I have question regarding the use of an receiver in an air/water Heatpump.
I thought that you always needed one to make sure that you always have enough refrigerant depending on the running conditions.

There must be a big differnce in refrigerant flow (and the amount of refrigerant in the evaporator) depending on the outdoor temperature / evaporation temperature, this perticular heatpump is designed to be used from -20 to +40 degrees C.

And i found that someone had removed the reciever from the system.
So what happends at low temperatures when the flow is lower?
Or are my thoughts regarding all this wrong?