In an indirect expansion system, where is the coil containing the secondary refrigerant typically located?

In an indirect expansion system, the coil containing the secondary refrigerant is typically found in the air handler. This setup is designed to enhance the efficiency and flexibility of the cooling process. The secondary refrigerant, often water or a water-glycol mixture, circulates through the coil in the air handler, where it absorbs heat from the air that is being conditioned.

This indirect method allows for more efficient heat transfer as the secondary refrigerant can be chilled to a lower temperature than the primary refrigerant, helping to maintain optimal cooling in the system. By separating the evaporative process from the actual cooling medium, the system can better handle varying loads and provide consistent temperature control.

In contrast, other components like the compressor and the condenser serve different functional purposes in the cooling cycle and do not typically house the secondary refrigerant coils. The evaporator in an indirect expansion system is responsible for the primary refrigerant, rather than the secondary refrigerant used in this specific context. Thus, finding the coil containing the secondary refrigerant in the air handler aligns perfectly with the operating principles of an indirect expansion system.