25
Instructions for the user
1.14.6.1 Ambient probe freeze protection function
If the boiler board is OFF, or DHW ONLY, and the ambient probes detect a temperature below 5°C, a heating request to heat the probe-
controlled room is launched.
The heating function ends when the probe ambient temperature reading r6°C.
1.14.6.2 Flow freeze protection function
When the heating water temperature sensor detects a water temperature of +5 °C, the boiler switches on and stays on at its minimum heat
output until the temperature r30 °C or 15 minutes have elapsed.
The pump continues to operate even if the boiler shuts down.
1.14.6.3 Water heater freeze protection function
When water heater temperature sensor detects a water temperature of 5°C, the boiler switches on and stays on at its minimum heating output
until the temperature of the water in the heater reaches 10°C or 15 minutes have elapsed. The pump continues to operate even if the boiler
shuts down.
During the water heater anti-freeze operation the temperature detected by the flow probe is constantly checked, and in case it reaches 60°C
the burner is switched off. The burner is switched on again if the operation request in anti-freeze mode is still present and the flow temperature
is below 60°C.
1.14.7 Anti-seize function
If the boiler remains inactive and connected to the power mains, the circulation pump and the deviating valve will be shortly enabled every
24 hours so as to avoid any shut-down.
The same applies to the relay which can be freely programmed whenever this latter is used to power a recirculation pump or a deviating valve.
1.14.8 Operation with external probe (optional)
Boiler can be connected to a probe measuring the external temperature (optional - not compulsory, supplied by the manufacturer).
Once the external temperature value is known, the boiler will automatically adjust the heating water temperature: increasing it as the
external temperature decreases and decreasing it as the external temperature increases. This will both improve room comfort and reduce fuel
consumption. The maximum temperature is respected all the same.
This boiler operating mode is called "sliding temperature operation".
Heating water temperature varies based on a programme written inside boiler electronic microprocessor.
When working with an external probe, the CH +/- buttons are no longer used to set heating water temperature, but to edit fictitious ambient
temperature, namely the desired theoretical temperature.
During temperature setting, the fictitious ambient temperature
symbol flashes on the display and the value being set is shown.
For optimal curve adjustment, a position close to +20 °C is recommended.
For further details on "cruising temperature operation", refer to paragraph
Installation of the (optional) external probe and sliding temperature
operation
on page
56
.
WARNING
Only original external temperature probes supplied by the manufacturer must be used.
The use of non-original external probes, not supplied by the manufacturer, may affect the operation of the external probe itself
and of the boiler.
