Hi Richard,

Sounds like you are getting somewhere now. Even though 220grams may not sound like much from my experience it can make a difference. I would suggest adding it. Also I would suggest selecting the 'LONG' pipe setting on the outdoor PCB. It may help by ramping the compressor up a few extra Hz. Just remember it is more likely that a system will go into defrost more often in temp > 0 deg C as there is more moisture in the air than < 0 deg C. Also as oil return and defrost perform similar functions this should aid in ensuring the system runs at its optimum capacity at the duration of the 2 functions hence why you are getting better air 'OFF' temps.