I need some advice on if it is wise to flush and convert a relatively new coil from R22 to R410.
I replaced a leaking evaporator coil on June 27 with a new Lennox C33-60D that is housed in a SLP98V furnace. The system was recharged with with R22. Then, my 11-year old 5-ton Lennox HS21-060-1P died on September 13. So, the R22 charged C33 evaporator coil was in continuous service for 2.5 months. I'll be purchasing a Lennox XC14 or XC16. The C33 coil is a rated match to both of these systems.
I've talked with 5 contractors thus far, and 3 say flush the coil/lineset/replace TXV and 2 say replace the whole coil/lineset. All contractors have a long history in Kansas City and are highly regarded on Angie's list and all provide 10-year parts on the work. I've called Lennox and they say a coil flush will not void my warranty and is and accepted industry practice. Past opinions on flushing in this forum appear evenly divided.
What's the current professional opinion and experience with coil flushing? Is flushing a reasonable thing to do, given my coil is only 2 months old?