DIY Doctor

Air in cental heating system

Postby johnwilkinson » Fri Dec 14, 2007 12:40 pm

I am having some building work done, and in the process, I wanted to change my microbore system to a 15mm system. This has to be done in two stages. The first is to add 4 new rediators, on 15mm system, in a new extension to the house. Then, when we have moved all our clutter, replace the remaining 6 rads.

The heating engineer moved my boiler into the loft, and converted it to a sealed system. All went OK, and while we were all microbore, no problems.

Since we have had the new rads on the system, there seems to be a large amount of air when the valve turns to hot water.

The engineer fixed this the other day, and last night, I decided to go look at the pressure... it was 0. So I opened the fill valves, but could only raise the pressure to 1 Bar max, even if I opened the valves fully.

Ok, so 1 Bar is workable, but then outside the vent pipe was dripping water, and yet the meter still shows 1 Bar.

Then the hot water started to heat up, and air was back in the system again.

Does anyone have any ideas.
Surely if there was a leak in the new system, we should have seen a lot of water by now?

I am so worried that the new floors will be laid, and that there is a fault beneath the boards.

Best regards,
John :?
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