Fondital GIAVA KRB 12, Руководство по установке, использованию и техническому обслуживанию, Страница: 22 / 68

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1.14.4.1. Ambient probe freeze protection function
If the boiler board is OFF, or WINTER, 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 reaches 6°C.
1.14.4.2. 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 reaches 30°C or 15 minutes have elapsed.
The pump continues to operate even if the boiler shuts down.
1.14.4.3. Water heater freeze protection function
The water heater probe is used to measure water heater temperature and, when this latter is below 5°C, an operation request in water heater
antifreeze mode is launched: the circulation pump will thus be started and the burner ignited.
The anti-freeze function also protects the water heater. 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.
1.14.5. Pump and valve anti-shutdown 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.
On models with high- and low-temperature outlet (V, Z versions, only) the high- and low-temperature zone pumps and the mixing valve are equipped
with an anti-shutdown function. In particular, the pumps are enabled for 10 seconds and the valve carries out a complete cycle after 24 hours of inactivity.
1.14.6. 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. Standard
and reduced range max. temperature values will nevertheless be respected.
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 + and -” buttons (B, fig. 1) are no longer used to set CH water temperature but to edit
calculated ambient temperature, namely the desired theoretical temperature.
During temperature setting, the calculated ambient temperature symbol flashes on the display (19, fig. 1) and the value being set is shown.
For curve optimal setting, a position close to 20° C is recommended. For further details on sliding temperature, refer to paragraph 3.2.13.
Only original external temperature probes supplied by the manufacturer must be used. The use of non-original external
temperature probes, with technical specifications differing from those required by the managing electronics, may affect boiler
and external probe operation.
1.14.7. Operation with (optional) remote control
Boiler interface includes all the possible functions of a Fondital Remote Control, and can control up to two heating zones. User can also connect the
boiler to a Remote Control (optional - not compulsory, supplied by the manufacturer) so as to manage several boiler parameters, such as:
- boiler status selection;
- ambient temperature selection;
- CH water temperature selection;
- DHW temperature selection;
- CH activation time programming and water heater temperature lack of variations;
- boiler diagnostics display;
- boiler reset;
and others.
For instructions on how to connect the Remote Control, refer to
par. 3.2.12 and to its own instruction booklet.
Only original remote controls supplied by the manufacturer must be used.
The use of non-original remote controls, not supplied by the manufacturer, may affect Remote Control and boiler operation.