I am having trouble understanding the allowable amount of refrigerant charge if I have multiple chillers and would like to pursue EA Credit 4. According to the reference guide, "Most projects have multiple units of base building NVAC&R equipment, but if each unit is compliant, the project as a whole meets the requirement." What happens if I have two units, only one of which is compliant on its own, but if the two units are averaged together, then they're compliant? Or, more simply, I am I allowed to use the average, or does one chiller with too much refrigerant charge make me ineligible for this credit?