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Ok. I think I do understand what you are saying about the bypass now. Makes sense. If you could explain it in more detail though it would be great. Ta Alan

OK. The gate valve are only there in case I need to do work. They are all open. Taking the tops of is no problem. Why would I want to convert to sealed system? What benefit would this bring me? Can I keep it the way it is yet move the pump to the flow side? I still don't fully...

OK. I did the wiring. I am an electronics technician at work, so I think that is right. I will be doing all the things that you have said to check it. The only thing I want to know from you guys befor you sign off is where do I put the bypass that you mention? Other than that, is the...

There is a cold feed into the system. I am just thinking that the gravity feed does not have enough pressure to force the air out

I am guessing that you are right John. This was my initial thought. So do I go for the hose option and fill it from the top down with the hose to get higher water pressure? The main thing that I want to work it out here as well is whether or not it is all set up correctly? Is the...

The big problem that I have had is that I have NEVER managed to successfully bleed all the air out :(

Cylinder never seems to be too warm. Just right

John, I am not in the house at present. No internet there :( Unfortunately I have only looked at the items mentioned earlier. When you say look at the feed and expansion, what do you mean? Do you mean for me to climb up into the attic whilst the system is running? I am sorry that I...

No Mick. No combined feed and vent. I just thought that maybe I should combine the old feed and vent into each other. Maybe I am totally wrong here though. The system goes as follows. Hopefully this makes sense. Thanks for the patience by the way Old system (worked) Out of...

Added a few more pics on. Thanks

Surely if both motorised valves close then the boiler and pump shut down? Is that not the idea?

It is a vented system and I do have a feed an expansion. My cold feed is in the attic up at the header tank. My vent goes up through the airing cupboard (the straight pipe with the little stop end in it) It vents up to the header tank. The other pipe with a stop end in it in the picture...

Hi there. Some images can be seen at http://picasaweb.google.com/yellowmitch/Heating?pli=1&gsessionid=VgSM5YMcaGZdTzHqeKqDSg# I am trying to upload more. John, what is f&e? (full and empty?)

Heating

Thank you. I will take some photos now and try to write a more indepth description

I will check all this and get back to you within the hour. Alan

John, It is a vented system with expansion tank in the loft I did drain it down and refill it. There is no bypass valve Alan