Baxi Bermuda Back Boiler where is the f&e cistern???

[proelitegas]

Hi...was called out to fix a leaking radiator valve and add sludge remover to the system..no drain off valve anywhere in the system and could not find a f&e tank in the roof space...found cwsc that supplies the direct copper cylinder which works with electric immersion heater to provide hot water...i am a little baffled as i was thinking the boiler will have a f&e cistern which i could add sludge remover to when i drain down can not find it any where also no drain valve found i can drop into the void under the house and cut into one of the central heating pipes and let the water drain into the void and fix the leaking valve and install a drain off point but cant find any f&e tank..any 1 out there that can advise would appreciate it..Thanx

 

[stani]

its fed from the hot water cylinder, its a tank within a tank, can't for the life of me think of its name though, bloody old age is horendous.

 

[bert large]

The DOC is sometimes on the side of the chimney breast adjacent to the back boiler, maybe hidden behind a board.
Are you sure the cylinder was a direct one & not primatic as if this was the case there would only be one loft tank.

 

[Poxi]

Primatic Cylinder ???

 

[stani]

Primatic cylinder.........not bad only 2minutes and it came back to me

 

[armourer]

Set up a temporary drain off using push fits (for speed on the snatch fit).
Cut into the pipework under the floor (prepare to get wet and explain why you have to do this to the customer).

After the drain of is in place fit hose and drain as normal and walk around listening to what is refilling(F&E) or if it just stops look for the expansion vessel and filling loop.

Its very unusual not to be able to track pipework though if you understand the basics??

 

[proelitegas]

Thanx seems it is a primatic cylinder...will get under the floor cut into one of the central heating pipes and drain as explained by armourer in my wet suit lol and fit a drain off valve..Thanx for the kwik response...

 

[stani]

dont add inhibitor it can get mixed in with hot water that people may wash in.

 

[proelitegas]

Thanx stani..just looked it up in my books and yes no inhibitor not to be used in case the air bubble packs in and mixes the primary and secondary water...just a question is there danger of loosing this air bubble when i drain down the cylinder and refill once work is done? last thing i want is loosing the air bubble and the water mixing and "mrs miggins" bathing in central heating water lol
any precautions i need to take?

p.s think this website and all members are great! id be ringing my college tutor otherwise and he is a knightmare

 

[Johnty]

Air bubble should be re established as you fill the system!

 

[stani]

as johnty says the air bubble should re-establish itself when you fill the system, I know its hard but just try and do a hot flush at least you will get rid of the most muck that way, and if it is something like 30+ yr old there should be some choice colours.

 

[tamz]

You should not add any type of chemicals to a primatic.

Drain the cylinder at the same time as the heating. The air bubble is self forming but the hot water WILL be dirty for a bit afterwards as it will stir all the muck up when refilling.

 

[desrob]

put air bubble in safe place until needed,primatic can be trouble on refill, i try not to drain and freeze if i can