38
60T - 280T
COSMOGAS
13 - INSTALLATION - Electrical connections
13.1.4 - Installing the external temperature
probe
Install the external temperature probe outside the building on
a wall facing NORTH or NORTH-EAST at a height from the
ground of between 2 and 2,5 metres. On buildings with several
storeys, install it at about the upper half of the second storey.
Do not install it above windows, doors or air vents, nor directly
underneath balconies or gutters. Do not plaster the external
temperature probe. Do not install the sensor on walls without
overhangs, that is, that are not protected from the rain.
Should the sensor be installed on a wall that still needs to be
plastered, it must be installed with an appropriate spacer or
remove it before plastering.
To connect the external temperature sensor cable, proceed
as follows:
1.- lay a bipolar electrical cable with 1,5 mm
2
minimum cross-
section going from the boiler to the external temperature
sensor. The maximum allowed length is 100 metres; use
a shielded cable with shield grounding;
ATTENTION !!! As the cables are subjected to
extremely low safety voltage (24Vdc), they must run in
different ducts than 230Vac power cables.
2.- connect the bipolar cable to terminals “14” and “15”
shown in figures 13-4 and 13-5;
3.- connect the bipolar cable to the ends of the external
temperature sensor.
Set the boiler to recognise the external temperature sensor
as follows:
4.- access the “installer menu” as described in section 16.15
and set the parameter
2003
=
1
.
The
icon on the display confirms that the external probe
is enabled.
Proceed with the steps in section 16.9.1 to set the correct
supply temperature adjustment values based on the external
temperature.
13.1.2 - Choosing the room thermostat/
time-programmable thermostat
The boiler is equiped to work with any room thermostat or
programmable thermostat that has a contact to connect
to the cables coming from the boiler, with the following
characteristics:
- open/closed (ON/OFF);
- clean (not powered);
- closed when heat is required;
- electrical characteristic of 24Vac, 1A.
13.1.3 - Connecting the room thermostat/
time-programmable thermostat
Install the room thermostat in a part of the room in which
the temperature is as close as possible to the typical
temperature in the house and, in any case, in an area that
is
not
subject to sudden drastic temperature changes, away
from windows or doors that lead directly outdoors (see
figure 13-2).
To connect the room thermostat cable, proceed as follows
(refer to figures 13-4 and 13-5):
1.- use a bipolar cable with 1,5 mm
2
minimum cross-
section than goes from the boiler to the room thermostat/
programmable thermostat. The maximum allowed
length is 100 metres; use a shielded cable with shield
grounding;
2.- disassemble the boiler casing following the specific
instructions in section 17.2;
3.- lay the electrical cable using the cable gland near
contacts “10” and “11”;
4.- use a free cable gland that is not used by other
conductors;
5.- strip the cable;
6.- connect the 2 ends of the cable to terminals “10” and
“11” (see figures 13-4 and 13-5).
ATTENTION !!! As the room thermostat/
programmable thermostat cables are subjected to
extremely low safety voltage (24Vdc), they must run in
different ducts than 230Vac power cables.
Figure 13-2 - Correct room thermostat/controllable thermostat positioning