7 Operation
41 of 62
Calio Pro / Calio Pro Z
1157.820/01-EN
7.2.2 Constant-pressure Control
Application
▪
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
S
is constant, situated between the maximum
curve
①
and the permissible flow rate range.
Q
1
H
min
H
max
2
H
S
2
H
Fig. 18:
Constant-pressure Control function
Setting
H
H
max
H
S
H
min
Q
Fig. 19:
Constant-pressure Control settings
Table 17:
Selecting Constant-pressure Control and the setpoint
co
Step 1: Activating the setting mode
▪
Press and hold the control button (
●
) for 3 seconds.
– The flashing symbol indicates the active operating mode.
Step 2: Selecting the Constant-pressure Control operating mode
▪
Press the control buttons (+) or (-) until the symbol for
Constant-pressure Control flashes.
▪
Press the control button (
●
) to confirm the operating mode.
Step 3: Changing the setpoint
▪
Increase or decrease the flashing discharge head setpoint by
pressing the control buttons (+) or (-) respectively.
▪
Press the control button (
●
) to confirm the setpoint.
– The selected setpoint lights up. It has been saved.
