Beretta Power Plus Box 1002 P INT, Руководство по установке, Страница: 16 / 44

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6 .2 .7 Frost protection
The heating unit electronic control includes a frost protec-
tion function. When the flow temperature sinks to below a
minimum value, the burners start working at minimum pow-
er according to the procedure used to set the functional
parameters.
The frost protection mode is activated even if the external
probe (supplied with the appliance) is not connected to the
boiler: parameters 14 (related to the Ch1 high temperature
system) and 22 (Ch2 low temperature system) are in fact in
default and set in weather function.
Should one not want to connect the probe, the boiler must
be made to work at a fixed point to avoid problems. The
parameter 14 and 22 settings may only be altered by a
Technical Assistance Centre authorized by
B
.
b
Power and fuel gas supply must be activated and the
water system at a correct pressure for the frost pro-
tection system to function.
Glycol can be used as an additive for the system (up to a
maximum of 50%) there where considered necessary by
the person responsible for the project, keeping in mind that
this substantially reduces efficiency as it alters the specific
heat of the fluid.
Furthermore several parts of the system could be dam-
aged by altering the pH.
6 .2 .8 Connection to 0-10v external
thermoregulator
An external thermoregulator connection using a 0 – 10 v
signal could be used by connecting the output signal to
terminals n.13 and 14 (Figure 17).
b
The positive pole of the signal output must be con-
nected to terminal 13 for the device to work correctly.
6 .2 .9 Connection to alarm device
A beeping or visual alarm device, to signal any technical
faults, may be connected outside by a special output with
clean contact on the boiler terminal board.
The alarm device must be connected to terminals n.18 and
19 (Figure 17).
6 .2 .10 Remote control
If the remote control is to be used, it must be connected to
terminals no. 15, 16 and 17 (Figure 17).
6 .3 Emergency mode
The
Power Plus Box P INT-EXT
electronic control system in-
cludes a functional mode called “Emergency”, which can
be activated in case of a Master board malfunction.
The master board can in fact be excluded so as to enable
the system to work with a flow temperature preset in default
by the manufacturer, guaranteeing the heating unit with
continual service.
b
Qualified personnel only may work on the electrical
system and in compliance to provisions of the law,
with particular attention to rules on safety.
The following procedure must be adopted to enable the
“Emergency” function:
- Disconnect the 4-pole J14 connector from the master
board (see Figure 19);
- set all four J17 switches located on each Slave of the
thermal assembly on the Off position (Figure 20);
- Supply power to all the circulators in the system
directly from the mains using the specific relays/
change-over switches;
- Connect terminal X1 or terminal X2 (which are part
of the J14 connector wiring disconnected during the
first step of this procedure) to a 24 V ac power supply
(see Figure 21).
b
If several
Power Plus Box P INT-EXT
are installed in
series, one of the two terminals (X1 or X2) or both
may be connected to the adjacent thermal group or
groups. If this is the case, supply the free terminal
with 24 V, (see par 6.4.2).
Figure 19
Figure 20