Ok I have a Singer M:207C TXV for R-12 (Same as the american Control company TXV) it comes preset to 9F (-12C) superheat.

It is a 6,000BTU/hr unit (1.76 KW/hr) liquid cross charged head internaly equilized


I'm thinking I need to set the super heat higher for it to work correctly with R-134a correct?

Thanks guys for any Help.

Head pressure during pull down is 150PSI