Refrigerant charge of multi-split type air conditioner

 We have the following usual operating pressures average for nominal conditions.

Low (psig)                   High (psig)

   70 - 85                       290 -310

  We emphasize that it is imperative to calculate the superheat and subcooling to adjust the gas load and obtain the maximum performance of the equipment.

Never charge refrigerant in liquid form from the low pressure side of the system.