Baxi Solo WM 50/4 RS - need refilling?

[arun2001lk]

Hi All,
I want to change the motorised valve V4043H on a Baxi Solo WM 50/4 RS, but not able to find the filling loop or anything around boiler. could you please let me know how to drain down and refill it?

 

[denso13]

Is it a sealed system? Most likely not, and topped up by a feed and expansion cistern in the loft. Do you have a large and small cistern in the loft?

 

[arun2001lk]

Is it a sealed system? Most likely not, and topped up by a feed and expansion cistern in the loft. Do you have a large and small cistern in the loft?

I think, it is a small cistern in the loft

 

[Hugh Jaleak]

Then you have an open vented system. Turn off boiler, pump etc. Isolate the supply to the small cistern (or tie ballvalve up), drain system to below motorised valve. Replace valve. Restore supply, system will refill via the cistern. Bleed rads etc as necessary before switching boiler back on.