skodaman
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| posted on 7/11/07 at 07:06 PM |
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Any central heating experts out there?
Having recently bought a new garage with house I've got problems with the heating. The pressure gauge on the boiler reads about 2.5 bar ie. in
the red and steam/ water comes out of the boiler overflow when the heating is on.
Any suggestions as to what the problem is. Boiler is a Vaillant and was afaik new when we moved in.
Skodaman
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JoelP
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| posted on 7/11/07 at 07:11 PM |
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2.5 bar shouldnt be enough to break it, i had one start to leak at 3.5 bar. Are you sure the overflow isnt the condensor pipe? If you want to let the
pressure out to about 1bar, start by bleeding the rads, beyond that, without taking the cover off to let pressure out properly, you may be best off
loosening the filling loop a touch til it drops.
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NeilP
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| posted on 7/11/07 at 07:14 PM |
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Sounds like a stuck relief valve - They get clagged up with fur - If you can find a friendly local plumber then you should be sorted for the price of
the part plus and hour's labour...
If you pay peanuts...
Mentale, yar? Yar, mentale!
Drive it like you stole it!
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Hasse
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| posted on 7/11/07 at 07:15 PM |
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Knowing nothing about UK-type of heaters I would say it sounds like your thermostat is not cutting off. I would guess you have a possibility to set
what water temperature you would like to have in the boiler, often set to about 70°C.
Might of cause be different to our Swedish type systems?
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coozer
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| posted on 7/11/07 at 07:16 PM |
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Mine sits cold at 1.5 bar and goes up to 2~2.5 when hot.
Installing the system we left it open to the main by mistake overnight and came back the next day to 4 bar!
There were no leaks or venting
1972 V8 Jago
1980 Z750
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MkIndy7
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| posted on 7/11/07 at 07:38 PM |
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Being a Valiant its probably got a filling loop for putting water pressure into the boiler, Make sure this is shut! as it sounds like its been left
open.
Reduce the pressure to around 1-1.5bar and then try again and see if it raises and blows off the safety valve, or rises above 2bar.
If it does then its likely to be the Exansion vessel that either needs recharging or replacing.
Or possibly the safely valve that is now damaged, but only if its blowing off at around or below 2bar.. any higher and its only doing its job.
Have a fiddle with the suggested things and get back to us, am sure we'll sort it.
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skodaman
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| posted on 7/11/07 at 09:18 PM |
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Thanx for that guys. It transpires that my locost build sponsor aka the wife has turned the tap to the boiler off and turned the heating on with no
problems.
The pressure remains constant at 2.5 bar so it would appear that bleeding the radiators to let some of the pressure out should solve it. This tap
had been left on for several weeks.
Think I'll get her to construct my megajolt/megasquirt board next
Skodaman
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