Optima 701 pressure vessel valve

[JimTech]

I have an Optima 701 boiler, which needs to have the pressure vessel recharged.

I've studied the diagrams in the manufacturer's manual, and climbed all over the boiler, but I just cannot find out where the valve is!

Can some kind soul point me in the right direction, please?

I'm no plumber, (an IT Engineer actually!), but I installed my central heating system myself in a previous property, about 15-18 years ago, courtesy of Texas Homecare, so I thought this should be a doddle!

 

[Agile]

You have to identify the EXV and then look all over it for the air valve.

Looks like a tyre valve!

Tony