7 Operation
44 of 76
EtaLine Pro
1168.87/01-EN
7.2 Operating modes
7.2.1 Information on settings
For common applications, such as two-pipe radiator heating systems, Dynamic
Control or Proportional-pressure Control (Δp‐v) are the recommended operating
modes. These operating modes offer 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.
Constant-pressure Control operating mode (Δp‐c) can optionally be selected for
underfloor heating systems, for example. 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 set is pre-set to Proportional-
pressure Control (Δp-v) operating mode.
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. 24:
Constant-pressure Control function
Setting
H
H
max
H
S
H
min
Q
Fig. 25:
Constant-pressure Control settings
