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Common questions
HMC300 – 6 720 813 192 (2014/10)
8 Common questions
Why do I have to set a set point value for the room
temperature even though the temperature is not
measured?
When you set a set point value for the room temperature you
change the heat curve. This also changes the room
temperature, because the temperature in the heating system
changes.
Why do the radiators get too hot with a high outdoor
temperature?
Even in summer mode radiators can heat up for a short period
in special circumstances, such as when the circulation pump
starts automatically at a certain interval to prevent it "jaming"
(blocking). If the circulation pump should by chance start
immediately after the heating up of hot water the residual heat
that is not used is moved away via the heating circuit and the
radiators.
Why does the heat pump work at night if the heating is
negligible or very little?
There can be different reasons for this. It depends on which
setting your installer has made for temperature reduction.
• Reduced mode: The heat pump works even when the
heating requirement is less to achieve the set room
temperature, even if it is low.
• Outside temperature threshold and Room temperature
threshold: the heating system switches automatically on if
the measured temperature drops below the set value. The
heat pump will then start as well.
• Protection from freezing: The heating mode is also used
to avoid the system freezing if the outdoor temperature
drops.
Why is the extra heat source used when the time program
switches from lowering to heating?
The output of the heat pump is limited. If the required room
temperature suddenly increases then the extra heat source
must also produce heat, even if no extra heat source is needed
when the temperature is the same. This is why the time
program is not a good choice to save energy.
The measured room temperature is higher than the
required room temperature. Why is the heat source
working anyway?
The heat source can heat up hot water.
Your heating system can be set to 2 possible control modes
( chapter 2.2, page 4).
With outdoor temperature controlled adjustment (and with the
effect of the room temperature) the heat source can also work
if the measured room temperature is higher than the set room
temperature. This also serves to heat adjacent rooms, which do
not have their own room unit, sufficiently.
Why does the house heating not switch off even though the
outdoor temperature has reached the threshold
temperature set for disconnection in the summer?
Disconnection for the summer on the basis of the outdoor
temperature takes the thermal inertial of the building and its
mass (equalisation of temperature differences due to the
structure of the building) into consideration. There is therefore
a delay of several hours before disconnection takes place.
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