Recently we had a new York furnace and evaporator coil (with txv) installed to replace aging units. We had it installed when it was still quite cold outside and I have a question regarding the freon R22 charge which was set after the coil was installed. The tech simply checked the charge by adjusting it to suction 65psi. I feel he should have set the charge by using the subcool method. I believe the outside temperature on the installation day was about 60 degrees. Should I insist that they come back to recheck the charge or is their "rule of thumb" method really good enough and to be trusted/accepted? The 65 degrees suction pressure is approx. 38 degrees at the evap coil, but is the system going to perform as it should?
Thanks for your input!