Close valve C. Open valve A, then open valve B 1.2 turn, loosen hose at test cock #4 to remove air. Retighten hose.

• 关闭阀门C。开启阀门A，然后将阀门B开启1.；2圈，松开测试旋塞4号上的软管排出空气。重新紧固软管。