I am working on a job that requires replacement of Kenmore condenser mod# CA9660VKA1(5 ton unit) due to burned compressor. Unit is about 12 years old. Air handler asociated with this unit is also kenmore NACA002MB04. I would like to find a little more info about these units. I think that the air handler is a fixed oriffice. My question is if I would want to replace the condenser only how am I gona match them up if I use different brand. Also my heat load calculation calls for a 4 ton unit. The ductwork in the house, especialy return is good for 4 ton. There was not enough air flow across the evaporator for 5 ton. I know that my best option is to replace air handler and condenser together. Any suggestion is appreciated.