Pumping over when pump stops?

[GasmanxxxR1]

As above, installed new boiler and pump. Grundfos 15-60. When the pump stops water shoots out of the open vent. It is configured correctly, when it first happend I thought the cf could be partially blocked so I renewed it to no avail. Open vent was at least 300mm above the tank. I know it should be higher but it doesnt normally cause this problem

Any Ideas what could be causing it?

 

[tamz]

Take the vent higher.
When the pump stops it causes a bounce in the system

 

[Leo21]

Is the pump over run working correctly? The pump should run on for at least five minutes.

 

[GasmanxxxR1]

Thanks Tamz, now what excuse can I use to go back and see the customer?

 

[GasmanxxxR1]

Yes, its over-running correctly

 

[tamz]

3 speedfit unions and a bit of pipe in your pocket. Tell them you left your new knipex in the loft :smile:

 

[Leo21]

Thanks Tamz, now what excuse can I use to go back and see the customer?

Left your stillsons somewhere, is it here? In your loft perhaps?

 

[Leo21]

3 speedfit unions and a bit of pipe in your pocket. Tell them you left your new knipex in the loft :smile:

Tamz! Speed fit, old school, no.

 

[tamz]

Its a bit harder to hide the blowlamp flux and solder in yer pockets and they will hear you rumping a compression up lol

 

[Leo21]

But on a serious note, rare for me I know. Don't speed fit only seal on positive pressure?

 

[tamz]

**** off lol

 

[Leo21]

**** off lol

Point taken.