Dc Posted November 19, 2005 Share Posted November 19, 2005 Can anyone advise how to cure a soldered joint on our central heating system which drips once every 10 minutes. I have not fired the boiler up yet and have the pressure at 2.0 bar. I have drained the system down 3 times to fix other leaks but missed this one.( bloody idiot!) Has anyone any ideas how to fix it or know of a product here in France that would do the business. Any help gratly appreciated.dc Link to comment Share on other sites More sharing options...
Opel Fruit<P><BR>Opel Fruit, Dept. 53<P> Posted November 19, 2005 Share Posted November 19, 2005 The only way to cure it is to resolder it. Which means draining and ensuring the joint is dryer than dry. Which is not usually practical.Alternatively, cut the offending joint out and use a couple of bicone joints (compression) with a short length of new pipe. Then it doesn't matter if there is a trickle of water.Not sure why the joint is leaking, (or the others now fixed) but you shouldn't have the cold pressure at 2 bar! It is far too high. Depending on your expansion vessel pre-charge, you should have no more than 1.3 bar cold, all bled. Link to comment Share on other sites More sharing options...
Nick Trollope Posted November 19, 2005 Share Posted November 19, 2005 [quote]Can anyone advise how to cure a soldered joint on our central heating system which drips once every 10 minutes. I have not fired the boiler up yet and have the pressure at 2.0 bar. I have drained the ...[/quote]Apart from wrapping those 2-part resin sticks around the joint, I would drain down, disassemble the joint & do it again!Isn't 2 bar rather high for a sealed system? Someone who knows better will probably correct me.... Link to comment Share on other sites More sharing options...
Dave&Olive Posted November 20, 2005 Share Posted November 20, 2005 hi do not think you will ever reseal this joint even if you drain the system ,without separting it cleaning it and re fluxing it .the solder will not suck into a hole unless it is clean and fluxed!!sorry that last line sounds like it come from a shadey moviepressure on sealed systems ,,, my own view min 1/2 bar cold max 3 bar hot . dave Link to comment Share on other sites More sharing options...
Opel Fruit<P><BR>Opel Fruit, Dept. 53<P> Posted November 21, 2005 Share Posted November 21, 2005 Sealed system (cold) pressure is wholly dependant on the expansion vessel pre-charge. Anything else is misleading.0.5 bar is too low for any EV, 3 bar is on the relief limit. If your system is doing this, Dave, you have a major problem! Either your expansion vessel is too small, or it has lost its pre-charge pressure. I strongly suggest you sort it immediately.If you need any guidance, let me know.(The topic is covered in the sticky.) Link to comment Share on other sites More sharing options...
Jonrev Posted November 22, 2005 Share Posted November 22, 2005 A piece of rubber and a hose clip will sort it until you have time to fix it properly. Ive seen leaks in high pressure steam valves repaired like that and have lasted for more than six months. Link to comment Share on other sites More sharing options...
Dave&Olive Posted November 22, 2005 Share Posted November 22, 2005 [quote]Sealed system (cold) pressure is wholly dependant on the expansion vessel pre-charge. Anything else is misleading. 0.5 bar is too low for any EV, 3 bar is on the relief limit. If your system is doing...[/quote] hi if you read what i posted i do not have a problem , i just posted the min and max preasure settings.. dave Link to comment Share on other sites More sharing options...
Opel Fruit<P><BR>Opel Fruit, Dept. 53<P> Posted November 23, 2005 Share Posted November 23, 2005 Which are wrong....the nominal minimum pressure is dependant on the vase d'expansion pre-charge, and is generally 1.2-1.3 bar.the nominal max pressure with the correct vase d'expansion is 2-2.2 bar at 80C flow temp.If anyone has pressures outside these figures, they have a problem. Link to comment Share on other sites More sharing options...
Dave&Olive Posted November 23, 2005 Share Posted November 23, 2005 hi just think old french wood/oil burners with no low preasure sensors in the system !!! they will work away quite happy on no cold preasure in the system as long as they are full off water that is ... dave Link to comment Share on other sites More sharing options...
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