Grundfos ALPHA1 15-50 Bedienungsanleitung Seite 15

7.5.3 Pump setting for underfloor heating systems
H
Fig. 20 Selection of pump setting for system type
Recommended and alternative pump settings according to fig.
20:
System type
Recommended
Constant-pressure
Underfloor
curve, CP1, CP2 or
heating
CP3*
* See section 10.1 Guide to performance
Constant-pressure curve, CP1, CP2 or CP3
The constant-pressure control adjusts the flow rate to the actual
heat demand in the system keeping a constant pressure at the
same time. The pump performance follows the selected
performance curve, CP1, CP2 or CP3. See fig.
been selected. For further information, see section
performance curves.
Fig. 21 Three constant-pressure curves and settings
The selection of the constant-pressure setting depends on the
characteristics of the heating system and the actual heat
demand.
Q
Pump setting
Alternative
Constant curve/constant
speed, I, II or III
curves.
21 where CP1 has
10.1 Guide to
CP3
CP2
CP1
7.5.4 Pump setting for domestic hot-water systems
H
Fig. 22 Selection of pump setting for system type
Recommended and alternative pump settings according to fig.
22:
System type
Recommended
Domestic hot Constant curve/constant
water speed, I, II or III
* See section 10.1 Guide to performance
Constant curve/constant speed, I, II or III
At constant-curve/constant-speed operation, the pump runs at a
constant speed, independently of the actual flow rate demand in
the system. The pump performance follows the selected
performance curve, I, II or III. See fig.
selected. For further information, see section
performance curves.
H
Fig. 23 Three constant curve and constant speed settings
The selection of the constant-curve and constant-speed setting
depends on the characteristics of the heating system and the
number of taps likely to be opened at the same time.
7.5.5 Changing from recommended to alternative pump
setting
Heating systems are relatively slow systems that cannot be set to
the optimum operation within minutes or hours.
If the recommended pump setting does not give the desired
distribution of heat in the rooms of the house, change the pump
setting to the shown alternative.
Q
Pump setting
Alternative
Constant-pressure
curve, CP1, CP2 or
CP3*
curves.
23 where II has been
10.1 Guide to
Q
15