Control modes, user interface and settings
15
Medium UPM
6
Advantages of AUTO
ADAPT
• Easy installation
• Automatic setting
• Demand-controlled operations
• Optimum comfort
• Energy savings
• Reduced CO
2
emissions.
Constant pressure at all load conditions is essential for
how well the thermostatic valves can control the heat
emission from the radiators. It is a well-known fact that
optimum pump control in a two-pipe heating system
with thermostatic radiator valves is best obtained by
controlling pump pressure on a proportional pressure
curve. In systems as underfloor heating or one-pipe
systems it might be better to use Constant Pressure
control. However, predicting the best position in real-
life applications is rather difficult, because the optimum
position depends on correlated factors such as the
size of the heating system, the boiler type, the load
condition, etc. This is where AUTO
ADAPT
steps in to
ensure that the pump is controlled in an optimum
manner.
The AUTO
ADAPT
algorithm
The objective of the AUTO
ADAPT
algorithm is to
measure and analyse the heating system during
operation and adapt to the current heating pattern. The
system adapts to night vs. day operations, summer vs.
winter season, and heat losses or gains affecting room
temperature, for example, from radiators, walls and
windows, sun radiation, electrical equipment, and
people.
AUTO
ADAPT
three-step task
Fig. 13 The AUTO
ADAPT
three-step task
Basically, AUTO
ADAPT
optimises the position of the
proportional or constant pressure curve via a three-
step task.
The "system analyser" analyses the heating system of
which the pump is a part. On the basis of the analysis,
AUTO
ADAPT
verifies whether the pump pressure is too
high or too low or correct. The "curve selector" uses
this knowledge to select the optimum proportional-
pressure or constant-pressure curve for the pump. The
pump is controlled according to the selected
proportional-pressure or constant-pressure curve by
means of the "Proportional Pressure or Constant
Pressure control". The pump continues this cycle as
long as it is running.
Example
This example shows proportional pressure
AUTO
ADAPT
.
Note: The Constant Pressure AUTO
ADAPT
function
acts accordingly just by utilising Constant Pressure
control, and not Proportional Pressure control as
shown in the example below.
The AUTO
ADAPT
function can operate and adjust pump
speed according to duty point within a specific area.
Fig. 14 Proportional pressure AUTO
ADAPT
operation area
As default the AUTO
ADAPT
is preset to operate the
pump on the middle proportional pressure curve. By
use of an immediate acting PI-controlling function the
pump will adapt to the system on this proportional
pressure curve.
Note: The PI controller is set to eliminate any offset
within a time frame of 120 seconds.
Fig. 15 Proportional pressure control
TM06 0786 0914
Proportional or constant
pressure control
System
analyser
Curve selector
TM06 0848 1014TM06 0851 1014
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