gravity DHW pumped heating upgrade???

[illloyd3]

hi got an install to do 'exsisting, ground floor boiler ,loft (2nd floor) cylinder-FE tank, 28mm flow return to boiler reducing to 22mm onto cylinder coil with the OV and WF from FE tank on 22mm flow just before cylinder. heating pumped ground floor 22mm reduced to 15mm - typical 70-80's set up would like to convert fully pumped but cant figure how with out ensuring system vented at all times. pipes in solid floors down stairs so dont want to pressurise?
can i still put a new boiler onto this system if i 2 port the Gravity return and fit cylinder stat (C plan) ?????


any ideas???

 

[crashndie]

yes thats fine not ideal set up but works well.. make a s plan set up on the returns with the pump behind them.....
or best way is to install the pump and zones in the cylinder cupboard take the cf and ov make it combined before the pump (stop it dragging air in) and make a new drop for the central heating flow to the 2nd floor rads, pipe returns up at the boiler as normal