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Buderus Logamatic 4122 Manual

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What you should know about your heating system
2
Logamatic 4121, 4122 and 4126 - 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 radiant energy from
the sun, 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
A further 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 always 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 completely ignoring the
other rooms.
With this kind of control you will also need to keep all
thermostatic radiator valves in the reference room fully
open.
Why do the thermostatic 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 thermostatic valve further, 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 from 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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