We’ve had our Daikin 16kw for over a year now. We recently had the Octopus annual service, which was highly disappointing - as I wanted to discuss the amount of times it defrosts and what I should be expected. However, the guy clearly had no idea what a defrost cycle on a HP was.
I know that it’s all very dependant on temperature and humidity. However, I can’t help feel like ours defrosts a lot.
We run using Madoka, fully open system, UFH downstairs - we had an overlay system installed so I think the pipes are 16mm or less. Radiators upstairs. The primary pipework from the HP to the cylinder is 28mm. There are 3 radiators which are still piped with microbore.
Our heat loss from Octopus was 11kw, BG gave a heat loss of 9kw. I think we sit between the two but closer to 9kw than 11kw.
The weather curve is relatively flat with a max flow temp of 43 @ -3 and min flow temp of 32 @ 15 from memory.
There are a number of things that I’ve thought:
- Is the primary pipework too small from HP to cylinder - someone mentioned it should be > 28mm
- Alternatively, change the HP from 16kw to 11kw?
- We have plastic running to the UFH manifold - would upgrading to copper change anything
- Flow rates through the UFH - additional pump?
- Change the microbore
- Larger volumiser
https://emoncms.org/app/view?name=MyHeatpumpv2&readkey=7034e0830547fb8e3d56978a24793bc0