Baxi 105he instant external expansion vessel help please

[redmonp]

Gents,

I have a Baxi 105he instant, I want to fit an external EV on the return flow. I intend to use the 22MM flushing connection to connect it.

Questions.

Do i have to use the RV that comes with the external EV or can I still rely on the boiler RV?
Can I use a braided flexi to connect it to the system?
Do I need to do anything with the original EV (apart from make sure it doesn't leak externally)?

Thanks Paul

 

[1983]

don't know if you have bought your stuff yet but all you need is the expansion vessel and bracket, a 3/4 female x 22mm compression fitting and a 22 compression equal t. cut t into return pipe below boiler, bit of copper to connect vessel and thats it. The boilers prv is fine to use as is the pressure gauge. the existing exp v can just be left in place.
Is this replacement due to a fault or do yo need more capacity?
Personally I wouldn't use a flexi to connect. Just wouldn't trust them.

 

[redmonp]

thanks for that, yes the EV is slowly depressurizing, I have changed the Schroeder and moved it on a valve extender out of the heat zone. The sec heat ex was holed, now changed. Just cant keep it pressurized. I think it perished although it doesn't let water past but does spit.
Thanks anyway, you have put my mind at rest