re; power max 155 not draining down

[doblo7]

Help please,
I have removed an upstairs radiator by shutting off valves. I have emptied the expansion tank in loft. I shut off all the upstairs rads and started to drain via the valve on removed rad. I had filled 12 buckets before I came to the conclusion that the system isnt draining down. I cant understand why, the ballcock has been stopped so its not refilling via the expansion tank.....can anyone advise me on this problem? thanks

 

[ollski]

powermax is a thermal store cylinder meaning the body of water in the cylinder is your heating water....quite a few bucketfulls!

 

[doblo7]

Thanks for your reply. Much appreciated!