When replacing the gauge on the high side of a refrigeration system, what should the pressure graduation rate be set to?

The appropriate pressure graduation rate for a gauge on the high side of a refrigeration system should be set to 1.2 times the design pressure. This setting is crucial for ensuring accurate readings and safe operation of the system. A gauge that is rated higher than the maximum working pressure of the system enables better precision in monitoring pressures, allowing for slight variations to be detected without the risk of the gauge exceeding its operational limits.

Setting the pressure graduation too low may lead to non-representative readings, making it difficult to assess the system's performance accurately. Conversely, setting it too high can compromise the visibility and responsiveness of the gauge, potentially leading to oversights in monitoring which could result in system inefficiencies or hazards.

1.2 times the design pressure provides a balance between sufficient range and operational safety, making it an optimal choice for accurate diagnostics and maintenance in refrigeration systems.