Worked on a York H2A360A46D split system this morning. It cools a church and the 1/4" copper for the remote suction service valve had cracked. The unit is above the evaporator. The unit was not flat, and still running, just not cooling properly. I repaired the crack and put in 60lbs of 22. All I had on my truck. The unit still isnt completly charged.
It has a 100lb receiver that was field installed between the liquid line service valve and the drier on the exterior of the unit. The unit has 1 1/8" liquid line and 2 1/8" suction line. The lines are maybe a 75' run. I would guess the reason that the receiver was installed was to aid in pumpdown. The condensor would never hold all the refrigerant.
But when there is a leak we are talking about perhaps as much as 100 lbs of extra refrigerant to charge this unit up. The drier is a 2 core 48 series replaecable core that has field installed valves on each side, and can be isolated.
What are thoughts about removing this huge receiver and using recovery tanks to hold refrigerant if the unit ever needs to be pumped down in the future. Or if a leak developes on the high side it will need to be evacuated anyway.