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。
2
Circulating water pump inlet pipe and outlet pipe should also install pressure gauge.
循环水泵的进水管和出水管上也应装压力表。
3
Metallurgical oxygen system pipe system, should use strict degreasing treatment, needle valve flange J29 Angle Pressure Gauge valve connection.