I think my hot water cylinder hasn’t been plumbed in properly

[pspec]

.

I think my hot water cylinder hasn’t been plumbed in properly …


It’s a dimplex unvented mains pressure one (with a pump to make a hot water ring/loop so you have instant hot water at all taps).


First the problem (oh I should say I keep the loop thing turned off)


Most of the hot water taps temp are about 35% colder than if the loop is tuned on and it doesn't matter how long you let it run for it wont get hotter..


When running kitchen tap you need to run around six buckets of water before it get warm and it never seems to get really hot…


So this loop thing


Hot water comes out the top of the tank runs to all the taps then to a pump then it joins the cold water feed that goes into the bottom of the tank. I’m calling it a loop as I don’t know its proper name and it seems to make a loop so loop it is…


I’m thinking (with the pump turned off) when you turn a tap on its drawing hot from the top and cold from the bottom and that’s why I’m getting this 35% temp drop. The kitchen tap I think could be at the end of the loop and therefore closer to the cold so it could be drawing more cold than hot…


I’ve found an old Dimplex manual that shows there should be a one way valve before the hot water pipe joins the cold on its way back into the tank.

If I’m correct by adding a one way valve I think this should sort out the problems.


But I’m not sure if it already has a one way valve so I’ve posted photos showing the pump and the pipes going back to the hot water tank. It doesn’t look like there's a one way valve but then I’m not sure what it would look like. On both sides of the pump there are a large copper type joints that joins the pump to the pipe could the oneway valve be in one of them..

Second possible problem….


Looking at the above diagram it shows a swept Tee joint where the hot water return joins the cold pipe


As you can see in the photo above I have a Tee joint installed there. Would this course a problem..


Sooooooooooooooo

I’m I correct and I don’t have a one way valve and I do need to install one…………….???????????????

Also the diagram shows the one way valve installed after the pump. can I install it before the pump as there’s no room to do so before it without ripping the whole thing apart………???????????????????????

Can I leave the Tee joint on the in feed pipe or do I need to change it to a swept tee joint………??????????????

Thanks

 

[bambers]

You shouldn't be playing with this it comes under G3 of building regs and should only be worked on by a registered engineer whether installing or maintaining, it looks like a new install so you should also have got a certificate for building regs notification for the work, you need the get the installer back assuming he/she is G3 certified if not employ someone who is, don't want to over dramatise but if not installed you could create an explosive situation

 

[Daniel Hall]

Hahaha look at the string! Class!

 

[SavageW]

Going by the pictures an just the fittings used alone looks like a DIY job in my opinion,looks like one of my boys meccano sets