Ground Source Heat Pumps

Fort_2

The return pipe is hot coming from upstairs, from T connection where it goes back Into unit and into ground floor circuit , pipe gets colder towards ground floor return.  And sensor fitted just before T coming from the unit . 

Fort_2

Sensor is about 30cm above unit on return pipe. Maybe you can see a thin wire On the back wall. It is definitely not a 1 or 2 m from unit.   

I should probably replace that faulty valve before moving sensor. 

beardymarrow

Fort_2 said:

Sensor is about 30cm above unit on return pipe. Maybe you can see a thin wire On the back wall. It is definitely not a 1 or 2 m from unit.   

I should probably replace that faulty valve before moving sensor. 

Yep, agreed. Replace the valve, check all OK, and then move the sensor. It'll be getting a false high reading through the pipe work from the GSHP. Not enough to cause a problem, just not as efficient as it could be.

Fort_2

A bit of advise needed. Just want to be sure that all is right with my heating system .

I have a heating flow splitting with T to ground floor and first floor heating and return pipes are on T as well on unit.  Is this right, i mean return pipe is head on flow from ground floor loop and first floor loop at T connection when entering back to unit.
i would think thad One of the return Pipes should be installed so that there is no pressure  going towards it, maybe one of the return pipes should be on 90 degrees and other T from the top so that both loops going same direction and not one against other? 

beardymarrow

Fort_2 said:

A bit of advise needed. Just want to be sure that all is right with my heating system .

I have a heating flow splitting with T to ground floor and first floor heating and return pipes are on T as well on unit.  Is this right, i mean return pipe is head on flow from ground floor loop and first floor loop at T connection when entering back to unit.
i would think thad One of the return Pipes should be installed so that there is no pressure  going towards it, maybe one of the return pipes should be on 90 degrees and other T from the top so that both loops going same direction and not one against other? 

Sorry mate, I can't picture what you mean. Can you draw a little picture and take a photo of it?

Fort_2

I thought it would be hard to understand. 

Top plan is existing and bellow how i think should be.  I thought ground floor loop good be Blocking 1st floor return as they both go into same pipe against one another.  As there is temperature difference between gr floor and 1st floor in winter. Upstairs much cooler. 

beardymarrow

Fort_2 said:

I thought it would be hard to understand. 

Top plan is existing and bellow how i think should be.  I thought ground floor loop good be Blocking 1st floor return as they both go into same pipe against one another.  As there is temperature difference between gr floor and 1st floor in winter. Upstairs much cooler. 

Hi, The top one looks fine to me. You'd just adjust the flow through the rads to ensure that you got a decent split of flow between 1st floor and ground floor, which you'd have to do with the second one anyway. Your problem is that you'd want the GT1 sensor between the T and the boiler, but 1-2m away from the boiler, which looks like it might be tricky if that bit from the boiler to the T is short.
Seperate topic, but one of your pictures above shows a tag reading "Bypass", but your diagram doesn't show the bypass which should go betwee the T and the boiler (but after GT1 sensor) and link the out and in loops together (with a restricting valve between them to prevent it being used in normal operation).
I'm attaching the manual for the Greenline HT Plus C and E and also a newer installtion manual for the Greenstore LECP which is very similar, just a more up to date version (but the manual goes into more detail). There's diagrams in there that are really helpful.

Fort_2

Thanks will look into them .
my system installation looked dodgy to when we moved into house about 12 years ago, it was a new built and still under warranty. Had installers back, i asked them questions but all they said that everything was fine and working as it suppose  to. 

I have bypass valve fitted right after flow leaves the boiler it is T Into return pipe, that is T back into boiler were it has stop valve with strainer before going into boiler, and other end goes into return pipe where i have return sensor fitted. 

As per my top drawing

Fort_2

So if i make like i drawn on second plan but make that joint away from boiler on return pipe from ground floor loop. Would that be better to position sensor? 

Bypass is between return T From both loops, first and ground floor and boiler and before sensor. Depends how we look at it. 

If it makes sense i have marked the layout.
blue- flow
green - return
ref- bypass
yellow- return T from ground and 1st floor were i have sensor. 

Fort_2

If do something like that, would that be better, you think?
i will be replacing that valve, could move pipes a bit at the same time.