About a year and a half ago we had an issue with our CH system, which had an air separator as shown in the diagram below (although the vent pipe was straight up to the FE tank)
Turned out that the separator was silted up and the point where the 15mm cold feed joined the separator was blocked solid. Things being what it was all efforts to obtain a replacement quickly failed, so I simply removed the separator and connected the pipes as per the diagram below
However, since replacing my pump I've noticed that when the pump starts it sounds like air is bing drawn in the moment it starts, so I'm looking at two possible fixes and would like your oppinions.
The first is to change the Tee where the 22mm feed to the pump from a 22mm - 22mm - 15mm tee to a 22mm all round, and then reduce the 22mm to 15mm 6" up the feed
Or fit a new separator :
Turned out that the separator was silted up and the point where the 15mm cold feed joined the separator was blocked solid. Things being what it was all efforts to obtain a replacement quickly failed, so I simply removed the separator and connected the pipes as per the diagram below
However, since replacing my pump I've noticed that when the pump starts it sounds like air is bing drawn in the moment it starts, so I'm looking at two possible fixes and would like your oppinions.
The first is to change the Tee where the 22mm feed to the pump from a 22mm - 22mm - 15mm tee to a 22mm all round, and then reduce the 22mm to 15mm 6" up the feed
Or fit a new separator :