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- 3 Sep 2005
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I think I have narrowed down my issues to air being trapped in the DHW heat exchanger.
The boiler is a Vaillant Ecotec 937 with the storage unit on the back - the central heating is fine and works no problem but if you set the thermostat for the hot water above 42 then there is an awful racket from the combustion chamber area.
I have tried the bleed test programm about 5 or so times and letting hot water taps run for while to cycle the water.
The expansion vessel for the hot water storage unit is at 0 bar and it needs to be 4 bar but i cant fill it with air because the storage unit is full with water.
I have tried turning the isolator on the filling loop to the storage unit and turning on the hot taps but it doesnt drain the storage unit fully - do i have to try and suck the water out as i cant get it to empty !!
Plus any better ideas on getting air out of the heat exchanger ?!!
Thanks
Shady
The boiler is a Vaillant Ecotec 937 with the storage unit on the back - the central heating is fine and works no problem but if you set the thermostat for the hot water above 42 then there is an awful racket from the combustion chamber area.
I have tried the bleed test programm about 5 or so times and letting hot water taps run for while to cycle the water.
The expansion vessel for the hot water storage unit is at 0 bar and it needs to be 4 bar but i cant fill it with air because the storage unit is full with water.
I have tried turning the isolator on the filling loop to the storage unit and turning on the hot taps but it doesnt drain the storage unit fully - do i have to try and suck the water out as i cant get it to empty !!
Plus any better ideas on getting air out of the heat exchanger ?!!
Thanks
Shady
