Unvented pressure release into sink waste pipe - smelly

[wwwebber]

Ok, we had an unvented cylinder fitted last year and every now and then our en suite would fill up with bad smells. We located this to the pipe that comes out of the unvented cylinder which has a tundish on it. The problem here is that this pipe drains into the sink waste. As a result sewer smells are penetrating the room. The smells go away if cap this pipe off but this is not safe of course, however neither is sewer stink !!

Has the plumber cocked up here ? does this pipe need some kind of valve on it ? or does it need to be disconnected from the sink waste and fed directly outside ?

Cheers.

 

[muggles]

You were given the answer to this when you posted about it 2 months ago...

 

[wwwebber]

Incorrect. That thread was about identifying where the smell was coming from. My last post on that thread was "how do I get this fixed" and the thread died right there. So I have created another without all of the guff, focusing on how to resolve it. Care to contribute positively ?

 

[muggles]

The discharge needs to be a dedicated pipe with no other appliances connected into it before it reaches the stack. It must be run in high temperature resistant pipe, via a dry trap such as a HepVo with a tundish adapter on it

 

[bernardgreen]

Item 2 the visible air break is your tundish
Item 3 the 75 mm trap is what would have prevented sewer gas coming out of the tundish had the installer fitted it.

 

[muggles]

View attachment 163961

Item 2 the visible air break is your tundish
Item 3 the 75 mm trap is what would have prevented sewer gas coming out of the tundish had the installer fitted it.

Wrong again Bernie - this is the discharge arrangement for a boiler condensate pipe. The OP is asking about the arrangement for an unvented cylinder discharge, which is very definitely not to be installed in the manner described in your post

 

[wwwebber]

@muggles thank you. I will look into having a go myself as this seems relatively simple. If not I will get the plumber back.

Cheers.

 

[bernardgreen]

Wrong again Bern"

Yes I did get it wrong.

But then so did the ( I assume ) G3 qualified installer

 

[dilalio]

Yes I did get it wrong.

But then so did the ( I assume ) G3 qualified installer

Two wrongs don't make a right!
Yet, to assume makes an ass (out of) u (says) me

 

[dilalio]

@muggles thank you. I will look into having a go myself as this seems relatively simple. If not I will get the plumber back.

Cheers.

Need to be g3 qualified and this all goes in the benchmark.

 

[wwwebber]

Need to be g3 qualified and this all goes in the benchmark.

Fair point. I will get him back.

 

[dilalio]

Fair point. I will get him back.

Is he g3? I'd be surprised if he is, as doing something wrong when you should know better is often worse than doing something you don't know!

Wrong pipe for discharge can cause a lot of problems...

 

[wwwebber]

It said G3 on his card and it was in date. Not good either way.

 

[dilalio]

It said G3 on his card and it was in date. Not good either way.

Before Bernard pipes in (scuze the pun)... No! That is not good either way and I'd ask your fitter why he thought it would be OK to do that!

 

[oilboffin]

Vgood point looks snood to me.Bob