Outdoor unit6.Purging Method:1.Remove the four screws of fresh air box from the back cover.2.Use six screws to fix fresh air box onto the designated position on the outdoor unit.3.Remove two screws of the pipe junction of the fresh air box, then insert the flared departure ofthe change for fresh air tube into the pipe junction and then fix with the screws.4.Use four screws to fix the fresh air box onto the back cover, as illustrated:Fresh air box Fresh airboxFresh air tubeFresh air tubeFresh air tubeScrewholeDustfiltrationmesh Screw ScrewJoint of tubeFlared departure5.Installation instruction on the outdoor part of the fresh air deviceBackcoverNote:After wiring, the connecting terminals of outdoor unit and change-fresh-air as well as the wiring sheath should beplaced in the change-for-fresh-air box against the rain.Connecting terminalFresh air signalwire(with guard ring)Change-for-fresh-air box73-way valve2-way valve6.35mm(1/4") 12.7mm(1/2")2-way valve6.35mm(1/4")3-way valve9.52mm(3/8")HSU-09C03/VA(ZXF)HSU-09H03/VA(ZXF)HSU-12C03/VA(ZXF)HSU-12H03/VA(ZXF)HSU-18C03/V(ZXF)HSU-18H03/V(ZXF)2-way valve9.52mm(3/8")3-way valve15.88mm(5/8")HSU-22C03/V(ZXF)HSU-22H03/V(ZXF)HSU-22C03/V(ZF)HSU-22H03/V(ZF)HSU-12H03/VB(ZXF)HSU-12H03/V(ZXF)HSU-24C03/V(ZXF)12.7mm(1/2")HSU-24C03/V(ZF)HSU-24H03/V(ZXF)HSU-24H03/V(ZF)HSU-24HK0307Note: 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 or 80g(22k,24k) more refrigerant than regulated weight. Only forfirst installation, this extra 50g or 80g(22k,24k) can be used to purge airin pipes.During this procedure, 50g or 80g(22k,24k) refrigerant will be discharged in piping.(This must bestrictly controlled within 90o and 10 sec.)When connecting pipe exceeds 5 meters, 20g or 60g(only for 22k24k) refrigerant shall be added per exceedingmeter. Charge according to the following list.Piping lengthAdditional amount5m 7mNo need 40g10m100gfor 9k 12k 18kPush the air out of the indoor unitand 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 isis 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 outthrough 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.Valve rodValve cap7-920-25Tighten torque N.mfor 22k 24kMax. Length: for 9K : A=7mfor 12K: A=10mfor 18K 22K 24K: A=20mMax.Elevation: for 9K 12K: B=5mfor 18K 22K 24K: B=10m5m 7mNo need 120g10m300g20m900gCOutdoor unitIndoor unit Outdoor unitIndoor unitOil trapABOutdoor unitIndoor unitABABCAUTIONIn case more than 5 metresˈoil trapshould be installed every 5~7m.CHSU-24HD0307