Additional Refrigerant Charge - Chigo CCB-12HR1 Technical Manual

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/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

3.Additional Refrigerant Charge

Caution
● Refrigerant cannot be charged until field wiring has been completed.
● Refrigerant may only be charged after performing the leak test and the vacuum pumping.
● When charging a system, care shall be taken that its maximum permissible charge is never
exceeded, in view of the danger of liquid hammer.
● Charging with an unsuitable substance may cause explosions and accidents, so always ensure
that the appropriate refrigerant is charged.
GD Chigo Heating & Ventilation Equipment Co., Ltd.
144