I have an open vented system with a cylinder in the airing cupboard. There is what I believe is called an air vent cap or capillary air vent cap tee'd from the top pipe coil pipe entering the cylinder. it has a small grooved part which is threaded and screws up and down. I am curious as to the operation of this. Is it an automatic vent or is it used manually to bleed air from the cylinder coil - for example after draining the system?
Air Vent Cap top cylinder coil
- Thread starter richig
- Start date
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Manual air vent.
So it operates like a bleed on a radiator? I ask because I am going to drain a bit from the system - only enough to change the circulator valves which are about a metre below the tank. Problem is I have a combined feed and expansion pipe. Will there be any issues with refilling the water drained with this set up?
Yes, it releases air from the HWC side.
I have a combined F&E pipe too (22mm), never had any issues apart from once having trouble removing air from the HWC side. Over a week the air eventually goes but can be helped by rocking the flow by changing the pump speed up and down every few seconds.
I have a combined F&E pipe too (22mm), never had any issues apart from once having trouble removing air from the HWC side. Over a week the air eventually goes but can be helped by rocking the flow by changing the pump speed up and down every few seconds.
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When refilling you can always try back-filling from the drain-cock (water filled hose connected to the drain-cock and forcing air out as it fills). You need someone in the loft to check the level in the F&E tank as you do this though!
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