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Buderus Logamatic 4322 Manual

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What you should know about your heating system
2
Logamatic 4321/4322 - Subject to technical modifications.
8
Weather-compensated control
With weather-compensated control, only the outside
temperature captured by the outside temperature
sensor is decisive for the flow temperature level.
Room temperature fluctuations through solar radiant
energy, occupants, open fireplaces or similar external
heat sources are then ignored.
If you utilise this type of control, adjust the thermostatic
radiator valves so that the required room temperature is
achieved in the different rooms.
Room temperature-dependent control
Another possible heating control method is room
temperature-dependent control. The control unit
calculates the flow temperature based on the set and
actual room temperature.
To be able to utilise room temperature-dependent
control, you need a room that is representative of your
whole home. All factors influencing the temperature in
this "reference room" – where the programming unit is
located – will also apply to all other rooms. Not every
home has a room that meets these requirements.
Pure room temperature-dependent control has,
in such cases, certain limitations.
Should you, for example, open a window in the room
where the room temperature is measured, the control
unit will "think" that you have opened the windows
in every room in your house and will begin to heat
vigorously.
Or the reverse might apply: You measure the
temperature in a south-facing room with different heat
sources (solar or other heat sources, e.g. an open
fireplace). Now the control unit "thinks" that it is as hot
in every room as in the reference room; consequently
the boiler output will be severely reduced so that, for
example, the north-facing rooms will become too cold.
With this kind of control you will need to keep all
thermostatic radiator valves in the reference room
fully open.
Weather-compensated control with room
temperature hook-up
Weather-compensated control with room temperature
hook-up combines the advantages of the other two
control modes. The required flow temperature, which
is mainly subject to the outside temperature, can be
adjusted by the room temperature only to a limited
degree. This achieves improved maintenance of
the room temperature within the room containing
the programming unit, without fully ignoring the other
rooms.
With this kind of control you will also need to keep
all radiator valves in the reference room fully open.
Why do the thermostatic radiator valves have
to stay fully open?
If, for example, you want to reduce the room
temperature in the reference room, and you therefore
close the valve, the flow rate through the radiator is
reduced and, therefore, less heat is transferred to the
room. This reduces the room temperature. The control
unit will endeavour to counteract the drop in room
temperature by raising the flow temperature. However,
raising the flow temperature does not raise the room
temperature, as the thermostatic valve continues to
limit the room temperature.
An excessive flow temperature results in unnecessary
heat losses in boiler and pipework. At the same time,
the temperature in all rooms without thermostatic
valves increases due to the higher boiler water
temperature.
… 8 …


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