expansion vessel (glowworm)

[smifme1]

ive jus had to drain water out of expansion vessel but not air , do i have to release air to refill with water or do i just refill system

 

[45yearsagasman]

Its a good time to make sure that the air side is charged properly before filling up your system. Make sure exp vessel is pumped up to 1 bar(approx) and then refill your system in the normal way and bleed all air as you go.
What about replacing lost inhibitor?

 

[smifme1]

replaced inhibitor and plate heat exchanger due to lack of inhibitor and gave everything a good clean thanks for info