converting gravity h/w syst to 3 port valve pump syst


Postby alistair1 » Fri May 21, 2010 7:47 pm

Can you tell me if it is essential to move the system fill pipe to a position between the boiler output and the pump. At the moment the fill pipe is connected to the return from the indirect cylinder to the boiler. Is the positioning of the feed just a water temperature issue? It would save me a lot of work if the feed could be left where it is.
Many thanks. cammy777 :roll:
alistair1
Posts: 3
Joined: Fri May 21, 2010 7:19 pm

Sponsor

Simply Build It

Postby plumbbob » Sat May 22, 2010 1:42 pm

Proper system design starts with the positioning of the expansion pipe. This pipe has two uses. Firstly it is fitted to the highest point on the system which will allow air to escape when the system is filled. It also is a safety device to allow steam a safe exit should the boiler thermostat fail.

Now the filler pipe should connect to the system very near (within a few inches) to where the expansion connects. This is done to prevent over pumping. Fitting it in the wrong place is a very common error on vented systems.

Have a look at this. http://farm4.static.flickr.com/3276/309 ... 2ac5_m.jpg
Last edited by plumbbob on Mon May 24, 2010 9:33 pm, edited 1 time in total.
plumbbob
Posts: 1853
Joined: Wed May 07, 2008 9:59 pm


Postby hamish72 » Mon May 24, 2010 7:07 pm

Did mine and left it as was for the old system which of course was wrong but worked perfectly the old system was a back boiler (gas ) but when I went the whole hog and fitted a condensing boiler to the open vent system I had to change the position and fitted a bypass valve
hamish72
Posts: 27
Joined: Sun May 25, 2008 5:11 pm


Postby alistair1 » Mon May 24, 2010 7:41 pm

plumbbob wrote:Proper system design starts with the positioning of the expansion pipe. This pipe has two uses. Firstly it is fitted to the highest point on the system which will allow air to escape when the system is filled. It also is a safety device to allow steam a safe exit should the boiler thermostat fail.

Now the filler pipe should connect to the system very near (within a few inches) to where the expansion connects. This is done to prevent over pumping. Fitting it in the wrong place is a very common error on vented systems.

Have a look at this. http://www.flickr.com/photos/33215007@N03/3096856838/


Many thanks for your reply. I looks like I am going to have to move the feed as well as the expansion pipes to the same position on the boiler o/p pipe then. Oh well!!
alistair1
Posts: 3
Joined: Fri May 21, 2010 7:19 pm


Postby alistair1 » Fri May 28, 2010 11:49 am

hamish72 wrote:Did mine and left it as was for the old system which of course was wrong but worked perfectly the old system was a back boiler (gas ) but when I went the whole hog and fitted a condensing boiler to the open vent system I had to change the position and fitted a bypass valve


Thanks for your input"hamish72" but I think I'll have to bite the bullet and do it the correct way just in case.
alistair1
Posts: 3
Joined: Fri May 21, 2010 7:19 pm


Display posts from previous
Sort by
Order by


 


  • Related Topics