4 Operation, specialist
The heating curve shows the relationship between outdoor temperature and forward flow temperature at a specific
room temperature. It must be adjusted by changing the gradient on the house and heating system. The heating
curves at different gradients are shown in Fig. 72. This diagram only applies for a room temperature of 20 °C. If the
room temperature deviates the curves will shift upward or downward accordingly. If room temperature deviates,
only the level changes, the gradient will remain the same.
Usual values for the gradient:
Underfloor heating: 0.3 - 1.0
Radiator heating: 1.2 - 2.0
Convector heating: 1.5 - 2.0
Well-insulated structures with low-temperature heating elements require small gradients. Poorly-insulated
structures with high-temperature heating elements require large gradients.
Switch off the fast reduction and room influence when you set the heating curve.
Every day the steepness is increased by 0.1 (room is too cold) or lowered (room is too hot) until the target temperature
agrees with the actual temperature. The heating element valves should be open during the adjustment process. The
outdoor temperature should be under 0 °C. Additional heat sources ( chimney) or consumers (ventilation) should not
be used during this period.
Runtime and idle time determine the set speed of the mixer motor when opening and closing. It can be adjusted to
the sluggishness of the temperature measurement on the forward flow sensor. If the mixer motor is fast and the
temperature sensor responds slowly (e.g. contact sensor without insulation) overshooting of the control system can
occur. In this case the mixer will open and close constantly. A uniform temperature is not set on the forward flow.
Overshoot is corrected by reducing the runtime or increasing the idle time. Mixer travel is limited to 50 cycles in one
direction. Consequently the runtime must be at least as great as 1/50th of the time that the mixer requires to move
from the “Closed” position to the “Open” position in continuous operation.
4.1.2 Dependant on outdoor temperature
Outdoor temp. dep.
switch-off:
If this function is switched on, the heating circuit switches to “Off” in heating programs
1 and 2, when the heating limit is exceeded on the outdoor sensor.
Heating limit day: Temperature limit for operation with the day room temperature.
Heating limit night: Temperature limit for operation with the night room temperature.
4.1.3 Legionella protection
Legionella are bacteria. They thrive at temperatures between 25 and 55 °C; they die at temperatures greater than
60 °C. With the legionella protection function the DHWC temperature is heated to 65 °C on a selectable day of the
week.
This function can also be switched off.
Mon, Tues … Sat.,
Sun.:
Once a week the DHWC unit will be heated to 65 °C on the selected day.
Off: The legionella function is switched off.
MA-Easyfire 10.2008_EN.indd 49MA-Easyfire 10.2008_EN.indd 49 30.03.2009 13:30:07 Uhr30.03.2009 13:30:07 Uhr
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