I am working on a large project for which the cooling is predominantly from central chillers providing chilled water. This complies easily with the requirements of EAc4.

However, there are also split systems provided for standby cooling in the event that there should be some failure in the chilled water system. Do these back-up systems need to be included in the calculations? As they will not be at their working pressure, the leakage should be low and refrigerant pump down systems could be added if required to further reduce the leakage when they are not in use.

Many thanks