The inherent higher resistance of microbore piping results in greater pump pressures than a normal system. That increases the risk of air being sucked into the system and of pumping over in the F&E tank.
Because a sealed system is "sealed", once you have got the air out of it there is nowhere for air to re-enter.
With a mixed system balancing becomes very critical and all the balancing on 15mm fed rads is within the first 180° of opening of the lockshield valves.
If it makes you feel better, I can say that ICANHELP is also very abusive to me as well. You will note that he hides his identity like most of the abusive people on forums.
I do agree though with the sentiments he expressed about DIYers trying to do what they are not qualified for.
You did not help because you said "I fitted" this and that ! You only later said it was under the guidance of your friend who is a "professional" plumber.
I dont understand how any "professional plumber" can be stumped with a very simple heating system circulation and air ingress problem. Thats daily bread for anyone working in the industry.
Sorry about your plumbing woes Yellowmitch.
It's a bit of a bummer when it goes wrong. You can rest easy though as you're just a diyer.
Try saddling up like me and making a living at it. (well part time anyways) When it goes t@ts up you can sure have a lot to listen too.
I prefer plant/rooms and boiler house work meself. Last inside work I done I flooded an entire ground floor in a posh estate when a push fit on a mains supply popped off.
I was long gone though so no come backs. he he happy days.
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