7 Operation
39 of 68
Calio
1157.821/04-EN
7.2 Operating modes
7.2.1 Information about settings
The pump set is fitted with a hydraulic controller for setting the head setpoint, based
on which the pump set's speed is calculated and adjusted. The head setpoint is
determined by the set operating mode and the selected setpoint. The functionality of
the hydraulic controller and its settings via the KSB ServiceTool are described in the
KSB ServiceTool supplementary operating manual.
For common applications such as two-pipe systems Proportional-pressure Control (Δp-
v) is the recommended operating mode. This operating mode offers an extended
control range with additional potential savings compared to Constant-pressure
Control (Δp-c). Depending on the balancing of branch circuits, undersupply may
occur at a consumer installation.
The Constant-pressure Control operating mode (Δp-c) can be selected as an option
(e.g. for underfloor heating systems). If noises are audible at low flow rates, select
the Proportional-pressure Control operating mode (Δp-v).
The setting of the discharge head setpoint depends on the piping curve of the system
and on the heat requirements. As standard the pump sets are set to Proportional-
pressure Control (Δp-v) and medium output (setpoint 50 %).
7.2.2 Temperature-governed differential pressure control
The temperature-governed differential pressure control increases or decreases the
head in a linear fashion with the fluid temperature. The operating mode can be
enabled via the KSB ServiceTool. The functionality of the temperature-governed
differential pressure control and its settings are described in the KSB ServiceTool
supplementary operating manual.
7.2.3 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 characteristic
curve is not changed by thermostatic valves.
Function
In Constant-pressure Control the set head
②
is maintained irrespective of the flow
rate. The set differential pressure 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. 19:
Constant-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 5 minutes pass without any settings being made or the
control button being pressed, the display will revert to idle mode.
