York Geysir User Manual page 13

Supply temperature
You can choose to adjust the heat curve individually at three specified outdoor temperatures:
-5°C, 0°C, +5°C. The supply temperature can be changed by plus/minus 5 degrees.
HEATSTOP
The HEATSTOP function automatically stops all production of heat when the outdoor tempe-
rature is equal to, or higher than, the value entered for heat stop.
When the heat stop function is activated, the circulation pump will be turned off - except
when hot water is being produced. The circulation pump will be "exercised" for 1 minute per
day. The factory set value for activating heat stop is an outdoor temperature of 17°C. If the
heat stop function is active, the outdoor temperature must drop 3°C when setting, before the
heat stop stops.
MIN and MAX
The MIN and MAX values are the lowest, respectively highest set point values that are
allowed for the supply temperature.
Adjusting the minimum and maximum supply temperatures is particularly important if your
home has under floor heating.
If your house has under floor heating and parquet floors, the supply temperature must not
exceed the recommendations of the floor manufacturer. Otherwise there is a risk of dama-
ging the parquet floors. If you have under floor heating and stone tiles, the MIN value should
be 22-25°C, even in summer when no heating is required. Also remember that the value for
HEATSTOP needs adjusting upwards for summer heating. This is to achieve a comfortable
floor temperature.
If your house has a basement, the MIN value should be adjusted to a suitable temperature
for the basement in summer. A condition for maintaining the heat in the basement in the
summer is that all radiators have thermostat valves that switch off the heat in the rest of the
house. It is extremely important that the heating system in the house is trimmed correctly,
see the "Trimming the heating system" section for further information. Also remember that
the value for HEATSTOP needs adjusting upwards for summer heating.
Figure 9: The adjusted curve at -5°C
Local higher supply tem-
perature at -5°
Outdoor temperature
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