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7 Operation
7.2.2 Constant-pressure control
Application
▪ Drinking water circulation systems
▪ Underfloor heating systems
▪ Solar pumps
Solar pumps require a high operating pressure to pump sufficient fluid through the
heat exchanger. Proportional-pressure Control is not necessary as the thermostatic
valves do not impact on the characteristic curve.
Function
In Constant-pressure Control the set head ② is maintained irrespective of the flow
rate. The set discharge head setpoint H
curve ① and the permissible flow rate range.
H
H
max
1
2
2
H
S
H
min
Fig. 20: Constant-pressure Control function
Setting
Press the control button 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 5 minutes pass without any settings being made or the control
button being pressed, the display will revert to idle mode.
Table 18: Selecting Constant-pressure Control and the setpoint
Step 1: Activating the setting mode
▪ Press and hold the control button for 3 seconds.
– The operating mode which has last been selected will start
flashing.
Step 2: Selecting the Constant-pressure Control operating mode
▪ Turn the dial and select the required operating mode.
▪ The symbol will light up.
Step 3: Activating the Constant-pressure Control operating mode
▪ Press the control button.
– The number of flashing LED segments shows the setpoint
which has last been set.
CalioTherm Pro
is constant, situated between the maximum
S
Q
43 of 76
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