I have a YKNBMCHO-CPC that I am going to be starting up soon. This is a "C" style machine, using control panel #371-01200-004. It is a cooling only machine, Non-VSD/VGD, with a fixed orifice.Just finished the overhaul and pumped about 900 pounds into machine. Charge is R134a, and this is the amount I pulled.
The original start up tech did not log the start up evap approach or amount of charge on the unit and I have consulted 160.49-01. and according to the shell code chart, I should have 1905 lbs of R134a. This is only a 450 ton machine. I did consult 160.49-02, on a whim, and the same shell codes call for 1650 pounds of charge. Both pertaining to a "C" style machine. I lend more credence to 160.49-01 due to the age of the machine (1994), even though both manuals state that they cover the numbers on the dates. the only difference is the panel#.
I will check sight glasss levels after start up and charge by approach, but can these shell charges be accurate? seems awfully high. any input is appreciated.