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.
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。
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