Daikin FXDQ07MVJU Installation Manual

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Daikin FXDQ07MVJU Installation Manual Manual pdf 8 page image

7• When brazing the refrigerant piping, perform nitrogenreplacement first, or perform the brazing (CAUTION 2) whilefeeding nitrogen into the refrigerant piping (CAUTION 1), andfinally connect the indoor unit using the flare connections.(Refer to Fig. 9)CAUTION• When brazing a pipe while feeding nitrogen inside the pipe,make sure to set the nitrogen pressure to 29 psi or less usingthe pressure reducing valve.(This pressure is such that breeze is blown to your cheek.)Not recommendable but in case of emergencyYou must use a torque wrench but if you are obliged to install theunit without a torque wrench, you may follow the installationmethod mentioned below.After the work is finished, make sure to check that there isno gas leak.When you keep on tightening the flare nut with a spanner, thereis a point where the tightening torque suddenly increases. Fromthat position, further tighten the flare nut the angle shown below:Table 2DANGER• Use of oxygen could result in an explosion resulting in seri-ous injury or death. Only use nitrogen gas.• Refrigerant gas may produce toxic gas if it comes in contactwith fire such as from a fan heater, stove or cooking device.Exposure to this gas could cause severe injury or death.NOTE• Do not use flux when brazing refrigerant piping. Therefore,use the phosphor copper brazing filler metal (BCuP) whichdoes not require flux.(Flux has an extremely negative effect on refrigerant pipingsystems. For instance, if chlorine based flux is used, it willcause pipe corrosion. Flux containing fluorine will damagerefrigerant oil.)7. DRAIN PIPING WORKCAUTION• The connection opening on the drain piping may varydepending on the model, so check the model name and usethe right method for that model.• Make sure all water is out before making the duct connection.(1) Install the drain piping.• Make sure the drain works properly.• The diameter of the drain piping should be greater than orequal to the diameter of the connecting pipe (vinyl tube; pipesize : 25/32 in. ; outer dimension : 1-1/32 in.).(not including a riser)• Keep the drain piping short and sloping downwards at a gra-dient of at least 1/100 to prevent air pockets from forming.(Refer to Fig. 10)CAUTIONWater accumulating in the drain piping can cause thedrain to clog.• To keep the drain piping from sagging, space hangingbracket every 3 to 5 ft..• Use the drain hose (2) and the metal clamp (1). Insert thedrain hose (2) fully into the drain pipe connection hole andfirmly tighten the metal clamp (1) with the upper part of thetape on the hose end. Tighten the metal clamp (1) until thescrew head is less than 1/8 in. from the hose.(Refer to Fig. 11, 12)• The two areas below should be insulated because conden-sation may form there causing water to leak.• Drain piping passing indoors• Drain pipe connection holeReferring the figure below, insulate the metal clamp (1) anddrain hose (2) using the included large sealing pad (5).(Refer to Fig. 12)Pipe size (in.) Further tightening angle Recommended armlength of tool (in.)φ1/4 60 to 90 degrees Approx. 5-7/8φ3/8 60 to 90 degrees Approx. 7-7/8φ1/2 30 to 60 degrees Approx. 9-13/16φ5/8 30 to 60 degrees Approx. 11-13/16Refrigerant pipingPart to be brazed TapingPressure-reducing valvehandsvalve NitrogenNitrogenFig. 9Drain pipe connection holeRefrigerant pipesService drain hole(with rubber cap)4 in.or moreMain drain piping(with a slope of at least 1/100)Fig. 10