I have an open vented 'y' plan heating system, an indirect cylinder and a Potterton Flamingo (40K btu I think..) CI wall mounted boiler in a small 3 bed semi. Boiler in garage with balance flue through wall.
F&E tank and HW cold feed tank in loft.
All the rads have trvs fitted except the one in the hall, where the room stat is located.
The cylinder has been replaced and nearly all the pipe work replaced with an air seperator added to try and alleviate air build up in the hall rad.
I am reasonably competent with CH but not an expert...
In general the system works OK all new controls seem to turn the CH/HW on and off correctly, shutting the boiler/pump on and off as normal.
The problem I have, occured before the new pipework/cylinder was installed and has occured once since the new pipework installation.
It appears that the primary water is getting so hot that it is heating the water in the F&E tank to the point where it is evaporating into the loft space.
The boiler main stat (big dial on front) is set at 2 of 5
The loft gets absolutely soaking, as if someone has sprayed a hose up there.
It is definitely a condensation problem - turn the boiler off for a few days and it all drys up.
My theory is that as the trvs are satisfied the amount of water circulating is reduced and the water is overheated by the boiler until the room stat is satisfied.
1.Is this possible/probable?
2.Would an addition of a an auto bypass (bypassing the 3 port valve) help?
The hall rad has no trv and both valves are fully open. Is this not
sufficient to give enough flow rate to stop the boiler overheating?
3.Could the boiler stat be faulty? - how can i tell?
4.If the boiler stat is faulty, I replace it, then, is it acceptable for the system to utilise the boiler stat when it gets to the nearly satisfied condition of the room stat?
5.What temp should the water be in the F&E tank?
Thanks DKBB
F&E tank and HW cold feed tank in loft.
All the rads have trvs fitted except the one in the hall, where the room stat is located.
The cylinder has been replaced and nearly all the pipe work replaced with an air seperator added to try and alleviate air build up in the hall rad.
I am reasonably competent with CH but not an expert...
In general the system works OK all new controls seem to turn the CH/HW on and off correctly, shutting the boiler/pump on and off as normal.
The problem I have, occured before the new pipework/cylinder was installed and has occured once since the new pipework installation.
It appears that the primary water is getting so hot that it is heating the water in the F&E tank to the point where it is evaporating into the loft space.
The boiler main stat (big dial on front) is set at 2 of 5
The loft gets absolutely soaking, as if someone has sprayed a hose up there.
It is definitely a condensation problem - turn the boiler off for a few days and it all drys up.
My theory is that as the trvs are satisfied the amount of water circulating is reduced and the water is overheated by the boiler until the room stat is satisfied.
1.Is this possible/probable?
2.Would an addition of a an auto bypass (bypassing the 3 port valve) help?
The hall rad has no trv and both valves are fully open. Is this not
sufficient to give enough flow rate to stop the boiler overheating?
3.Could the boiler stat be faulty? - how can i tell?
4.If the boiler stat is faulty, I replace it, then, is it acceptable for the system to utilise the boiler stat when it gets to the nearly satisfied condition of the room stat?
5.What temp should the water be in the F&E tank?
Thanks DKBB