This disastrous situation must be avoided by design if the water side is exposed to the city water system because the collector loop eventually fills with water, and all freeze protection is lost.

• 这种很严重的状况，如果水侧暴露至城市系统，则必须通过设计避免，因为收集器回路最终会用水充满，且所有冻结保护都失去。