shower pump

[nabby68]

What may be happening is that the resistance to flow of the water going down into the HWC from the CW cistern is more than enough to lower the water level in the vent pipe to the point where air starts to get into the cylinder, and through the flange, to the pump. It takes a few minutes to do it, typically. As a purely temporary measure, if you put eg a speedfit cap on the vent pipe you'll be able to prove it. Under no circumstances leave it there.

An anti-gravity loop is for what it says, to stop circulation by gravity (convection) which could lead to bubbles of air getting into the pipe, but these soon go through the pump, and don't form after a few minutes.

Problems due to the water being too hot start immediately the pump warms up - the hottest water is at the top of the cylinder.

SOFTUS: see above.............. and chill

 

[Balenza]

You still here nabby. Should you not be up in the loft with a stop end.
You could stick a balloon over the vent pipe. It should have some air inside it and will deflate further if a vacuum is being formed indicating what ChrisR has suggested also.

 

[Softus]

SOFTUS: see above.............. and chill

Well done indeed - you caught me napping, or am I catatonic in disbelief that you still haven't done what's been recommended to you?

I dunno. I used to think that I couldn't possibly underestimate how stupid a novice could be, even one who wanted help from an expert. And yet here you are, defying all rhyme and reason. Congratulations.

I'm hereby opening a book on whether or not nabby goes ahead with the stop end test. Evens he doesn't; 2 to 1 he does. Any takers?

 

[nabby68]

Should you not be up in the loft with a stop end

i know where softus would like to put the stop end!

thanks for your helpful approach Balenza to my problem, but before i do the now legendary stop end test, i would appreciate knowing the solution to the problem that this may show

 

[Softus]

Should you not be up in the loft with a stop end

i know where softus would like to put the stop end!

On. The. Vent. Pipe.

 

[Balenza]

nabby68 wrote

i would appreciate knowing the solution to the problem that this may show

It would mean increasing the pipe size between the CSC and the hot water cylinder cold inlet.

Instead of corking the vent have an assistant hold a glass of water over the end of the vent and see if any gets sucked up when the pump operates.

 

[Softus]

It would mean increasing the pipe size between the CSC and the hot water cylinder cold inlet.

Or removing the mouse.

 

[nabby68]

UPDATE:
tried the suggestion of temporarily blanking the vent pipe, and no difference to the problem. i was thinking that because the shower runs fine for 6 mins before the problem occurs, then maybe i should try and lengthen the tube from the flange that is inserted into the HWC.
Has anyone else got anyother ideas? Getting pretty desperate now!

 

[Balenza]

nabby68 wrote

then maybe i should try and lengthen the tube from the flange that is inserted into the HWC

This tube is restrictive and lengthing it will only make matters worse.
Centrifugal pumps dont like restrictions on the suction side.
Diy bodging comes to mind.

Has anyone else got anyother ideas

At this stage you dont need ideas.
The solutions to your problem were given quite a few posts back by various posters.
Listen to them and study the information.

 

[nabby68]

At this stage you dont need ideas.
The solutions to your problem was given quite a few posts back by various posters.
Listen to them and study the information

sorry Balenza, but i seem to have tried all the suggestions that have been suggested, if you can point me to others that i have not tried then i would appreciate that

 

[Balenza]

nabby68 wrote

but i seem to have tried all the suggestions that have been suggested

Have you fitted a no stop essex flange yet and an AGL. ???

Pump manufacturers dont recommend fitting pumps above the hot water outlet from the cylinder.
And with good reason.
If you do , then you must follow their advice if you want trouble free operation and warrantys that are not rendered void due to bodged installations by diyers like yourself.

You have two choices as I see it.
You say the pump runs for 6 minutes and then gives trouble.
Then just limit your time in the shower to no more than 6 minutes.
How long the pump lasts is anyones guess.
Or -
Install the pump as per the manufacturers recommendations.

Its really that simple.

 

[Softus]

Masterfully succinct Balenza.

He/she still won't listen though...

 

[nabby68]

Masterfully succinct Balenza.

He/she still won't listen though

Softus, can you please refrain from your unhelpful sarcastic comments, it doesnt help! As i see it, you have not come up with one helpful solution, yet you insist on sarcasm to try and prove a point that others have made. Are you a plumber??????

Thankyou Balenza, your point has been noted. The reason for me not using the Essex flange and anti-gravity loop was that the Essex flange is a lot more difficult to fit than the Surrey flange and the space in my airing cupboard is very limited for an AGL. I guess i might have to bite the bullet and get a plumber in, (not Softus) but i do appreciate all your help.

 

[Softus]

He/she still won't listen though

And I was right, as per your reply to Balenza (below).

Softus, can you please refrain from your unhelpful sarcastic comments, it doesnt help! As i see it, you have not come up with one helpful solution, yet you insist on sarcasm to try and prove a point that others have made. Are you a plumber?

Whether or not I've been sarcastic is moot, and whether or not I'm a plumber is irrelevant. If you don't like my posts, then don't read them.

Thankyou Balenza, your point has been noted. The reason for me not using the Essex flange and anti-gravity loop was that the Essex flange is a lot more difficult to fit than the Surrey flange...

That's a poor reason, because an Essex flange is easier to fit than a Warix, which in turn is easier to fit than a Surrey.

...and the space in my airing cupboard is very limited for an AGL.

If your cupboard isn't compatible with fitting a pump, then don't fit a pump. You can't make a silk purse out a sow's ear.

I guess i might have to bite the bullet and get a plumber in, (not Softus) but i do appreciate all your help.

I hereby present the other cheek - do your worst.

 

[nabby68]

Whether or not I've been sarcastic is moot, and whether or not I'm a plumber is irrelevant. If you don't like my posts, then don't read them.

i think that you will find that the purpose of this forum is to give helpful advice and not to give sarcastic comments! and i would of thought that if you are replying to posts in a PLUMBERS forum the it might help if you had some knowledge of the particular profession!

That's a poor reason, because an Essex flange is easier to fit than a Warix, which in turn is easier to fit than a Surrey.

so how many essex flanges have you fitted????

If your cupboard isn't compatible with fitting a pump, then don't fit a pump. You can't make a silk purse out a sow's ear.

please read my posts properly before you decide to comment. i did state that the pump was fitted in the loft space!

I hereby present the other cheek - do your worst

no need, your doing a good enough job yourself!
like i said, if your comments are not constuctive then please either keep them for yourself or go and take them out on some other poor unfortunate soul in another forum!