Grundfos ALPHA SOLAR 15-75 130 - Venting the Heating System; Venting the Pump

English (GB)
10
5.3 Venting the pump
Fig. 13 Venting the pump
The pump is self-venting through the system. You do not have to
vent the pump before startup.
Air in the pump may cause noise. This noise ceases when the
pump has run for a few minutes.
You obtain quick venting of the pump by setting the pump to
speed III for a short period. How fast the pump is vented depends
on the system size and design.
When you have vented the pump, i.e. when the noise has
ceased, set the pump according to the recommendations. See
section 7. Control functions.
You cannot vent the system through the pump. See section
5.4 Venting the heating system.
5.4 Venting the heating system
Fig. 14 Venting of the heating system
Vent the heating system as follows:
• via a vent valve installed above the pump (1)
• via a pump housing with air separator (2).
In heating systems that often contain much air, we recommend
that you install pumps with pump housing with air separator, i.e.
ALPHA2 or ALPHA3 XX-XX A.
When the heating system has been filled with liquid, do as
follows:
1. Open the vent valve.
2. Set the pump to speed III.
3. Let the pump run for a short period
4. Set the pump according to the recommendations. See section
7. Control functions.
Repeat the procedure, if necessary.
TM05 3075 0912
The pump must not run dry.
10 Min.
1
2
TM03 8931 2707
The pump must not run dry.
W
40 180
A
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
40
4
4
4
4
40
0
0
4
4
4
4
0
0
4
40
4
4
4
4
40
0
4
4
0
4
4
4
0
18
0
A
A
A
A
10 Min.
2
1
3