Move the high side hose to test cock #4, low side to test cock #3 and open both test cock #3 and test cock #4. Remove vent hose from test cock #1, open shutoff #1.

• 将高端软管移到测试旋塞4号，低端软管移到测试旋塞3号，并开启测试旋塞3号和测试旋塞4号。从测试旋塞1号上拆卸排气软管，开启关闭阀1号。