English (GB)
6
4. Applications
4.1 System types
Fig. 3
Pumped liquids and operating conditions
GRUNDFOS ALPHA2 is suitable for
• systems with constant or variable flows where it is desirable to
optimise the setting of the pump duty point.
• systems with variable flow-pipe temperature
• systems where night setback is desired.
4.2 Pumped liquids
Clean, thin, non-aggressive and non-explosive liquids, not
containing solid particles, fibres or mineral oil. See fig. 3.
In heating systems, the water should meet the requirements of
accepted standards on water quality in heating systems, for
example the German standard VDI 2035.
In domestic hot-water systems, it is advisable to use GRUNDFOS
ALPHA2 pumps only for water with a degree of hardness lower
than approx. 14 °dH. For water with a higher degree of hardness,
we recommend a direct-coupled TPE pump.
4.3 System pressure
Maximum 1.0 MPa (10 bar). See fig. 3.
4.4 Relative air humidity (RH)
Maximum 95 %. See fig. 3.
4.5 Enclosure class
IP42. See fig. 3.
4.6 Inlet pressure
Minimum inlet pressure in relation to liquid temperature.
See fig. 3.
TM
05
85
68
24
13
Warning
The pump must not be used for the transfer of
flammable liquids such as diesel oil, petrol and
similar liquids.
Liquid
temperature
Minimum inlet pressure
[MPa]
[bar]
≤
75 °C
0.005
0.05
90 °C
0.028
0.28
110 °C
0.108
1.08
