Discuss back boiler and combination cylinder questions....please help in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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kay-jay

right

went to swap 2 rads today! draining down rolls meself a ***, stood in garden waiting for drain down to finish.

house and rads and pipes stone cold! thinks to meself drain down seems to be taking a while (its a bungalow) then i notice theres steam coming off the water coming out my hosepipe, i'm thinking eh! scratches my head a bit then goes and looks in loft.

f and e tank not draining at all, but cylinder is!!!!

so initial thoughts were tee blocked where f+e tees into heat circuit and some wazzer has teed into the hot distribution adding a rad, thinking it was either flow or return.


question

cylinder looks like a standard combination, but could it possibly be a primatic? and if the feed from f+e is blocked would the suction created during drain down be sufficient to pull the air bubble in the primatic and thus drain rads and hot water header tank? or am i most likely correct in assuming someone has teed the hw into the heating?


also there was no open vent over the f+e, so where the buggery is the expansion going? is there some kind of ancient system which would see expansion elsewhere?


your thoughts would be greatly appreciated.

KJ
 
if you have two tanks its not primatic as they feed from the cws
if its a combination cylinder that would feed from its own built in tank
without pics its hard to say more
 
turned out it was a 'fortic primatic' few and far between but in existence non-the-less.
a quick search on internet proved that it feeds off hw tank and expands into the primatic air bubble. so problem solved. f+e must have been a hangover from previous open vent system.
cheers

kj
 
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