Ground Source Heat Pumps

beardymarrow

lstevensuk said:

Great thank you. Just checking I find the 'out' loop first from your picture then turn off both the valves on that loop? @beardymarrow it is an IVT pump. Are there ranges I need to make sure they keep inside for the G10, 11 & 6? And the pump speed?

You need to turn off both valves on one loop (ie one on each of the manifolds). It's important it's the same loop though. If you turn off the in on one loop and the out on the other you'll get no flow at all. If you only turn one valve off, you'll still be getting pressure in the loop and it'll still leak (although possibly not as badly). 

I've attached the manual which has the gt10 - 11 delta. The actual temp is not so important as the difference between the two. 

lstevensuk

Great thank you, will start the process this evening and see what happens this week.

DeeWestern

Will keep my fingers crossed that you don't fix the problem 🤣

lstevensuk

I turned the two lower valves off, and received an Alarm (LP) Low pressure warning, within a few minutes, with option to Acknowledge. Is it ok to keep the valves off or have I done something wrong 

beardymarrow

lstevensuk said:

I turned the two lower valves off, and received an Alarm (LP) Low pressure warning, within a few minutes, with option to Acknowledge. Is it ok to keep the valves off or have I done something wrong 

You've done something wrong 😁. You need to turn off both valves on one loop. What you've done is turn off one valve on both loops.

lstevensuk

Opps!  Ok I turned these two off and so far no more warnings overnight. How can I tell they are on the same loop though? Looks like I did lose some glyco.

DeeWestern

lstevensuk said:

Opps!  Ok I turned these two off and so far no more warnings overnight. How can I tell they are on the same loop though? 

It's just good luck - if you'd turned off different loops, then the GSHP wouldn't have worked (as it couldn't push out on loop 1, or get anything back on loop 2) so you must have done it correctly. I'd leave it a touch longer until you're really sure you've lost a similar amount of glyco, then turn the closed loop back on before turning the second loop off.

beardymarrow

DeeWestern said:

lstevensuk said:

Opps!  Ok I turned these two off and so far no more warnings overnight. How can I tell they are on the same loop though? 

It's just good luck - if you'd turned off different loops, then the GSHP wouldn't have worked (as it couldn't push out on loop 1, or get anything back on loop 2) so you must have done it correctly. I'd leave it a touch longer until you're really sure you've lost a similar amount of glyco, then turn the closed loop back on before turning the second loop off.

I agree. You'd hope both left hand valves were for loop 1 and both rights for loop 2, but you never know. As Dee says though, if you'd turned off one valve to each you'd get no flow at all, so the GSHP would stop working. 

lstevensuk

I've now switched over to the second loop. I lost a good cup full of gylco. Signs are not good on the second loop, overnight I have gained a few mm 

beardymarrow

lstevensuk said:

I've now switched over to the second loop. I lost a good cup full of gylco. Signs are not good on the second loop, overnight I have gained a few mm 

Oh, that's not good :-( Sorry mate. Gaining a few mm can be just due to pressure when it's pumping or temperature, but it's definitely an indication that the pump itself and that loop aren't leaking, and that the problem is loop 1. It might still be around the manifold above ground on loop 1? It's way more likely to be a joint leaking than the pipe itself. Worth spending some more time ruling that out for definite. Either way this has been a useful exercise as you won't need to drain and leak test both loops :-).