About the Boiler 17
Air In
Air In
Exhaust
Gas
Blow Fan
Ignitor
Gas
Valve
Gas
Inlet
Flow
Out
CH
Return
Three
-way
Valve
DHW Heat
Exchanger
Circulation
Pump
Heat
Exchanger
2.6.2 Operating According to Outdoor
Temperature Conditions
The Outdoor Reset Control feature may be used to enhance
energy efficiency while maintaining optimal heating
performance. With the Outdoor Reset Control, the central
heating temperature setting automatically changes according to
the outdoor temperature and the K-Factor setting.
You can configure the Outdoor Reset Control settings on the
front panel in the Central Htg Operation menu. Refer to “10.6.2
Setting the Central Heating Operation” on page 65.
Note
The Outdoor Reset Control feature requires
installation of an outdoor temperature sensor, and it
only works when the boiler is running in the normal
operation mode. It does not work when the boiler’s
front panel displays a fault.
2.6 Operating Modes
2.6.1 Operating in Central Heating Mode
To operate the central heating mode:
1. Press the Menu button (
) to access the Main menu and
select “2. Central Htg Operation” by pressing the OK button
(
).
2. In the Central Htg Operation menu, select “1. Central Htg
ON/OFF” and select “Enable”. Then, select “1-1 CH Set Temp”
and select a heating temperature setpoint higher than
current heating temperature.
●
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.
●
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.
●
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.
