How can you do it? If you have one evaporator and you try to put it in to hot gas defrost where are getting a refrigerating load to produce hot gas from if your only evaporator is being defrosted?

Or did i read this wrong are you trying to make a hot gas bypas to the evaporator in order to keep the SST above freezing??

I guess I'm not totally understanding the application, first post on here bare with me, lol
-Mike