8
5
ON
1
OFF
48
60
25
48
60
8 seconds
Operating cycles
Domestic cycle
This cycle always takes priority over the heating cycle.
When DHW cycle activation is requested, due to DHW tapping by
the user (detected by the domestic water flow meter), the regulator
modulates the valve opening in order to adjust the temperature
detected by the domestic water probe to the selected set point
value.
When tapping ends, the modulating valve is fully closed.
The active domestic hot water cycle is signalled by yellow DHW
LED steady on.
The general domestic water cycle temperature set point can be set
using trimmer P1 and shown on the display.
Heating cycle
Set point regulation
When heating cycle activation is requested by the room thermostat,
the circulation pump is powered while the modulating valve is
opened gradually until the set point temperature is reached.
At the end of the heating cycle, the circulation pump comes to a
stop and the modulating valve is closed. The active heating cycle is
signalled by lighting of the yellow CH LED.
The heating cycle temperature set point can be set using trimmer P2
and shown on the display.
Floor slab heating function
LOW temperature setting
Facilitates the installation of underfloor heating systems at low
temperatures. This function can only be activated and executed if
there are no faults.
It can be activated by pressing and holding the RESET button for 8
seconds.
The yellow CH LED blinks while the floor slab heating function is in
operation.
The function lasts 240 hours and is carried out by simulating a
request to run in heating mode starting from a set point of 25°C and
rising in regular intervals to a temperature of 45°C. Once the
maximum set point has been reached, the function is executed,
following the same procedures, in reverse (from the maximum set
point to the minimum set point).
This function has priority over heating and hot water cycles, and
can be suspended at any time by pressing and holding the RESET
button for 8 seconds.
Optional functions
(to activate/deactivate the optional functions
the electric power supply must always be turned off!)
Domestic cycle
DHW pre-heating function
The function is enabled by setting DIP switch 5 to the ON position.
During periods when the domestic water cycle is not used, if the
DHW probe detects a temperature 10°C below the SET value, the
controller partially opens the domestic hot water modulating valve for
the time required (max. 5 min.) to bring the exchanger to the
condition wherein it can assure rapid DHW production.
The domestic hot water pre-heating function is signalled by the
flashing yellow DHW LED.
This function is less of a priority than any domestic water or heating
cycles.
Heating cycle
Modulating temperature regulation with compensated set
point
The function is enabled by setting DIP switch 1 to the OFF position.
When the function is enabled, the flow temperature is modified
according to the temperature detected by the compensation probe
(located on the user return pipe). This keeps the actual thermal
output of the slab - and therefore the ambient thermal load - under
control. The thermal response time of the system is thus minimised.
If the function is enabled the display shows the return temperature,
and the flow temperature is adjusted in accordance with the
following formula:
Flow temperature = Return tempe
D
T
In
MEDIUM/HIGH
temperature configuration:
D
T = 8–22°C
At
LOW
temperature setting:
D
T = 2–8°C
