Haier HSU-18H03 User Manual - Page 7

Outdoor unit 6.Purging Method:To use vacuum pump Push the air out of the indoor unit and piping as followes: (1) Remove the valve cap on 2-way valve in outdoor unit. (2) Loosen by 1/2 turn the flare nut of gas pipe, which is conneted to 3-way valve. (3) Loosen 2-way valve by 90o using hexagon wrench, and after approx. 10 sec tighten it up. Gas comes out through flare nut on wide pipe. If no gas is discharged, tighten flare nut with specified torque. (4) Open 2-way and 3-way valves using specified torque. (5) Tighten the caps on the valves with specified torque. 2-way valve 3-way valve 9.52mm(3/8") 15.88mm(5/8") Tighten torque N.m Valve rod 7-9 Valve cap 20-25 When connecting pipe exceeds 5 meters, 60g refrigerant shall be added per exceeding meter. Charge according to the following list. Piping length Additional amount 5m No need 7m 120g 10m 300g Note: When extending piping, air inside piping shall be removed by using external refrigerant gas, charge according to the following list. Brand new outdoor unit is charged 80g more refrigerant than regulated weight. Only for first installation, this extra 80g can be used to purge air in pipes. During this procedure, 80g refrigerant will be discharged in piping. (This must be strictly controlled within 90o and 10 sec.) 7