Heating works very slow recovery on DHW pipe design question

[holty]

just wandering if this could be a problem with the injector T,on the return pipework off the cylinder,thats if it has one.

 

[cjd10]

here is the pic of the cylcinder the 22 m pipe is the vent from the boiler the U bend is the cold feed from the F&E tank attached to the top of the cylinder coil inlet

Ignore the cylinder stat its not connected

the gate valve is open and free I had it apart last weekend

thanks chris

http://s223.photobucket.com/albums/dd37/cjd10/?action=view&current=cjd10.jpg

 

[cjd10]

It does not have an injector T fitted

also yes its a soft water area

 

[cjd10]

chris R any comments on the PIC yes it is pumping over at the start and then settles back very little flow

 

[cjd10]

Phew cracked it

the system height (height from tank to F&E) is 7 metres, vent goose neck height was too small

fitted a longer goose neck as per instructions from plumbing book and hey presto I now have Hot water,

(I changed the filler washer in the F&E tank two weeks ago that was enough to change the mean height of the water and cause a flow problem)

Poor design overall and yes I think it was an old gravity system but at least I am back in business

thanks to all the posts it helped

cjd

 

[cjd10]

whilst hot water OK recovery very slow poor flow

took out cylinder and flushed OK, only pipe left was the connecting pipe from vent to cylinder - you can see connecting pipe in picture

cut into and removed pipe hey presto it was totally blocked what was 22mm now had a 1 to 2mm hole in centre.....

replaced pipe now working like a dream with fast recovery......