Antifreeze Function - Cosmo Multi 3 Montage- Und Bedienungsanleitung

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9. HEATING
Chimney sweeper function
The chimney sweeper function can be used for enabling a quick access to measurement condi-
tions without menu operation for the chimney sweeper.
The chimney sweeper function is activated in all heating circuits by default. The chimney sweep-
er mode can be activated by pressing button ➅ for 5 s.
In the chimney sweeper mode, the heating circuit mixer opens, the heating circuit pump and the
backup heating contact are activated. While the chimney sweeper mode is active, the directional
pad is flashing red. Additionally, Chimney sweeper and a countdown of 30 min are indicated
on the display.
When the countdown has elapsed, the chimney sweeper mode is automatically deactivated. If,
during the countdown, button ➅ is again pressed for more than 5 s, the chimney sweeper mode
will stop.

Antifreeze function

The antifreeze function of the heating circuit can be used to temporarily activate an inactive
heating circuit during sudden temperature drop in order to protect it against frost damage.
The temperature at the sensor selected will be monitored. If the temperature falls below the
adjusted antifreeze temperature, the heating circuit will be activated until the antifreeze temper-
ature is exceeded by 2 K, but at least for 30 min.
Heat dump option
This option is used for diverting excess heat to the heating circuit in order to keep the system
temperatures within the operating range. If the temperature at the allocated sensor exceeds the
switch-on temperature, the set flow temperature is controlled to reach the adjusted value. If the
temperature falls below the adjusted switch-off temperature, the heat dump function switches
off.
This option is not available, if a heating circuit mode for cooling or cooling and heating has been
selected.
Cooling
In the Cooling system submenu, the cooling logic can be adjusted.
For the cooling logic, 2 modes are available:
• Linear
• Constant
In the Linear mode, the set flow temperature will be calculated as in the heating system mode
Linear.
The Constant mode aims to keep the set flow temperature at a constant value which can be
adjusted by means of the parameter TFlow.
For activating cooling, 3 modes are available:
• Outdoor
• External switch
• Both
In the Outdoor mode, cooling is activated if the outdoor temperature cooling is exceeded.
In the Ext. switch mode, cooling is activated by means of an external switch.
In the both mode, both switching conditions are valid for cooling.
If the Timer option is activated, a time frame can be adjusted in which the cooling will be active.
Dew point
The Dew point option is used for avoiding condensation. For this function, 3 variants are
available:
• Humidity
• Switch
• Off
When Humidity is selected, the controller calculates the dew point by means of the humidity
sensor.
The minimum flow temperature results from the dew point plus the adjustable correction value.