Daikin FXDQ07MVJU Installation Manual

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Daikin FXDQ07MVJU Installation Manual Manual pdf 7 page image

6(4) Tighten the upper nut.6. REFRIGERANT PIPING WORK〈For refrigerant piping of outdoor units, see the installationmanual attached to the outdoor unit.〉〈Execute heat insulation work completely on both sides ofthe gas piping and the liquid piping. Otherwise, a waterleakage can result sometimes.Use insulation that can withstand temperatures of at least250°F. Reinforce the insulation on the refrigerant pipingaccording to the installation environment. If the temperatureabove the ceiling might reach 86°F or the humidity RH80%.Condensation may form on the surface of the insulation.〉CAUTIONFollow the points at below.• Use a pipe cutter and flare suitable for the type of refrigerant.• Apply ester oil or ether oil to the flare section when using aflare connection.• Only use the flare nuts included with the unit. Using differentflare nuts may cause the refrigerant to leak.• To prevent dust, moisture or other foreign matter from infil-trating the piping, either pinch the end or cover it with tape.• Do not allow anything other than the designated refrigerant toget mixed into the refrigerant circuit, such as air, etc. If anyrefrigerant gas leaks while working on the unit, ventilate theroom thoroughly right away.(1) Connect the piping.• The outdoor unit is charged with refrigerant.• Be sure to use both a spanner and torque wrench together,as shown in the drawing, when connecting or disconnectingpipes to/from the unit. (Refer to Fig. 6)• Refer to the Table 1 for the dimensions of flare nut spaces.• Apply ester oil or ether oil to flare section (both inside andout) when using flare nut connections and then turn 3 or 4times by hand. (Refer to Fig. 7)• Refer to Table 1 for tightening torque.Table 1CAUTIONOvertightening may damage the flare and cause leaks.Be careful for oil not to adhere to any portions other thana flare part. If oil adhere to resin parts etc., there is a pos-sibility of damaging by deterioration.• Refer to Table 2 if no torque wrench is available.Using a wrench to tighten flare nuts causes the tighteningtorque to suddenly grow much tighter after a certain point.From there, tighten the nut further by the appropriate anglelisted in Table 2.(2) After the work is finished, make sure to check thatthere is no gas leak.(3) After checking for gas leaks, be sure to insulate thepipe connections referring to Fig. 8.• Insulate using the insulation for fitting (3) (4) included withthe liquid and gas pipes. Besides, make sure the insula-tion for fitting (3) (4) on the liquid and gas piping has itsseams facing up.(Tighten both edges with clamp (9).)• For the gas piping, wrap the mid. sealing pad (6) over theinsulation for fitting (4) (flare nut part).CAUTIONBe sure to insulate any field piping all the way to the pipingconnection inside the unit. Any exposed piping may causecondensation or burns if touched.Vinyl tubeLevelTorque wrenchSpannerEster oil or ether oilPiping unionFlare nutFig. 6 Fig. 7Pipe size(in.)Tightening torque(ft.lbf)Flare dimensions A(in.) Flare shape (in.)φ1/4 10.4–12.7 0.342–0.358φ3/8 24.1–29.4 0.504–0.520φ1/2 36.5–44.5 0.638–0.654φ5/8 45.6–55.6 0.760–0.776R0.016-0.031A90˚± 2˚45˚±2˚Gas pipePiping insulationmaterial (main unit)Attach to baseFlare nut connectionTurn seams upMid. sealing pad (6) (accessory)Insulation for fitting (4) (accessory)Gas Piping Insulation ProcedureLiquid Piping Insulation Procedure(accessory)Clamp (9) Piping insulation material(Field supply)Clamp (9) (accessory)Flare nut connectionTurn seams upPiping insulation material(Field supply)Piping insulation material(main unit)Attach to baseMain unitFig. 8Liquid pipeInsulation for fitting (3) (accessory)Wrap over the top ofthe flare nut connection.Main unit