13
Instructions for the user
1.3.5.3
Water heater freeze protection function (for models KR/KRB with external water heater).
On KR/KRB models with external water cylinder (optional) with NTC probe (10 kΩ @ ß=3435; refer to water cylinder technical specifications),
the frost protection function also protects the water heater.
When water heater probe detects a water temperature of +5 °C, the boiler switches on and stays on at its minimum heat output until the
temperature of the water heater water r10 °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 r60°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.
1.3.5.4
Ambient probe freeze protection function
If the ambient probe detects 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.
1.3.6
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.
1.3.7
Timed post-circulation function
After each central heating, DHW or freeze protection request, the pump continues to be powered for 30 seconds.
If a new central heating, DHW or freeze protection request is received during this period, the post-circulation function is cancelled in order to
fulfil the request.
1.3.8
Timed post-ventilation function
After each central heating, DHW or freeze protection request, the fan continues to work for 10 seconds.
If a new operating request is received during this period, the post-ventilation function is cancelled in order to fulfil the request.
1.3.9
Operation with ambient probe (optional)
Boiler can be connected to an ambient probe (optional - not compulsory, supplied by the manufacturer).
When the ambient temperature is known, the boiler automatically adjusts the heating water temperature by increasing it when the ambient
temperature decreases and decreasing it when the ambient temperature is close to the set one.
Heating water temperature varies based on a programme written inside boiler electronic microprocessor.
When working with a connected ambient probe, the +/- CH buttons are no longer used to set heating water temperature, but to change the
desired ambient temperature.
During temperature setting, the °C icon and the value being set are shown on the display.
As soon as button is released, icon will continue flashing for approx. 3 seconds, and set value will flash as well.
After this time, value is stored and display standard operation will be restored.
To connect the ambient probe refer to
Installation of the ambient probe (optional)
on page
39
WARNING
Only original ambient probes supplied by the manufacturer must be used.
The use of non-original ambient probes, not supplied by the manufacturer, may affect the operation of the ambient probe itself
and of the boiler.
Summary of Contents for minorca kr
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