7 Operation
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Calio Pro / Calio Pro Z
1157.820/01-EN
7.2.4 Dynamic Control
Application
▪
Heating systems with radiators
Dynamic Control is a more energy-efficient alternative to Proportional-pressure
Control. The piping losses follow a quadratic system characteristic curve. Dynamic
Control makes the pump set follow a quadratic control curve and automatically
recognises the averaged degree of opening of the thermostatic valves.
When the thermostatic valves are closed or strongly throttled, the pump set’s head
reduction exceeds that of the reduction specified by the quadratic control curve. The
thermostatic valves open and maintain the required flow rate.
If the thermostatic valves do not respond further to the decreasing head, the pump
set automatically switches back to the original control curve. This prevents any
undersupply.
Function
H
Q
1
2
3
4
Fig. 22:
Dynamic Control function
1 Excess energy input
3 Control curve
2 Dynamic Control
4 Minimum characteristic curve
The Dynamic Control (2) system detects when the selected control curve (3) is higher
than the minimum characteristic curve
5)
(4). The control system shifts the control
curve downward, and power input is reduced automatically. To ensure sufficient
supply the pump set switches to a higher control curve when the minimum
characteristic curve is reached. The energy input is reduced (1) without any negative
impact on the supply of the building.
The pump set is operated in an optimised way, even if the system characteristic curve
is unknown; the noise at the thermostatic valves is reduced.
▪
If the system characteristic curve is known (e.g. hydraulic balancing):
– Set the setpoint manually. Select a control curve that is minimally above the
characteristic curve. See type series booklet.
– Activating Dynamic Control in addition is recommended. Even if the setpoint
has been set to an optimum, excessive throttling of the thermostatic valves
may occur in certain climatic conditions. Dynamic Control will further
optimise the operating point.
▪
If the system characteristic curve is unknown:
– Use the standard settings and activate Dynamic Control. The pump set
automatically recognises the system characteristic curve via the variable
speed system and optimises the operating point accordingly.
5
Characteristic curve at fully open thermostatic valves
