7 Operation
41 of 68
Calio
1157.821/04-EN
7.2.4 Proportional-pressure control
Application
▪ Heating systems with a radiator
The higher the flow rate, the higher the system’s resistance. This is corrected by the
pump set automatically increasing the head setpoint.
When setting the setpoint ensure that the selected control curve is suitable for the
system characteristic curve:
▪ If the system characteristic curve is known (e.g. hydraulic balancing), select a
control curve that is minimally above the characteristic curve. See type series
booklet.
– Control curve too low: undersupply
– Control curve too high: increased energy input
▪ If the system characteristic curve is unknown, dynamic control is recommended.
(ðSection7.2.5,Page43)
– The pump set automatically recognises the system characteristic curve via the
speed control system and optimises the operating point accordingly.
Function
Within the permissible flow rate range the Proportional-pressure Control decreases
or increases the differential pressure setpoint between
1
/
2
H
S
and H
S
(factory setting).
Fig.21: Proportional-pressure Control function
Setting
Press the control element to activate the display from idle mode. The display will
show the current operating mode as well as, in alternation, the electrical input
power and the flow rate. If 5minutes pass without any settings being made or the
control button being pressed, the display will revert to idle mode.
Table17: Selecting Proportional-pressure Control and the setpoint
Step 1: Activating the setting mode
▪ Press the control element for 3seconds.
– The operating mode which has last been selected will start
flashing.
Step 2: Selecting the Proportional-pressure Control operating mode
▪ Turn the control element and select the required operating
mode.
Step 3: Activating the Proportional-pressure Control operating
mode
▪ Press the control element.
– The number of flashing LED segments shows the setpoint
which has last been set.
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