gas
from passing through the condensate drain.
Fan safety device: a Hall-effect sensor constantly moni-
tors the rotation speed of the fan.
The POWER PLUS Boilers are designed for cascading
connection, which allows the creation of compact and
very flexible heating plants, due to the high degree of
modulation.
The main features of the POWER PLUS Boiler are:
- premix jet burner with constant air-gas ratio
- output from 16.3 to 100 kW (models 100 M and 100 S)
- heat output up to 400 kW, by connecting up to 8
heating units in a cascading configuration, using the
waterconnection kit available separately
- maximum flue gas outlet temperature 80°C
- total flue gas outlet and combustion air intake length up
to 30 m, Ø 50 mm
- quick connection of the water and gas headers (optio-
nal), with outlet on the right or left
- microprocessor control with self-diagnosis, shown on
leds and the display
- the electronic controller can manage up to 60 heating
units in cascading
- frost protection function activated according to the out-
side temperature and/or the temperature of the boiler
- fitted for room thermostat in the high and low tempera-
ture zones
- outside probe to enable the climate control function
- post-circulation function for the central heating and
DHW circuits
- priority settable on the DHW, high or low temperature
circuit
- possibility to manage two circuits with fixed set point or
with climate control using two separate curves
- automatic reversal of the burner ignition order
- emergency function, which in the event of faults on the
Master board still allows the Slave boards to be control-
led.
b
The activation of the safety devices indicates a
potentially dangerous malfunction on the boiler;
immediately contact BERETTA or other professio-
nally qualified personnel.
After a short wait, try restarting the boiler (see chapter
on starting for the first time).
a
The boiler must never be started, even temporarily,
with the safety devices not working or having been
tampered with.
b
The safety devices must be replaced by the only
using the original components supplied by the
manufacturer. See the spare parts catalogue sup-
plied with the boiler.
After having performed the repairs or replacements,
check the correct operation of the boiler.