vent an cw inlet location

[notabodger]

I have just had a Vaillant 428 Open Vent Boiler installed. I have noticed that the 15mm cw inlet is postioned on the top connection of a tee just before the Boiler return inlet. The 22mm vent is postioned on the top connection of a tee on Boiler outlet before the Pump.
The system is working fine with no air collecting in the Radiators and is not noiseyand I think the Plumber piped it this way because it was the most convenient arrangement of pipes.
My only concern is that this arrangement is unusual and not what I have seen before, is it likely to cause any problems in the future ?

 

[notabodger]

Can anyone help with this query ?

 

[buck51]

Was the Installer Gas Safe Registered????

 

[notabodger]

I thought he was, but it turned out that it was his partner that who did all the gas work and commisioned the Boiler. I have no issues with the quality of the plumbing, it's just this unusual arrangement of cw inlet and vent that I am questioning.

 

[CBF]

max of 150mm between them so it's not piped correctly


http://postimage.org/

 

[notabodger]

Thanks for your reply, I agree with what you say. However the system seems to be working fine, what problems could there be with the arrangement I have been left with. The Plumber is not the easiest to challenge, it took a lot of persuasion to get him to correct a problem with the ABV that I had identified. I can imagine that he would tell me that the system is working fine and I should not worry about it.

 

[notabodger]

Not had time to look at this for a few days. But one thing that I now realise, is that not only is the location of the cw and vent pipes unusual, but the Plumber has also put the cw inlet before the vent pipe !
What problems could this cause, could it result in hot water being pumped into the F/E tank ?