R3250Hz Universal Outdoor Series Technical Manual
GD Chigo Heating & Ventilation Equipment Co., Ltd.
②. Special vacuum dry procedure
This vacuum dry method is used in the following conditions:
There’s moisture when flushing the refrigerant pipe.
Rainwater may enter into the pipe.
Vacuum dry for the first time ······ 2h pumping
③. Vacuum destroy for the second time ······ Fill nitrogen to 0.5Kgf/cm
2
Because nitrogen is for drying gas, it has vacuum drying effect during vacuum destroy. But if the
moisture is too much, this method can’t dry thoroughly. So, please pay more attention to prevent water
entering and forming condensation water.
④. Vacuum dry for the second time······1h pumping
Determinant: Pass if achieving below -755mmHg. If -755mmHg can’t be achieved in 2h, repeat procedure
③ and ④.
⑤. Vacuum placing test ······ 1h
⑥. Sketch map of special vacuum dry procedure
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