Re: Know about plumbing?


"spudnuty" <spudnuty@xxxxxxxxx> wrote in message
news:1132904661.209452.64130@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

>> and there is a 3 bar safety valve in case the tank boils.
> Well that is the job of the TPR valve which usually vents
> out the top of the tank into a drain. These are both
> thermostatic 210ºF and pressure 150 psi (10.32 bar!!)
> all US figures. See:
> http://www.usinspect.com/WaterHeaters/HWaterTPRValve.asp

It's not got a temperature sensitive valve unless hidden inside the tank
enclosure somewhere. It's just got a the 3bar relief valve. Perhaps locals
codes (Belgium) don't require anything more than a regular relief valve.

>This primary would also have a TRP valve and that's good that's good
>there's a valve because as it seems the way your system is hooked up
>there is the chance of backflow from the boiler into the hot water side
>of your system.

I think the only way that could happen is if there was a hole in the heat
exchanger in the tank. Otherwise the primary and secondary are seperate once
the filler is closed..

>So if this valve is closed the inlet pressure regulator is out of
>the circuit?

Yes with the primary fill valve closed the primary loop is sealed. The
regulator continues to feed the secondary side, heat exchanger and onto the
hot taps.

> I think the inlet water pressure of your hot water supply tank
> could be at city pressure unless that exceeds 8.5 bar or so.

Yes it looks like that. I just need to find out the data on the tank to
conform that it's rated for that. There must have been a reason why the
reflief valve installed is only 3 bar.

Meanwhile it's performing a bit better now that I changed the regulator from
a 1/2" 3bar to a 3/4" 3 bar unit. The drop accross it when the taps are
turned on is less.

>I just looked at this indirect system and they also recommend
> the use of a cold water inlet pressure releaf valve set at 150 psi.
>
http://www.johnwoodwaterheaters.com/pdfs/GSW_Indirect_Installation_Manual.pdf
> This would also blow off into a drain.

Thanks for the info.

Colin


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