Grundfos ALPHA2 User Manual

22
10.3 Venting of heating systems
Fig. 13 Venting of heating systems
The heating system can be vented
• via an air escape valve installed above the pump (1)
• via a pump housing with air separator (2).
In heating systems that often contain much air, Grundfos recommends the
installation of pumps with pump housing with air separator, i.e. ALPHA2
pumps, type ALPHA2 XX-XX A.
When the heating system has been filled with liquid, follow this procedure:
1. Open the air escape valve.
2. Set the pump to speed III.
3. Let the pump run for a short period, depending on system size and
design.
4. When the system has been vented, i.e. when the possible noise has
ceased, set the pump according to the recommendations. See
7. Setting the pump.
Repeat the procedure, if necessary.
TM03 8931 2707
W
5-40 180
A
AUTO
ADAPT
I
II
III
1
23
4
10
11
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