I'm pretty sure the 13 minimum came out in 2006 and the no more R-22 units came out in 2010 so there is a 4 year gap.
In 2006 Goodman started rating their air handlers for both R-410A and R-22 on the unit plate. I've noticed now that their air handlers are only rated for R-410A. My guess is after the law went into effect for R-410A they dropped the R-22 rating.
An engineer designs what he would never work on.
A technician works on what he would never design.
i always wonder if the flush really can help with the old R22 oil.
it happened once to me that even i replace the filter plus using the flush.
there is still some acid inside the unit.
No one said it wasn't a new air handler installed on an old R22 condenser. And now the old condenser died.
Originally Posted by 54regcab
Yes, you can do it. Just need to give it a good flushing.
Originally Posted by rebeltech