If crystallization occurs upon shutdown of a lithium bromide absorption system, what possible action should be taken?

In a lithium bromide absorption system, crystallization can occur when the concentration of lithium bromide becomes too high, especially when the system is not operating. The dilution cycle is a crucial process that helps to control the concentration of the lithium bromide solution. If this cycle is not functioning correctly, due to a malfunctioning timer or other issues, the concentration can increase to a level where crystallization occurs.

By checking the dilution cycle timer for correct operation, you ensure that the system is automatically adding water to dilute the lithium bromide solution when necessary. This action can help prevent crystallization by maintaining an optimal concentration in the system, thereby sustaining its operational integrity.

Other options, while relevant to system maintenance, do not directly address the issue of crystallization. For instance, checking the compressor's oil level pertains more to the mechanical aspects of a vapor-compression system and is not directly applicable to an absorption system. Inspecting the heat exchanger may be important for its efficiency but does not relate specifically to crystallization risks. Adjusting temperature settings could affect system performance but does not directly mitigate the crystallization problem associated with the lithium bromide solution. Therefore, ensuring that the dilution cycle is functioning properly is critical in preventing crystallization.