UPDATED: Air Source Heat Pumps/Air Con - Full Info & Guide, is it cheaper to run than mains gas?

lovesgshp

Back to your system Richardc for the moment.
Have been going through the manuals, your info and this is what I think.

1) You need to look at changing the circulation pumps to higher flow rate units. The outward/return flow temps look as though they are getting too high. Ideally, they should be around a 7C delta.
2) You are trying to operate the system similar to a conventional system, whereas it is meant to be a 24/7 unit.
Smooth the room heating temperatures, as at the moment you are heating to 21C and then dropping them back to 18C for quite a long time. As I said before, go to 19C and adjust from there, or alternatively stay at the 21C and use the TRV valves for the rooms you need at lower temps.

lovesgshp

Smaf wrote: »

So I should increase my LWT temporarily?

Daiken model?

Smaf_2

Yes its Daikin Altherma.

Inside is set too 21. Outside LWT set too 50

Smaf_2

lovesgshp wrote: »

Daiken model?

Daikin Altherma - Low temperature split

EHBH16CA3V

lovesgshp

How long are we talking about since you returned to the house?
What are the flow temps out of the unit?
Current temperature since you first post in the house?

Smaf_2

Returned yesterday been running 24 hours and is now only on 13 inside.

LWT on tank is 50 if that's what you mean by flow. The radiators are freezing

lovesgshp

Without me looking at the manual, you should have a output temperature from the pump with a return temp on the heating circuit to show the current flows.
e.g. Target temp 50C....... currently 30C.
Looks like it is having to work very hard to bring the house back up to temp.
Is there a additional heat timer activated in the control panel, or are you just operating on the compressor unit?

Smaf_2

There is additional one on unit outside and it's running on Eco Storage and Eco Comfort

lovesgshp

Can you change it to on without the eco setting?

Smaf_2

To a boost mode ?