Moving an air source heat pump unit

[cheb]

I want to raise the ground level under this unit by about 100mm and that's more than the flexible connections would allow. I'll have to disconnect and shorten the fixed copper pipes, that's easy enough, but I've can't find suitable advice about what I have to do after reconnecting. The flexies are the two pipes running horizontally from the unit.

My plan is to close both valves in the picture (and in real life), undo the compression fitting on one pipe, shorten the pipe, cap both ends and then do similar to the other pipe. With both valves closed there should be no flow through the system so I won't lose much fluid. I've got spare fluid if topping up is needed.

I'll disconnect the electrical supply too.

What obvious things have I missed?

 

[TEO]

I can't see anything wrong with your plan but I'm going to pass it on to a guy who's done a lot of them, see what he says.

 

[Kayos]

Really it will need a full commission, however a working unit will likely just need the air purging and should just work

If it was my house, I'd make sure the auto air vents worked, topped the pressure up and run it

 

[cheb]

Thanks.

 

[cheb]

That was my basic plan. I understand enough about it but if it doesn't work I can get it sorted and be none the worse off. I don't rely on it, I have a woodburner for heat and can wash in cold water.

 

[Trevorleach]

Do the pieps carry coolant or refridgerant?

 

[Kayos]

Do the pieps carry coolant or refridgerant?

Water, it's a monoblock unit

 

[TEO]

I want to raise the ground level under this unit by about 100mm and that's more than the flexible connections would allow. I'll have to disconnect and shorten the fixed copper pipes, that's easy enough, but I've can't find suitable advice about what I have to do after reconnecting. The flexies are the two pipes running horizontally from the unit.

My plan is to close both valves in the picture (and in real life), undo the compression fitting on one pipe, shorten the pipe, cap both ends and then do similar to the other pipe. With both valves closed there should be no flow through the system so I won't lose much fluid. I've got spare fluid if topping up is needed.

I'll disconnect the electrical supply too.

What obvious things have I missed?

View attachment 470755

From a mate who's done quite a few:

" in this case I’d imagine his approach is absolutely fine. There might be a robocal-type valve to bleed out the air somewhere, if not then cracking open a fitting at the highest point and bleeding as normal should be fine."

 

[cheb]

Thanks very much. There's a 15mm blanked compression fitting at the highest point.

 

[TEO]

Thanks very much. There's a 15mm blanked compression fitting at the highest point.

Maybe this is the opportunity to put the valve in place of the blanked off end & win both ways.