Grundfos ALPHA2 Series - Pump Setting for Underfloor Heating; Pump Setting for Domestic Hot Water

English (GB)
15
7.7.3 Pump setting for underfloor heating systems
Fig. 24 Selection of pump setting for system type
Factory setting: AUTO
ADAPT
.
Recommended and alternative pump settings according to fig.
24:
AUTO
ADAPT
See section 7.7.1 Pump setting for two-pipe heating systems.
Constant-pressure curve, CP1, CP2 or CP3
The constant-pressure control adjusts the flow 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. 25 where CP1 has been
selected. For further information, see section 11.1 Guide to
performance curves.
Fig. 25 Three constant-pressure curves or settings
The selection of the constant-pressure setting depends on the
characteristics of the heating system and the actual heat
demand.
7.7.4 Pump setting for domestic hot-water systems
Fig. 26 Selection of pump setting for system type
Factory setting: AUTO
ADAPT
.
Recommended and alternative pump settings according to fig.
26:
Constant curve/constant speed, I, II or III
At constant-curve/constant-speed operation, the pump runs at a
constant speed, independent of the actual flow demand in the
system. The pump performance follows the selected performance
curve, I, II or III. See fig. 27 where II has been selected. For
further information, see section 11.1 Guide to performance
curves.
Fig. 27 Three constant curve/constant speed settings
The selection of the constant-curve/constant-speed setting
depends on the characteristics of the heating system and the
number of taps likely to be opened at the same time.
7.7.5 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.
TM05 3067 0912
System type
Pump setting
Recommended Alternative
Underfloor
heating
Constant-pressure
curve, CP1, CP2 or
CP3*
Constant curve/constant
speed, I, II or III
* See section 11.1 Guide to performance curves.
TM05 3066 0912
Q
H
Q
H
CP3
CP2
CP1
TM05 3068 0912
System type
Pump setting
Recommended Alternative
Domestic hot
water
Constant curve/constant
speed, I, II or III
Constant-pressure
curve, CP1, CP2 or
CP3*
* See section 11.1 Guide to performance curves.
TM05 3068 0912
Q
H
Q
H