I go on a no cooling call, find a 2 year old Rheem Split Heat Pump flat on charge. Dump in the nitro to find it will not hold any pressure at all. I go to the AHU and find the TXV Nut split open. Rheem will not warranty this because it is "Commercial" The AHU is a residential 3 ton AHU with a 3 Phase condenser. Replaced the coil, drier, vacuum and 9 lbs R410A. All working well for now.