If the second picture is the right way up the pump is mounted in the wrong orientation. The Alpha 2 pumps are self venting but not if it is mounted with the head upwards. Have a look at the installation guide.
If the second picture is the right way up the pump is mounted in the wrong orientation. The Alpha 2 pumps are self venting but not if it is mounted with the head upwards. Have a look at the installation guide.
Instructions for the earlier Selectric models make clear why it should not be vertical:
Where pumps can only be installed in horizontal pipework, it is
imperative that the pump shaft is horizontal, or slightly higher
at the vent plug end.
The shaft must not fall below the horizontal plane, even by a
few degrees, as this causes premature wear of the top bearing
and shaft. Pumps should not be installed with the shaft in a vertical plane,
as this may lead to dry running of the top bearing, noise and
possible pump failure.
If you can get the supplier to replace something which has been damaged because you did not reading the instructions, good luck.
If the second picture is the right way up the pump is mounted in the wrong orientation. The Alpha 2 pumps are self venting but not if it is mounted with the head upwards. Have a look at the installation guide.
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