Hi all,
Possibly someone can help with a couple of queries about air vents. I'll include the background and give as much info as possible so my newbie questions have a context..
I've had a problem with my central heating for a few years (since I bought the house). When it's been running for a while I get an extremely loud banging noise and water gushes into the feed expansion box (and out of the overflow).
I had the system looked at a few times and had the pump and cylinder replaced to no avail, the most recent plumber advised I fit vented elbows on the pipes going in and out of the boiler.. So I fitted a couple of Flamco Flexvent Automatic Air Vents like this one: http://www.anergy.co.in/products/catalogue/prod_images/airvent.jpg
The pipes going in/out of the boiler are 22mm with a right angle a few inches above the boiler. I installed a 22mm X 22mm X 15mm Copper Reducing Tee on each with each vent on the end of a short vertical 15mm pipe (one has a U shaped kink to get around the other 22mm pipe which runs above the tee piece).
But I still have the problem.. that's the background here's my questions:
The vent packaging said to turn the cap one rotation prior to refilling the system, I assumed this referred to the red plastic cap on top and did so on both vents. I assume I leave this loose for air to escape from. Is this correct and is there a simple way to tell (apart from waiting for the banging!) if air is coming out of the vent?
I have since read up on how the vents work and it seem to me that having one on the pipe taking water into the boiler is just going to suck air in, in which case I should shut of the vent on the water into boiler pipe. Am I correct in this?
Any feedback would be appreciated!
Dabbler12
Possibly someone can help with a couple of queries about air vents. I'll include the background and give as much info as possible so my newbie questions have a context..
I've had a problem with my central heating for a few years (since I bought the house). When it's been running for a while I get an extremely loud banging noise and water gushes into the feed expansion box (and out of the overflow).
I had the system looked at a few times and had the pump and cylinder replaced to no avail, the most recent plumber advised I fit vented elbows on the pipes going in and out of the boiler.. So I fitted a couple of Flamco Flexvent Automatic Air Vents like this one: http://www.anergy.co.in/products/catalogue/prod_images/airvent.jpg
The pipes going in/out of the boiler are 22mm with a right angle a few inches above the boiler. I installed a 22mm X 22mm X 15mm Copper Reducing Tee on each with each vent on the end of a short vertical 15mm pipe (one has a U shaped kink to get around the other 22mm pipe which runs above the tee piece).
But I still have the problem.. that's the background here's my questions:
The vent packaging said to turn the cap one rotation prior to refilling the system, I assumed this referred to the red plastic cap on top and did so on both vents. I assume I leave this loose for air to escape from. Is this correct and is there a simple way to tell (apart from waiting for the banging!) if air is coming out of the vent?
I have since read up on how the vents work and it seem to me that having one on the pipe taking water into the boiler is just going to suck air in, in which case I should shut of the vent on the water into boiler pipe. Am I correct in this?
Any feedback would be appreciated!
Dabbler12
