To ensure the efficient and stable operation of the heat pump system, we conduct vacuuming to prevent residual air from negatively affecting performance and to avoid moisture and non-condensable gases from entering the system. We use the high-performance Baolai Roots pump set, ensuring that the vacuum level is strictly controlled below 10 Pa and that the vacuum is maintained for more than 5 minutes. This process guarantees the cleanliness of the system's interior, providing a strong foundation for the system's normal operation.