I'm guessing water temp and Ambient wetbulb, but add some gas till you get closer to 10* sub cool across the condenser. Get me some low side temp readings and a wetbulb and we can judge the captube. Guessing a vapor temp of 70, wetbulb of 70, water of 100 would put the superheat around 22*, while a target of 10-15 would be better. At the moment it just sounds undercharged.
|