noisy pump

[chrisclay]

hi i have a grundfoss pump that is new and i have replaced partially blocked cold feed pipe from header tank to pump i did not replace it all
when the pump runs on speed one it sounds like gentle waves on the beach (sort of swishing sound ) but on speed two it sounds worse and on speed three you can hear it all over the house.
i have tried bleeding the system and pump but the noise continues

any advice would be appreciated

chris

 

[Bambergaspipe]

Maybe you have only partially unblocked the cold feed

 

[clf-gas]

Maybe you have only partially unblocked the cold feed

And the symtoms for this diagnosis are......?

 

[Bambergaspipe]

Maybe you have only partially unblocked the cold feed

And the symtoms for this diagnosis are......?

Not enough water for the pump demand? What say you

 

[chrisclay]

how do you check the supply is adequate the pipe i removed was practically clear at the cut is there away of checking without cutting more out

 

[gas4you]

Where did you replace the pipe? It will be blocked at the T where it joins the rest of the heating system. Was this what you cut out?

 

[chrisclay]

i replaced 3 metres of pipe from the tee that is connected to the air seperater the tee was quite clogged up so this was easily cleaned out but there is a further 4 metres of this pipe mounted horizonatally before it drops vertically through the ceiling into the airing cupboard that houses the pump

thanks chris

 

[Paul Barker]

If you have an AIRJEC I would expect it to be in the airing cupboard near the pump.

In any case the blockage would be where the cold feed meets the circulating system water.

 

[namsag]

It is not unusual for the air seperator to be full of cr#p and restricting the flow a fault that is often missed