English (GB)
15
11. Startup
11.1 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 sections
14. Technical data and installation dimensions
11.2 Venting the pump
Fig. 13
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 will cease 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
section
The system cannot be vented through the pump. See section
11.3 Venting of heating systems
11.3 Venting of heating systems
Fig. 14
Venting of heating systems
The heating system can be vented via an air escape valve
installed above the pump. 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 section
.
Repeat the procedure, if necessary.
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13
Caution
The pump must not run dry.
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3
Caution
The pump must not run dry.
