Chigo CCB-12HR1 Technical Manual page 160

R410A50Hz Universal Outdoor Series Technical Manual Installation
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/cm2
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
GD Chigo Heating & Ventilation Equipment Co., Ltd.
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