Daikin FXMQ30MVJU Installation Manual

Also see for FXMQ30MVJU: Serivce manual Serveice manual Service manual Design, Installation & Testing Instruction Operation manual

Contents

Daikin FXMQ30MVJU Installation Manual Manual pdf 8 page image

76-4 Brazing referigerant piping• Before brazing local refrigerant piping, nitrogen gas shall beblown through the piping to expel air from the piping.If your brazing is done without nitrogen gas blowing, a largeamount of oxide film develops inside the piping, and couldcause system malfunction.• When brazing the refrigerant piping, only begin brazing afterhaving carried out nitrogen substitution or while insertingnitrogen into the refrigerant piping. Once this is done, con-nect the 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 piping.NOTEDo not use flux when brazing refrigerant piping. Therefore,use the phosphor copper brazing filter metal (BCuP) whichdoes not require flux.(Flux has extremely harmful infulence on refrigerant pipingsysems. For instance, if the chlorine based flux is used, itwill cause pipe corrosion or, in particular, if the flux containsfluorine, it will damage the refrigerant oil.)7. DRAIN PIPING WORK〈〈Rig the drain pipe as shown below and take measuresagainst condensation. Improperly rigged piping could leadto leaks and eventually wet furniture and belongings.〉〉〈〈Insulate the drain piping inside the building.〉〉(1) Carry out the drain piping.• Keep piping as short as possible and slope it downwardsso that air may not remain trapped inside the pipe.• Keep pipe size equal to or greater than that of the con-necting pipe (Vinyl pipe of 1 “ nominal diam. and 1 1/4”outer diam.).• Use the attached drain hose and clamp.Tighten the clamp firmly.• Insulate the metal clamp with the sealing pad.• There is negative pressure inside the unit relative to atmo-spheric pressure when the unit is running, so be sure toprovide condensate trap on the condensate outlet. (Seethe figure)• In order to prevent foreign matter from building upinside the piping, you should avoid curves as muchas possible, and arrange so the trap can be cleaned.NOTE• If converging multiple drain pipes, install according to the pro-cedure shown below. (Install a condensate trap for eachindoor unit.)(2) After piping work is finished, check drainage flowssmoothly.• Add approximately 61in3of water slowly from the air inletand check drainage flow.NOTE• Drain piping connectionsDo not connect the drain piping directly to sewage pipes thatsmell of ammonia. The ammonia in the sewage might enterthe indoor unit through the drain pipes and corrode the heatexchanger.8. ELECTRIC WIRING WORK8-1 GENERAL INSTRUCTIONS• All field supplied parts and materials and electric works mustconform to local codes.• Use copper wire only.• For electric wiring work, refer to also “Wiring diagram label”attached to the electric parts box lid.• For remote controller wiring details, refer to the installationmanual attached to the remote controller.• All wiring must be performed by an authorized electrician.• This system consists of multiple indoor units. Mark eachindoor unit as unit A, unit B..., and be sure the terminal boardwiring to the outdoor unit and BS unit are properly matched.If wiring and piping between the outdoor unit and an indoorunit are mismatched, the system may cause a malfunction.• A circuit breaker capable of shutting down power supply tothe entire system must be installed.• Refer to the installation manual attached to the outdoor unitfor the size of power supply wiring connected to the outdoorunit, the capacity of the circuit breaker and switch, and wiringinstructions.• Be sure to ground the air conditioner.• Do not connect the ground wire to gas and water pipes, light-ning rods, or telephone ground wires.