Haier HSM12HEK03 User Manual - Page 8

Outdoor unit 5.Purging Method: 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 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. Tighten torque N.m Valve rod 7-9 Valve cap 20-25 When connecting pipe exceeds 5 meters, 20g refrigerant shall be added per exceeding meter. Charge according to the following list. Piping length Additional amount for 9k 12k 5m 7m No need 40g 10m 100g 2-way valve 6.35mm(1/4") 3-way valve 9.52mm(3/8") Outdoor unit Indoor unit Outdoor unit Max. Length: 10m A Oil trap for 9K : A=7m for 12K : A=10m Indoor unit Max.Elevation:5m CAUTION In case more than 5m Oil trap shoud be installed every 5~7m no more gas if the length of connecting pipe is less than 7m(9K) or 10m(12K). The height difference between any two indoor or outdoor units can not be more than 5m. 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 50g more refrigerant than regulated weight. Only for first installation, this extra 50g can be used to purge air in pipes. During this procedure, 50g refrigerant will be discharged in piping. (This must be strictly controlled within 90o and 10 sec.) 7