12
Instructions for the user
1.3.4
DHW function
The DHW production function is enabled on the KC model and on the KR/KRB models with external water heater (optional).
DHW production function is enabled in one of the following operating modes: SUMMER or WINTER.
Such function has always priority over CH water supply.
To set the domestic hot water temperature, press DHW +/- buttons.
During temperature setting, the
symbol flashes on the screen and the DHW current temperature setting is displayed.
When the system requests domestic hot water, the display shows the
symbol (blinking) and the current domestic hot water temperature.
The burner ON symbol
shows while the burner is operating.
Model KC
For KC model, DHW temperature may be set within a range from +35 °C to +57 °C.
WARNING
A flow limiter is installed within the boiler, which limits DHW output flow rate.
This limit is set to 13 litres per minute.
Models KR/KRB
On KR/KRB models with external water heater (optional) and water heater temperature probe (optional, supplied by the manufacturer;
included in the standard supply for KRB model), temperature range is between 35 °C and 65 °C.
On KR/KRB models with external water heater (optional) and water heater probe (optional, supplied by the manufacturer), every 15 days
the anti-legionella function will be enabled, consisting in raising the water heater temperature to 65°C for 30 minutes independent of other
settings.
1.3.5
Freeze protection function
This boiler is fitted with a freeze protection system, which works when the following functions are activated: OFF/SUMMER/WINTER/CH ONLY.
DANGER
The freeze protection function only protects the boiler, not the whole heating system.
The central heating system can be effectively protected against icing by using specific anti-freeze products that are suitable for multi-metal
systems.
WARNING
Do not use anti-freeze products for car engines, and check the effectiveness of the product used over time.
In case burner cannot be ignited due to the lack of gas, the freeze protection functions are anyway enabled through the circulation pumps.
1.3.5.1
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.
1.3.5.2
Plate heat exchanger freeze protection (only model KC)
When the DHW temperature sensor detects a water temperature of +5°C, the boiler switches on and stays on at its minimum heat output until
the DHW temperature r10°C or 15 minutes have elapsed (the deviating valve is in the DHW position).
During the DHW freeze protection 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.
The pump continues to operate even if the boiler shuts down.
Summary of Contents for minorca kr
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