Daikin FCQ24MVJU Installation Manual

Also see for FCQ24MVJU: Operation manual

Contents

Daikin FCQ24MVJU Installation Manual Manual pdf 9 page image

97-4 Brazing refrigerant piping• Before brazing local refrigerant pipe, nitrogen gas shall beblown through the pipe to expel air from the pipe.If your brazing is done without nitrogen gas blowing, a largeamount of oxide film develops inside the pipe, and couldcause system malfunction.• When brazing the refrigerant pipe, only begin brazing afterhaving carried out nitrogen substitution or while insertingnitrogen into the refrigerant pipe. Once this is done, connectthe indoor unit with a flared or a flanged connection.• Nitrogen should be set to 2.9psi. with a pressure-reducingvalve if brazing while inserting nitrogen into the pipe.DANGER• Use of oxygen may cause an explosion resulting in seriousinjury or death. Only use nitrogen gas.NOTE• Do not use flux when brazing refrigerant pipe. Therefore, usethe phosphor copper brazing filler metal (BCuP) which doesnot require flux.(Flux has an extremely negative effect on refrigerant pipingsystems. For instance, if chlorine based flux is used, it willcause pipe corrosion. If the flux contains fluorine, it willdamage the refrigerant oil.)8. DRAIN PIPING WORK〈〈〈〈〈〈〈〈Rig the drain pipe as shown below and take measuresagainst condensate. Improperly rigged pipe could lead toleak and eventually wet furniture and belongings.〉〉〉〉〉〉〉〉(1) Rig drain pipe• The diameter of the drain pipe should be greater than orequal to the diameter of the connecting pipe (vinyl tube; pipesize: 1 in.; outer dimension: 1 1/4 in.). (This does not apply torise.)• Keep the drain pipe short and sloping downwards at a gradi-ent of at least 1/100 to prevent air pockets from forming.• If the drain pipe cannot be sufficiently set on a slope,execute the drain raising pipe.• To keep the drain pipe from sagging, space hanging wiresevery 3.28 ~ 4.92ft .• Use the attached drain hose (1) and metal clamp (2).Insert the drain hose into the drain socket, up to the whitetape. Tighten the clamp until the screw head is less than3/16 in. from the hose.• Be sure to insulate the 2 below indicated spots.If uninsulated, there is always the possibility of conden-sate forming and leaking.• The drain pipe inside the building• Drain socket• Wrap the attached sealing pad (10) (Large) over the clampand drain hose to insulate, as shown in the drawing below.〈〈〈〈NOTE FOR DRAIN RAISING PIPE〉〉〉〉• Install the drain raising pipe at a height of less than 21 5/8 in..• Install the drain raising pipe at a right angle to the indoor unitand no more than 11 13/16 in. from the unit.NitrogenRefrigerantpipe Part to bebrazed TapingPressurereducing valvehandsvalveNitrogen3.28 - 4.92ft. 1/100 gradientor moreMetal clamp (2)Drain hose (1)Tape (White)(accessory)(accessory)Metal clamp (2)(accessory)Large sealing pad (10)(accessory)3/16 or less(length: in.)Adjustable(21 5/8 or less)Suspention bolt3.28-4.92ft.11 13/16 or lessClamp metal (2) (accessory)29 1/2 or less7 7/8Drain raising pipeRiseDrain hose (1) (accessory)Ceiling slab(length: in.)