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A strange situation ... (Read 12274 times)
rgirling
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Re: A strange situation ...
Reply #41 - Dec 19th, 2015, 2:35pm
 
I was thinking that - it would be a definitive answer, either way!  Smiley
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thescruff
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Re: A strange situation ...
Reply #40 - Dec 19th, 2015, 10:38am
 
I would probably go mad and throw the main switch next time it makes a racket
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rgirling
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Re: A strange situation ...
Reply #39 - Dec 18th, 2015, 11:28pm
 
As I said earlier, the shower has a built-in low-voltage pump that switches on once the water flow reaches a certain volume, so whilst it is possible to run the water (gently) without the pump kicking in, it's not possible for the pump to run without water - anyway, I'd hear it. It has got an isolating switch, so I will isolate it next time the noise kicks in.

The only other pump in the house is the CH pump, mounted in the airing cupboard, as shown in earlier photos. I can hear that clearly when it runs too, but the noise occurs at any time of the day or night when it's not running. I'll switch that off too when I hear the noise again.

Ray
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thescruff
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Re: A strange situation ...
Reply #38 - Dec 18th, 2015, 11:06am
 
Unlikely that it will but we're clutching at straws so anything is worth a try.

Did you isolate the power shower electrically.

My take on it, is still external from the tank so switching anything electric off should stop it eventually.

Expansion tanks can vibrate but yours is for the heating and there shouldn't be a connection.

Sounds like a pump-or motor as your original post and that is where I would concentrate, the noise is too fast and regular to be much else.

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« Last Edit: Dec 18th, 2015, 11:07am by thescruff »  
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rgirling
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Re: A strange situation ...
Reply #37 - Dec 17th, 2015, 8:28pm
 
OK, thanks - more or less what I thought, but how does that cause a vibration?

Ray
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Re: A strange situation ...
Reply #36 - Dec 17th, 2015, 3:38pm
 
The "head pressure thing" is the pressure created by the water in the tank, the head is the distance above the outlet that the top of the water is so lowering the water level in the tank will reduce the head/pressure.
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rgirling
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Re: A strange situation ...
Reply #35 - Dec 17th, 2015, 2:23pm
 
i tried reducing the level in the header tank (see post number 11), so it wouldn't hurt to lower it a bit more, I guess.

Could you expand on "head pressure thing" for me?

Ray
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Re: A strange situation ...
Reply #34 - Dec 17th, 2015, 1:50pm
 
I know this is a long shot but have you tried experimenting with reduced tank head, even completely empty and then adding head an inch or so at a time (use the nearest isolation valve or tie up the ballvalve) and deduce at what height of head the vibration problem occurs. I'm guessing with an empty tank the vibration should not occur and we can possibly narrow it down to a head pressure thing.

There may also be check valves in the shower supplies, maybe try and isolate those too. I have to admit this is a very curious problem, and as Scruff has said, in all his years it's never happened on his watch..   Huh
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rgirling
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Re: A strange situation ...
Reply #33 - Dec 16th, 2015, 5:23pm
 
The shower pump is a low-voltage integral in an Aqualisa Aquastream shower. It shuts off with the flow.

The vessel is a red Zilmet 4 bar - see pictures below (which also show the layout):

...

...

Ray
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Re: A strange situation ...
Reply #32 - Dec 16th, 2015, 9:14am
 
Don't think its the heating pump as it wouldn't stop when you open a tap, still worth checking though, it could be the shower pump not turning off and maybe running dry or static.

What colour is the expansion vessel and approx age ??
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« Last Edit: Dec 16th, 2015, 9:23am by thescruff »  
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rgirling
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Re: A strange situation ...
Reply #31 - Dec 16th, 2015, 12:55am
 
The CH is fully pumped, the shower has its own integral pump and that's it as far as pumps go. The CH pump and MVs are in the airing cupboard. Next time it happens, I'll try switching off the CH system entirely.

Ray
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Re: A strange situation ...
Reply #30 - Dec 15th, 2015, 11:43pm
 
If it goes all night and it is a pump causing it then something is adrift as there wouldn't usually be anything running 24/7. Can you turn off the power to anything to narrow it down, heating circuit/boiler/shower pumps etc?
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rgirling
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Re: A strange situation ...
Reply #29 - Dec 15th, 2015, 11:55am
 
I've taken pictures and posted them, as requested.

Ray
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Re: A strange situation ...
Reply #28 - Dec 14th, 2015, 10:55pm
 
I don't like Microsoft edge anyway.

That sounds like and external pumo type vibration.

Can we go down a floor and post some pics of the cylinder connections not too close the more you can  get in, in one pic the better.

How big is the system,

Is there a secondary circuit on the hot water.

Post as much details as you about the system relvant or not.
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rgirling
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Re: A strange situation ...
Reply #27 - Dec 14th, 2015, 8:47pm
 
I've made a short clip and up-loaded it to www.raygirling.com/loftpics as before. It works OK in Firefox and Opera, but Microsoft Edge and Safari don't like it.

Ray
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rgirling
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Re: A strange situation ...
Reply #26 - Dec 13th, 2015, 5:00pm
 
I'll do my best!
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thescruff
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Re: A strange situation ...
Reply #25 - Dec 13th, 2015, 3:46pm
 
Can you record the noise and post on your blog
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