Hey @anthony.schneider ,
Yea, I forgot that the VRF template uses a supply air temperature of 12.8 C for cooling the room so you would not be able to get the setpoint lower than that. But we should still be able to use the basic premise of your test with slightly less extreme setpoints like the following:
When I do this, I can see that the heating and cooling hours seem to mutually exclude one another:
… though, after a few days, the switching between heating and cooling seems to get the rooms to roughly be around their setpoints:
VRF Test_CWM.gh (91.1 KB)
But, yea. It looks like these particular VRFs are set up to be in only a single mode of operations and that cooling mode is given preference over heating mode. That’s why you have the heating setpoint not met for the first couple of days of the simulation.
Granted, there’s probably a way to edit the VRFs with either OpenStudio or the IDF Editor to get them to handle simultaneous heating/cooling. But, at that point, you’re getting a little bit beyond the knowledge on this forum and you might have better luck digging through the EnergyPlus Input/Output Reference or asking your question on UnmentHours.