When the fluid circuit is at standstill.
问题描述：
When the fluid circuit is at standstill.
When the fluid circuit is at standstill,assuming correct configuration,the steam will not spread far enough down from the collector to reach the sensitive system components – and especially not the expansion tank.
谢1L，不过这跟电路没有关系，讲的是循环，热水器里的循环
答
当水流循环处于静止状态,假设的正确的配置状态,水流将不会向下充分扩展至触到敏感系统部件的收集器——尤其不会扩展到膨胀水箱.