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15
MULTI-FUNCTIONAL RELAY (P.20)
BioClass HC
is equipped with an auxiliary relay output that may be used to select a series of additional
functions that increase the boiler performance, features and comfort of the installation.
Several operating modes may be set at
P.20
parameter of the
“Technical Menu”
to define the
"multi-
functional relay"
function. The default value of this parameter is 0 (disabled). The following sections
describe the functions that could be set.
15.1
Boiler alarms external signal (P.20 = 1)
When this function is selected (
P.20 = 1
) if the boiler shows an error or an operating alarm code the
multi-functional relay output will be activated, supplying voltage (230 V~) between terminals no.
4
:
"
NO
" and
N
of the terminal strip
J3
, where any external alarm signalling device may be connected
to warn of boiler malfunctioning.
When the boiler lockage is reset, the multi-functional relay output will supply voltage again (230
V~) between terminals no.
3
: "
NC
" and
N
of the terminal strip
J3
.
15.2
Automatic water filling function (P.20 = 3)
BioClass HC
boiler may be connected to an automatic water filling system which can be activated
or deactivated by
P.20
parameter.
It will be required to install a motorised valve to filling the water between the distribution water
and the primary circuit of the boiler. This valve has to be connected in the multi-functional relay
output between the terminals No
4
(
NO
) and
N
of the terminal strip
J3
(see
”Connections diagram”)
.
The hydraulic installation and electrical connection of the automatic water filling system must be
made by qualified personnel.
If the function is enabled (
P.20 = 3
) the electronic controller of the boiler will active the multi-
functional relay output supplying voltage (230 V~) between the terminals No
4
(
NO
) and
N
of the
terminal strip
J3
(see
”Connections diagram”)
that activates the connected filling valve to refill the
primary circuit up to the pressure set at
P.21
parameter. If the boiler pressure drops below the
minimum pressure set at
P.19
parameter the boiler will automatically fill up again until the filling
pressure value is reached.
