将真空泵连于复合压力表，打开复合压力表和真空泵对室内机和连接管抽真空。
Unscrew the nut from the service connection of suction line valve and connect the compound pressure gauge.
将真空泵连于复合压力表，打开复合压力表和真空泵对室内机和连接管抽真空。
Connect the vacuum pump to the compound pressure gauge; open the compound pressure gauge and vacuum pump to vacuum the indoor unit and connecting pipe.
进口持压泄压阀由主阀、泄压/持压导阀针阀、 、 球阀、微形过滤器和压力表组成水力控制接管系统。
A pressure relief valve from the main valve, pressure relief / holding pressure pilot valve needle valve, ball valve, micro shaped filter and pressure gauge hydraulic control over the system.
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