To caluclate the Rc-value we need to know the amount of refrigerant and the cooliing capacity. As LEED v4 puts it:

Rc: Refrigerant Charge
(0.065 to 0.65 kg of refrigerant per kW of AHRI rated or Eurovent Certified cooling capacity)

Does this mean that the Rc value always must be between 0.065 and 0.65 kg/kW? For our cooling system we are using ammonia, which will have a Rc value of only 0.046 kg/kW, but all our larger refrigerator have an Rc value ranging between 0.95-2.1 kg/kW.

Does this mean that none of our refrigerants meets the requirements?

Best regards, Lise