Refrigerant is added to the centrifugal machine through the?

In a centrifugal chiller, refrigerant is typically added through the evaporator charging valve. This is the correct method because the evaporator is where the refrigerant absorbs heat from the water circulating through the system, changing from a liquid to a gas. By adding refrigerant at this point, it allows for better control and management of the refrigeration cycle, ensuring that the system runs efficiently.

The evaporator charging valve is designed to accommodate the specific requirements for handling refrigerant in its gaseous and liquid states, facilitating the proper mixing and flow within the system. Therefore, adding refrigerant there can help maintain the necessary pressure and temperature conditions required for optimal operation.

Other components like the float valve, compressor service valve, and condenser charging valve serve distinct functions. The float valve regulates the liquid refrigerant level in the evaporator, while the compressor service valve allows for servicing the compressor itself. Meanwhile, the condenser charging valve is typically associated with adding refrigerant to the condenser side, which is not where the addition is usually performed for maintaining the circuit during operation.