Flow rate needed

[jamesdiyer]

21 minutes ago, dpmiller said:

sort that knot of restrictive elbows at the back of the outdoor unit and your issues will disappear, I reckon. No calculator needed.

Would you propose using a Flexi to exit the back then? As we need to make a 90deg to enter the building. 

 

Perhaps just bend 35mm plastic 

Edited November 5 by jamesdiyer

[dpmiller]

Flexis are recommended regardless, but yes either a formed bend or a radiussed bend fitting instead of those elbows. Personally I'd try to minimise the number of those pressed fittings used where possible as their ID can be surprisingly small...

[jamesdiyer]

9 minutes ago, dpmiller said:

Personally I'd try to minimise the number of those pressed fittings used where possible as their ID can be surprisingly small...

 

Yes! Exactly. 

[jamesdiyer]

So there hasn't been an update on this as I was hoping the installer would have some decency, sadly they're now a ghost. With it being winter I can't do much. However due to issues with antifreeze being too high and two connections leaking I needed to resolve the situation behind the machine. I took the opportunity to swap the hot mess of 90s to a braided flexi. And as prediction the flow rate went from 1740 to 1860. 

 

It's not pretty as the plastic pipe is a bit long but I don't want to drain the whole system to fix it, I'll sort it in the next warm period or properly in summer.