Control Modes - Grundfos ALPHA1 L Instrucciones De Instalación Y Funcionamiento

7.4 Control modes

7.4.1 Radiator heating mode
The radiator heating mode adjusts both flow and pressure to the
actual heat demand. The pump performance follows the selected
performance curve.
H
Fig. 12 Selection of pump setting for system type
Recommended and alternative pump settings according to fig.
12:
System type
Recommended
Two-pipe Radiator heating
system mode
See also section 10.2 Guide to performance
Factory setting: Radiator heating mode.
7.4.2 Fixed proportional-pressure curve
An option to the radiator heating mode is a fixed
proportional-pressure curve. The pump performance follows the
selected performance curve.
7.4.3 Underfloor heating mode
The underfloor heating mode adjusts the flow to the actual heat
demand in the system while at the same time keeping a constant
pressure. The pump performance follows the selected
performance curve.
H
Fig. 13 Selection of pump setting for system type
12
Q
Pump setting
Alternative
Constant curve or constant
speed I, II, III, see section
7.4.4 Constant curve or
constant speed, I, II or III,
and fixed control curve.
See section 7.4.2 Fixed
proportional-pressure
curve
curves.
Q
Recommended and alternative pump settings according to fig.
13:
System type
Recommended
Underfloor
Underfloor heating
heating
mode
system
See also section 10.2 Guide to performance
Factory setting: Radiator heating mode. See section
7.4.1 Radiator heating mode.
7.4.4 Constant curve or constant speed, I, II or III
At constant-curve or constant-speed operation, the pump runs at
a constant curve. The pump performance follows the selected
performance curve, I, II or III. See fig.
selected. For further information, see section
performance curves.
H
Fig. 14 Three constant-curve/constant-speed settings
The selection of the constant-curve or constant-speed setting
depends on the characteristics of the heating system in question.
7.4.5 Pump setting for one-pipe heating systems
Recommended and alternative pump settings:
System type
Recommended
Constant curve or
One-pipe constant speed, I, II or III.
heating See section
system 7.4.4 Constant curve or
constant speed, I, II or III
See also section 10.2 Guide to performance
Factory setting: Radiator heating mode. See section
7.4.1 Radiator heating mode.
Pump setting
Alternative
Constant curve or constant
speed, I, II or III. See
section 7.4.4 Constant
curve or constant speed, I,
II or III
curves.
14 where II has been
10.2 Guide to
Q
Pump setting
Alternative
Underfloor heating
mode. See section
7.4.3 Underfloor
heating mode
curves.