Grundfos ALPHA1 model B User Manual

English (GB)
15
7.5.3 Pump setting for underfloor heating systems
Fig. 20 Selection of pump setting for system type
Recommended and alternative pump settings according to fig.
20:
* See section 10.1 Guide to performance curves.
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. 21 where CP1 has
been selected. For further information, see section 10.1 Guide to
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.
7.5.4 Pump setting for domestic hot-water systems
Fig. 22 Selection of pump setting for system type
Recommended and alternative pump settings according to fig.
22:
* See section 10.1 Guide to performance curves.
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. 23 where II has been
selected. For further information, see section 10.1 Guide to
performance curves.
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.
TM06 9098 4317
System type
Pump setting
Recommended Alternative
Underfloor
heating
Constant-pressure
curve, CP1, CP2 or
CP3*
Constant curve/constant
speed, I, II or III
TM07 0087 4117
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*
TM05 3068 0912
Q
H
Q
H

Grundfos ALPHA1 model B Specifications

General

Maximum Operating Pressure	10 bar
Supply Voltage	230 V
Enclosure Class	IP42
Insulation Class	F
Pump Type	Circulator
Port-to-port length	180 mm