From using different brands for cold rooms projects: We found Copeland ZSI compressor had good thermal protector than Danfoss.when return gas is not good,the compressor motor is very hot,the thermal protector will stop compressor and avoid burn compressor.but Danfoss thermal protector is not good.its easy to burn compressor when return gas is not good.
Please note:When the temperature come to -10C and going to -18C,you will find the temperature come down slow.please adjust expansion valve small.the temperature will come down fast.this is the differnce. If you have any different opinion,welcome to share your experience