I replaced my current Heat Pump system that uses R-22 with new one that uses Puron (410A).
The system I got is :
Carrier 25HPA542 (preferred series) Heat pump
Carrier FE4 (infinity series) Air Handler
Carrier Infinity series Thermostat
I am using the existing lineset ( as it goes through finished basement etc). My contractor says that it is OK and he flushed it with Nitrogen. I have read that it needs to be flushed with R11 and Nitrogen, but he tells me that Carrier does not want R11 to be used and to flush only with Nitrogen, else the compressor warranty will be void.
Otherwise, the dealer was very easy to work with, except the confusion above.
Can someone help on what is the appropriate way to use the old lineset.