I have recently moved house and am checking over the CH/DHW system.
There is a Myson AerjecII air separator in the circuit from the boiler to the pump, but it seems to have been installed wrongly.
A photo of the installation is at:
What effect, if any, will this have on the working of the Aerjec and the CH/DHW system
If you google for the Myson Aerjec you should find a supplier link (could have been BES) that includes a description and also shows the various orientations it can be installed in. Can't make it out on the photo quite, but it appears that one of the vertical legs isn't connected to anything. If so then I am reasonably certain that the install is OK in orientation, but piped incorrectly.
Phil
Here is another photo showing the thing in close up
As you can see, the pump is connected to the side of the Aerjec, but the fitting instructions say that the vent pipe should be connected here. It may not be anything to worry about though I do get a noise like needles rattling in a tin coming from the radiators when the pump starts up. Could it be air getting into the system via the Aerjec? I can't find a diagram of the inside of one so I can't see how it works.
It isn't connected properly.
I presume that the small pipe behind the vent pipe and the Aerjec and almost hidden is a 15mm pipe. Trace this one and see if it goes to the bottom outlet of the small feed tank in the roof.
If it does, then this should be connected to the Aerjec as well, on the side.
Take a look at
As you can see the orientation of the Aerjec is not important but in your case, which is closest to the third diagram, the pump should connect on the bottom where it is blanked off and the cold feed on the side.
As it is, I suspect that what has happened is that someone, not understanding what they are doing, has added this in an attempt to fix a problem of air or of hydrogen from corrosion in the system. Often this comes from pumping over from the vent pipe or sucking in of air through it. This happens when there is too big a differential of pressure head between the feed pipe and the vent, typically if they are connected on opposite sides of the pump or of the boiler.
If you trace the feed pipe down, it probably connects to the boiler on the opposite side to the vent.
The Aerjec achieves two main things.
1) The vent and feed pipes are connected to a point on the system where they are on the main circuit and close together. This prevents pressure differential and pump over/suck down. 2) Any air in the system coming through the boiler to the pump passes through the Aerjec where bubbles can then leave through the vent rather than to the pump. After a refill, when there is a lot of air in the water, this will clear it pretty quickly. 3) All of this can be achieved while still maintaining the safety integrity of the flow from the boiler having an unhindered path to the vent in order to allow steam to escape should the boiler develop a serious fault and boil the water.It really out to be sorted out. It is probably safe in that there is a clear path from the boiler. It is doing something to remove air. It is not helping if there are any issues with pump over or suck down. via the vent.
I sort of assumed the 15mm pipe (hidden behind the vent and in front of the CH flow) was the dumb bypass where it comes of the top of the pump goes to the return form the cylinder coil.
If the vent is a combined feed and vent pipe and provided the pump is pumping UPWARDS then the only thing wrong is that the pump should come off the bottom of the unit.
I presume the 15mm pipe coming off the top of the coil connection just leads to a bleed point (or maybe a towel rail?). If it's a feed pipe from the header tank then there is a big problem.
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.