Grundfos ALPHA2 User Manual

21
10. Start-up
Contents:
10.1 Before start-up
10.2 Venting the pump
10.3 Venting of heating systems.
10.1 Before start-up
Do not start the pump until the system has been filled with liquid and
vented. The required minimum inlet pressure must be available at the
pump inlet. See 3. Applications and 13. Technical data and installation
dimensions.
10.2 Venting the pump
Fig. 12 Venting the pump
The pump is self-venting. It need not be vented before start-up.
Air in the pump may cause noise. This noise ceases after a few minutes
running.
Quick venting of the pump can be obtained by setting the pump to speed
III for a short period, depending on system size and design.
When the pump has been vented, i.e. when the noise has ceased, set the
pump according to the recommendations. See 7. Setting the pump.
The system cannot be vented through the pump. See 10.3 Venting of
heating systems.
TM03 8930 2707
Caution
The pump must not run dry.

Grundfos ALPHA2 Specifications

General

Max Head	8 m
Voltage	230 V
Frequency	50/60 Hz
Type	Circulator Pump
Max. operating pressure	10 bar
Series	ALPHA2
Connection Type	Threaded
Protection Class	IP42
Liquid Temperature Range	2°C to 110°C
Energy Efficiency Index	≤ 0.23
Connection size	G 1 1/2
EEI	≤ 0.23