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13.1.4 - Installing the external temperature
sensor
Install the external temperature sensor outside the building
on a wall facing NORTH or NORTH-EAST at a height from
the ground of between 2 and 2.5 metres. Do not install it
above windows, doors or air vents, nor directly underneath
balconies or gutters. Do not plaster or clad over the external
temperature sensor.
Should the sensor be installed on a wall that still needs to
be plastered or clad, it must be installed with an appropriate
spacer or removed before work commences.
To connect the external temperature sensor cable, proceed
as follows:
1.- install a two-core cable with 1.5 mm
2
minimum cross-
section from the boiler to the external temperature sensor.
The maximum allowed length is 100 metres; use a shielded
cable with shield grounding;
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different ducts than 230Vac power cables.
2.- connect the two-core cable to terminals “14” and “15”
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3.- connect the two-core 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
temperature sensor 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 equipped 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);
- volt free (not powered);
- closed when heat is required;
- minimum electrical rating of 24Vac, 1A.
13.1.3 - Connecting the room thermostat/
time-programmable thermostat
Install the room thermostat in a part of the building in which
the temperature is as close as possible to the average
temperature and in an area that is
not
subject to sudden
drastic temperature changes, away from windows or doors
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To connect the room thermostat cable, proceed as follows
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1.- use a two-core cable with 1.5 mm
2
minimum cross-
section from the boiler to the room thermostat/
programmable thermostat. The maximum allowed
length is 100 metres; use a shielded cable with shield
grounding;
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instructions in section 17.2;
3.- secure 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
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programmable thermostat cables are subjected to
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different ducts than 230Vac power cables.
Figure 13-2 - Correct room thermostat/controllable thermostat positioning
