I am installing some used equipment for a walk-in cold box. Condenser is Manitowoc M#: CVD1075 that uses R-404A. The evap is a Russell M#: CTA 48-112 made for R22 use. I did some research and the condenser is designed to be used for ice making application according to manufacturer. Will this work? Should I use R22 or change out the TXV and use R-404A? I am concerned about using R22 because of the different oils. And no I didn't get the equipment the guys who built the box did.