Venting The Pump; Venting The Heating System - Grundfos ALPHA1 15-50 Bedienungsanleitung

5.3 Venting the pump

1
2
Fig. 8 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.
The pump must not run dry.
You cannot vent the system through the pump. See section
5.4 Venting the heating system.
10

5.4 Venting the heating system

10 Min.
Fig. 9
Vent the heating system via a vent valve installed above the
pump (1).
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
Repeat the procedure, if necessary.
1
2
3
Venting of the heating system
7. Control functions.
The pump must not run dry.
10 Min.