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Many thanks :) How do these look ? http://www.screwfix.com/p/end-feed-air-vent-cap-15mm/52451

Many thanks for your reply. You are correct. I'm going to T off then vertical 2.3M across then down 2.3 M to the new rad. What about a bleed valve on the horizontal run or 15mm drain valve?

This must be a daft question, nobody know the answer to this please? Thanks Slipperz

Hi, I'm in the process of renovating the downstairs bathroom and I wish to add a radiator in there. The roof is a flat roof with nothing above. The floors are solid :( I can break into the two pipe system in a nearby room but this would involve running the pipes vertically up to the...

I guess this must have been wrong since the house was built / heating system installed!! Think I need a heating eng to have a look. I spoke to one and he said the return from the cylinder must be the last connection to the boiler. ie no tee off for central heating?? Slipperz

Cheers Nath I shut the valve and fired up HW again and the TEE that goes to the rad was getting red hot straight away.....Gate valve needs replacing? slipperz

I think I may have sussed out whats going on.... The pipe from the bottom of the cylinder goes through a 22mm gate valve then Tees off 15mm to the radiators!!!!!! So if I shut this valve in it should sort the problem out?? Slipperz

Ports B and AB both warm at the same rate. This time when HW was selected PORT A was cold and B getting hot although the radiators were getting hot!!! Now has the previous 3 port and now this 3 port been put in incorrectly??!! PORT B goes straight into the cylinder and PORT A goes...

[/url] Many thanks again for the reply, and those diagrams will come on handy! The wiring is a real snakes wedding and not as per most diagrams that I have seen online so far (only utilises 8 terminals instead of the 9) , although everything seems to tie in correctly, I will double check...

Many Thanks. I had printed those out to go through. Think I will make a fresh start in the morning with a clear head and go through the procedure. Are new valves ever faulty? I bet they are sometimes! Slipperz

Thanks for the reply Nath. The white wire - is at 6v to N / E with HW selected The gate valve comes off the bottom of the cylinder and disappears down stairs (22mm) Regards Slipperz

Hi All this is my first post so go easy!! My central heating system is a conventional open tank jobby with hot water cylinder with a 3 port mid position valve, room thermostat and cylinder stat with a Siemens RWB9 programmable controller. For years when i selected HW the radiators got hot...