16
ELECTRICAL SYSTEM
6.2.7
Frost protection
The heating unit electronic control includes a frost protection
function. When the flow temperature sinks to below a mini-
mum value, the burners start working at minimum power ac-
cording 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: pa-
rameters 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
Service authorized by
R
.
9
Power and fuel gas supply must be activated and the water
system at a correct pressure for the frost protection system
to function.
Glycol can be used as an additive for the system (up to a maxi-
mum of 50%) there where considered necessary by the person
responsible for the project, keeping in mind that this substan-
tially reduces efficiency as it alters the specific heat of the fluid.
Furthermore several parts of the system could be damaged 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).
9
The positive pole of the signal output must be connected 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 con-
tact 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 ter-
minals no. 15, 16 and 17 (Figure 17).
6.3
Emergency mode
The
Condexa Pro3 IN-EXT
electronic control system includes 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.
9
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 “Emer-
gency” 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 ther-
mal assembly on the Off position (Figure 20);
− Supply power to all the circulators in the system direct-
ly 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).
9
If several
Condexa Pro3 IN-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
Summary of Contents for Condexa Pro3 230 IN V02
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