Test 2
- Outside temperature back of unit: 3.1C (rising to 3.7C during the max output period)
- Metoffice outside temperature: 3.1C
- Metoffice dew point: 2.0C
- Metoffice relative humidity: 94%
I started this test setting fixed flow temp to 50C but the heat pump capped out at 4kW (5:30-8:30pm). I remembered that I had set DIP switch SW8-1 to Energy saving mode over a year ago and had thought I had noticed this low capping before. The unit is quieter in energy saving mode which is also a nice benefit. It seems the energy saving output cap changes with outside temperature.
With SW8-1 back to Powerfull mode, the compressor immediately started ramping up ~8:30pm. It went all the way to 6.4 kW of heat output which was really a suprise, I have never seen it go so high before, but then I dont think I’ve ever tried to push it this high…
It sustained an average of 6.2 kW over an hour at peak!
Zooming in on the period, including the defrost at the end the average heat output was almost exactly 5kW and a COP of 3. Which to my surprise actually agrees almost exactly with the datasheet for these conditions…
The test was not really long enough to be that conclusive as it would have been good to have several defrosts and max output for the full duration. The time between defrosts of 2h seemed quite long. Im sure I’ve seen more often than that, perhaps the humidity was not quite high enough.
Will hopefully get more results over the coming week.