Depressurise the system ?

[nichos]

Hi, I want to cut insert shutoff valves in the two pipes feeding the shower head. The fotos below show my OZO H/W cylinder system with two pressure cylinders. How to depressurise them to allow cutting the 15ml copper showerpipes? , or do I have to drain the HW cyclinder? .........Thanx .......nick

 

[lame plumber]

turn off your mains stopcock and open a hot and cold tap on the ground floor, leave the rest alone your not qualified to play and do work on the system you photographed. once the hot and cold stop running cut the pipes with a towel and stop ends to hand just in case you've scwred up your pipe id and hit the rad circuit

 

[albatross]

You need a camera that can take colour photos!

Easiest solution is to turn the mains water stop tap off (maybe under kitchen sink). I can only see a valve there that will do the hot and the mains will do both for you as you need to do the cold too.
After you have turned it off open some taps to let the pressure out.

 

[lame plumber]

got an echo wherever I go tonight

 

[IDCHAPPY]

The red one is for your heating system

 

[0304Driver]

I know you cant tell for sure from the pics, and the fact there could be another pressure reducing valve on the cold mains but looking at the pics, its good to see another installation without balanced hot and cold! Its not that difficult to do it correctly is it?

 

[Ermintrude]

Turn boiler off? Unvented controls might be faulty?

 

[Ermintrude]

Thought oso gave u a flexi? I wondered where balanced cold was after multi valve and why the expansion relief was fitted to the cold water draw off nrv tee and not back end of MFV?

Not familiar with oso, but assume that as tprv is low down on cyl it's got a baffle?

 

[ADM360]

Not familiar with oso, but assume that as tprv is low down on cyl it's got a baffle?

Think it has as it has the instructions for resetting if discharge fro PRV!!

 

[IDCHAPPY]

it has a baffle yes

 

[gassafe]

Yeah internal baffle, and flexi supplied on old OSo's so all is okay... External expansion probs additional or to repair a previous internal baffle fault!

Why cut iso valves into shower pipes? Cold mains isolates both supplies pretty easily?

 

[albatross]

got an echo wherever I go tonight

Being from t'yorkshire I'm a slow writer! When I start writing you have written nowt. My the time I finish you have beaten me to it!

 

[nichos]

THANK you all for the help. The mains water shutoff did the trick enabling me to open up the Aqualisa shower & change the cartridge seal. Also fitted tow inline shutoff valves for future convenience. Best wishes.

 

[jam1979]

mains off all the time for me as then u can breath a bit easier when it starts to pxxs out

 

[Dotty]

THANK you all for the help. The mains water shutoff did the trick enabling me to open up the Aqualisa shower & change the cartridge seal. Also fitted tow inline shutoff valves for future convenience. Best wishes.

Thanks for coming back and letting us know how you got on.