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1.6 Operating Modes
1.6.1 Operating in Space Heating Mode
To operate the Space heating mode, press the Space heating
button on the front panel and select a heating temperature
setpoint higher than current heating temperature.
1. When the boiler detects a request for heating production
(from the installation's room thermostat, for example), the
3-way valve goes to heating position and the circulating
pump starts up.
2. If the boiler water temperature is lower than the desired
temperature setpoint, the boiler ignites and heats up the
heating installation until the selected boiler temperature
is reached. The boiler's electronic control modulates
the burner output to adapt to the installation's heat
requirements at all times and so that the installation's water
temperature remains constant. This prevents the installation
from overheating and reduces heat loss as much as possible.
3. When there is no further heating demand (e.g. when
the desired ambient temperature selected on the room
thermostat is reached), the burner is extinguished (if it was
ignited) and the circulation pump continues to run during
the post-circulation time (minimum 3 minutes), to protect
the boiler from overheating due to thermal inertia in the
installation.
Blow Fan
Three
-way
Valve
Gas
Valve
Gas
Inlet
Flow
Out
Exhaust
Gas
Air In
Air In
Ignitor
Heat
Exchanger
Circulation
Piump
DHW Heat
Exchanger
CH
Return
1.6.2 Operating According to Outdoor
Temperature Conditions
When the boiler is connected to an outdoor temperature sensor
(supplied optionally), functioning may be activated according to
the outdoor temperature conditions, using parameter.
When this operating mode is activated, the boiler and/or
heating output temperature are determined in accordance with
the K curve set for parameter and the outdoor temperature
measured. If the installation is correctly dimensioned, the boiler
temperature and/or output temperature calculated will ensure
that the room temperature is in accordance with the set point
programmed.
The K curve relates the outdoor temperature reading on the
sensor installed outside the home to the boiler temperature
setpoint. The graph shows the temperature ratio for each point
on the K curve.
K - factor
6
5
4
85
80
75
70
65
60
55
50
45
40
35
30
25
20
20
15
10
5
Outdoor Temperature (ºC)
To connect the outdoor temperature sensor to the
Note
boiler, carefully follow the connection instructions
provided in the "10.5 Outdoor Temperature Sensor
(Optional)" on page 62.
3
2.5
2
1.5
1
0.9
0.8
0.7
0.6
0.5
0
-5
-10
-15
-20
About the Boiler
17
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