This is on a 3 year old Amana 3 ton TXV R410A HP system. The TXV crapped out this past week. A new TXV valve was installed at the AHU. The sub cooling is low by approximately 6 degrees, do you add refrigerant or adjust the TXV? The original refrigerant charge was pulled into the CU and re-used. The unit was working fine until the TXV crapped out. Much more detailed info can be provided, but I just would like a general answer in this case. This equipment is clean and like new. There are no issues with airflow, etc. I do not think it is worth wasting 220 oz of refrigerant to prove the refrigerant charge is 100% correct by recovering it and weighing in new. Do I add some refrigerant or tweek the TXV?
Thanks for any info.