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- 13 Jul 2004
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A friend of mine has a problem with his Jaguar combi. Basically it was moved by some one I do not consider competent, about 3 months ago, and ever since he has been having problems.
He asked me to have a look ( I am an electro/mechanical engineer but by no means an expert on heating systems). What I found was a cold system pressure of 3.5 bar, with hot pressures in excess of 5.5 bar. Needless to say the relief was lifting. I found the filling loop still connected and fully open, constantly topping the system up.
I closed the loop and dropped the sytem pressure to 2.8 bar by bleeding radiators. We then switched the heating off and watched the pressure drop back down to 0.5 bar with the system still reasonably warm. At the time I put this down to air in the system so we topped back up to 1.5 bar cold and bled back down to 1.0. The hot pressure then peaked at 3 bar but when the system cooled (after I had to leave ) it dropped back to zero.
I dont think there is a leak because it will hold a hot pressure of 3 bar.
I am thinking maybe it is expansion related but I cant get back to have another look until tuesday so I have no idea whether this boiler even has an expansion vessel.
I am starting to suspect that when it was moved the guy who did it came across this problem and left the loop open deliberately to keep the system running, as it faults below 0.8 bar.
Any help or advice is very much appreciated.
Cheers,
Steve
He asked me to have a look ( I am an electro/mechanical engineer but by no means an expert on heating systems). What I found was a cold system pressure of 3.5 bar, with hot pressures in excess of 5.5 bar. Needless to say the relief was lifting. I found the filling loop still connected and fully open, constantly topping the system up.
I closed the loop and dropped the sytem pressure to 2.8 bar by bleeding radiators. We then switched the heating off and watched the pressure drop back down to 0.5 bar with the system still reasonably warm. At the time I put this down to air in the system so we topped back up to 1.5 bar cold and bled back down to 1.0. The hot pressure then peaked at 3 bar but when the system cooled (after I had to leave ) it dropped back to zero.
I dont think there is a leak because it will hold a hot pressure of 3 bar.
I am thinking maybe it is expansion related but I cant get back to have another look until tuesday so I have no idea whether this boiler even has an expansion vessel.
I am starting to suspect that when it was moved the guy who did it came across this problem and left the loop open deliberately to keep the system running, as it faults below 0.8 bar.
Any help or advice is very much appreciated.
Cheers,
Steve