To ensure the stable operation of air conditioning equipment, reduce the cost of fault maintenance, and help technicians standardize the replacement of common accessories, this guide is specially compiled. The guide covers the recognition of core air conditioning accessories, the standardized replacement process of 6 key components, required tools and safety precautions, and is suitable for professional maintenance personnel and relevant personnel with basic electrical operation capabilities for reference.

The core is to calculate the required heat dissipation and reserve a margin based on the total heat generation of internal cabinet equipment and the maximum temperature difference inside and outside the cabinet, so as to select a suitable model. Additionally, consider the protection level (IP55 or above recommended), installation method and power supply system (commonly -48VDC), and decide whether to add a heating function based on the environment. Remote monitoring (e.g., RS485 Modbus interface) and comprehensive alarm functions are crucial for unattended stations.