I moved to a new flat three weeks ago and it has a very old conventional central heating system with a cold water tank, hot water cylinder and a feed and expansion tank. When I moved in and saw the F&E tank (alone in the top of the wardrobe in my room) I wrongly though it was an old cistern for the toilet so I emptied it and closed the water valve. Of course, the next morning the heating started to do some estrange breathing noises and realising my mistake I opened the tank's valve filling it with water again. The problem now is that some air went into the system through the feed pipe an now the hot water cylinder sounds like filling a half empty metallic water tank every morning about 10 mins before the heating starts working. I have checked the radiators and they are hot on the top so they seem to free of air. My guess is that the air is trapped in the cylinder and that's what is making the system so noisy. Could someone offer any light on the problem? Is there an easy way to bleed the system? Many thanks.
AIR in through the F & E tank. Noisy system now!
- Thread starter Benito
- Start date
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Have you got a bleed cap between diverter valve & cylinder connection if so loosen it till water appears
Perhaps the cold fill is blocked and when you turned it back on it hasn't filled the system properly.
I think it will be blocked where the cold fill joins the system pipe work. needs this cutting out and replacing.
I think it will be blocked where the cold fill joins the system pipe work. needs this cutting out and replacing.
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Hello. First of all, thanks for all your advice, I really appreciate it.
I've had a friend with better plumbing skills than me checking the system and he found out that source of the dripping noise was not coming from inside the cylinder. I looks like the pump was on a very high setting, making a strong hissing noise and generating enough pressure to push water out through the vent pipe into the cold water tank. After lowering the pump setting to the minimum the hissing noise is barely noticeable and the dripping only happens occasionally. I still think I could do more to have the system running even more smoothly but I can live with it like this for the moment.
Once again, many thanks for your posts.
I've had a friend with better plumbing skills than me checking the system and he found out that source of the dripping noise was not coming from inside the cylinder. I looks like the pump was on a very high setting, making a strong hissing noise and generating enough pressure to push water out through the vent pipe into the cold water tank. After lowering the pump setting to the minimum the hissing noise is barely noticeable and the dripping only happens occasionally. I still think I could do more to have the system running even more smoothly but I can live with it like this for the moment.
Once again, many thanks for your posts.
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