Search found 3 matches

by alistair1
Fri May 28, 2010 12:49 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: converting gravity h/w syst to 3 port valve pump syst
Replies: 4
Views: 3319

converting gravity h/w syst to 3 port valve syst

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&quo...
by alistair1
Mon May 24, 2010 8:41 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: converting gravity h/w syst to 3 port valve pump syst
Replies: 4
Views: 3319

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

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. ...
by alistair1
Fri May 21, 2010 8:47 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: converting gravity h/w syst to 3 port valve pump syst
Replies: 4
Views: 3319

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

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...
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