Daikin FBQ50D2VEB Installation Manual

Also see for FBQ100D2VEB: Service manual Service manual

Contents

Daikin FBQ50D2VEB Installation Manual Manual pdf 7 page image

4Refrigerant piping workFor refrigerant piping of outdoor unit, refer to the installation manualsupplied with the outdoor unit.Execute heat insulation work completely on both sides of the gaspiping and the liquid piping. Otherwise, this can sometimes result inwater leakage.Before rigging tubes, check which type of refrigerant is used. Use a pipe cutter and flare suitable for the used refrigerant. To prevent dust, moisture or other foreign matter from infiltratingthe tube, either pinch the end, or cover it with tape. Use copper alloy seamless pipes (ISO 1337). The outdoor unit is charged with refrigerant. To prevent water leakage, execute heat insulation workcompletely on both sides of the gas and liquid piping. Whenusing a heat pump, the temperature of the gas piping can reachup to approximately 120°C, use insulation which is sufficientlyheat resistant. Be sure to use both a spanner and torque wrench together whenconnecting or disconnecting pipes to/from the unit. Do not mix anything other than the specified refrigerant, such asair, etc..., inside the refrigerant circuit. Use annealed material only for flare connections. Refer to Table 1 for the dimensions of flare nut spaces and theappropriate tightening torque. (Overtightening may damage theflare and cause leaks.)Table 1 When connecting the flare nut, coat the flare inner surface withether oil or ester oil and initially tighten 3 or 4 turns by handbefore tightening firmly. If the refrigerant gas leaks during the work, ventilate the area. Atoxic gas is emitted by the refrigerant gas being exposed to a fire. Make sure there is no refrigerant gas leak. A toxic gas may bereleased by the refrigerant gas leaking indoor and beingexposed to flames from an area heater, cooking stove, etc. Finally, insulate as shown in the figures below.Piping insulation procedureCautions for brazing Be sure to carry out a nitrogen blow when brazing.Brazing without carrying out nitrogen replacement or releasingnitrogen into the piping will create large quantities of oxidizedfilm on the inside of the pipes, adversely affecting valves andcompressors in the refrigerating system and preventing normaloperation. When brazing while inserting nitrogen into the piping, nitrogenmust be set to 0.02 MPa with a pressure-reducing valve (=justenough so that it can be felt on the skin).Installation shall be done by a licensed refrigerationtechnician, the choice of materials and installation shallcomply with the applicable national and internationalcodes. In Europe, EN378 is the applicable standard thatshall be used.1 Torque wrench2 Spanner3 Piping union4 Flare nutPipegaugeTightening torque(N•m)Flare dimensionA (mm) Flare shapeØ6.4 15~17 8.7~9.1Ø9.5 33~39 12.8~13.2Ø12.7 50~60 16.2~16.6Ø15.9 63~75 19.3~19.71 243R0.4~0.845°±290°±2AGas piping Liquid piping1 Piping insulation material (field supply)2 Flare nut connection3 Insulation for fitting (delivered with the unit)4 Piping insulation material (main unit)5 Main unit6 Clamp (field supply)7 Medium 1 sealing pad for gas piping (delivered with the unit)Medium 2 sealing pad for liquid piping (delivered with the unit)A Turn seams upB Attach to baseC Tighten the part other than the piping insulation materialD Wrap over from the base of the unit to the top of the flare nutconnectionFor local insulation, be sure to insulate local piping allthe way into the pipe connections inside the unit.Exposed piping may cause condensation or maycause burns when touched.1 Refrigerant piping2 Part to be brazed3 Taping4 Hands valve5 Pressure-reducing valve6 NitrogenA BDC71 23 4 56 6A BC1 23 4 56 6D71 2 3 4 566