COSMOGAS MYDENS, Installation, Use And Maintenance Manual

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21 MYDENS
COSMOGAS
5 - INSTALLATION
5.14.4 - Installing the external temperature
sensor (on request)
Install the external temperature sensor outside the building
in a wall facing NORTH or NORTH-EAST, at a height of 2 to
2.5 metres from the ground. In buildings with several floors, it
must be installed at about half way up the second floor. Do not
install it above windows, doors or ventilation outlets or directly
below balconies or gutters. Do not plaster over the external
temperature sensor. Do not install the sensor on walls without
eaves, i.e. not protected from rain.
Whenever the sensor is installed on a wall that has yet to be
plastered, it must be installed with a suitable thickness or be
removed before plastering.
Proceed as follows to connect the external temperature
sensor cable:
1.- lay a bi-polar electric cable with minimum section of
1.5mm², which goes from the boiler to the external
temperature sensor. The maximum length allowed is 20
metres. For other lengths up to 100 metres, use a shielded
cable with shield earthing.
ATTENTION !!! As the cables are subjected to
very low safety voltage (24Vdc), they must flow in wires
different from the 230 Vac power supplies.
2.- connect the bipolar cable to the “SE” clamps in figure
5.10;
3.- connect the bi-polar cable to the ends of the external
temperature sensor.
Set the boiler to learn of the external temperature sensor as
follows (refer to figure 7.1):
1.- press the and RESET keys simultaneously for 5
seconds and until the symbol appears on the display
to indicate the entry to the “Installer” menu;
2.- press the and keys to scroll the parameters
in the “Installer” menu until the parameter
2003
is
displayed;
3.- press the RESET key to enable the modification of the
parameter (highlighted by the fact that it starts to flash);
4.- press the and keys to modify the value of
the parameter, taking it to the value of
1
or
2
on the type
of climatic adjustment desired (see chapter 7.11);
5.- press the RESET key to confirm the modification of the
parameter (highlighted by the fact that the value of the
parameter starts to flash);
6.- press the RESET key for 2 seconds to go back to normal
display;
The enabling of the external sensor is confirmed by the
appearance of the icon on the display.
Proceed with the steps given in chapter 7.11.3 to set the correct
adjustment values of the supply temperature depending on
the external temperature.