Rheem 5 ton a/c condenser - small pin hole leak
I have a Rheem 5 ton residential a/c condenser unit that sits outside the house.
This unit and all the similar ones in this neighborhood are approximately 19-20 years old.
This type of a/c condenser uses standard R-22 type freon.
I had this unit charged up with approximately six pounds of R-22 freon. This was done in July 2009. When rheem 5 ton was checked in the past three weeks (early May 2012). The Rheem 5 ton condenser was empty..
It did not need to have any freon added in 2010, nor 2011. This unit is usually used between May 15 - September 30.
Does anyone know of solutions to solve this problem.
What do you recommend or do not recommend.
Thanks for any advice.