Attempting to save money changing out a 19 year old 5 ton trane condensing unit and air handler with heat strip, I bought some 3 year old Lennox 5 ton equipment. The Condensor is a non-heat pump unit, scroll compressor and used with R22. The Air handler is a Lennox (CBX32MV) variable speed that was charged with 410 (Puron). I had an HVAC contractor over today to look over and bid on the installation and he isn't sure if R22 will work correctly with the coil/expansion valves in the air handler. The lennox manual for the air handler states that the internally mounted check/expansion valves are suitable for use in R410A applications, that leads me to think that they should also be compatible with R22? Has anyone had experience with this type of equipment change out before and if so were ther any problems my tech should be made aware of. He's kind of leaving the decision up to me and I have no clue. Thanks for your help.