Daikin R-410A Installation Manual

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Daikin R-410A Installation Manual Manual pdf 52 page image

Installation EDUS39-60551 Installation of Outdoor UnitsFLARE SHAPE and FLARENUT TIGHTENING TORQUEPrecautions when connecting pipes:• When connecting the flare nuts, apply refrigerant oil to theinside and outside of the flares and turn them three or fourtimes at first. (Use ester oil or ether oil.)• See the following table for tightening torque.(Applying too much torque may cause the flares to crack.)• After all the piping has been connected, use nitrogen toperform a gas leak check.• See the following table for flare machining dimensions:Not recommended but in case of emergency: You mustuse a torque wrench but if one is not available, use the fol-lowing installation method:When tightening the flare nut with a spanner, there is a pointwhere the tightening torque suddenly increases. From thatposition, further tighten the flare nut the angle shown below:(in.)After the work is finished, ensure there is no gas leak.Disposal requirementsDismantling the unit and treatment of the refrigerant, oil, andother parts, must be done in accordance with the relevantlocal and national regulations.Pipe insulationAfter finishing the leak test and vacuum drying, the pipingmust be insulated. Take into account the following points:• Be sure to thoroughly insulate the connection piping andrefrigerant branch kits.• Be sure to insulate the liquidside, suction gasside and dis-charge gasside piping for the inter-unit piping and therefrigerant branch kits. For multiple outdoor units, alwaysinsulate the oil pressure equalizer.Not insulating piping can cause leaking. The gas pipingcan reach temperatures of 250°F so ensure the insulationused can withstand such temperatures.• If you think the humidity around the cooling piping mightexceed 86°F and RH80%, reinforce the insulation on thecooling piping using insulation at least 13/16” thick. Con-densation may form on the surface of the insulation.• Any possibility that condensation on the stop valve mightdrip down into the indoor unit through gaps in the insulationand piping because the outdoor unit is located higher thanthe indoor unit, must be prevented by measures such ascaulking the connections. .(Refer to figure 11, page 38)1. Liquid line stop valve2. Suction gas line stop valve3. Discharge gas line stop valve4. Outer-to-inner interconnecting piping5. Caulking treatment6. Heat insulator7. Oil-equalizing line stop valve8. Oil-equalizing lineCAUTION• Be sure to insulate local pipes, as touching them cancause burns.Additional refrigerant chargeCAUTION• To avoid injury, always use protective gloves and eye pro-tection when charging refrigerant.• To avoid injury, do not charge with unsuitable substances.Use only the appropriate refrigerant.NOTE• Refrigerant cannot be charged until field wiring has beencompleted.• Refrigerant may only be charged after performing theLeak test and the vacuum drying, Section 6-4.• Prevent liquid slugging by never exceeded the maxi-mum permissable charge when charging a system.• Refrigerant containers must be opened slowly.TO AVOID COMPRESSOR BREAKDOWN, DO NOTCHARGE THE REFRIGERANT MORE THAN THE SPECI-FIED AMOUNT FOR RAISING THE CONDENSING PRES-SURE.• This outdoor unit is factory charged with refrigerant anddepending on pipe sizes and pipe lengths some systemsrequire additional charging of refrigerant.• Charge the refrigerant to the liquid pipe in its liquid state.Since R-410A is a mixed refrigerant, its compositionchanges if charged in a state of gas. To ensure normal sys-tem operation, the refrgerant must be charged in its liquidstate to the liquid pipe.• Before filling, check if the tank has a siphon attached.How to fill a tank with a siphon attached:Other ways of filling the tank• Determine the amount of refrigerant to be added by refer-ring to the table, write it on the included “Added Refriger-ant” plate and attach it to the rear side of the front cover.Note: refer to the example of connection for the amount tobe added.pipe size(in.)tighteningtorque (ft.-Ibf) A (in.) flare shape (in.)φ3/8” 24.1 - 29.4 0.504 - 0.520φ1/2” 36.5 - 44.5 0.638 - 0.654φ5/8” 45.6 - 55.6 0.760 - 0.776Pipe size Further tighteningangleRecommended arm length oftoolφ3/8” 60 to 90 degrees Approx. 7-7/8φ1/2” 30 to 60 degrees Approx. 9-13/16φ5/8” 30 to 60 degrees Approx. 11-13/16φ3/4” 20 to 35 degrees Approx. 17-3/4R=0.016-0.03145 ±290 ±2AThere is a siphon tubeinside, so there is no needto turn the tank upside-down.Fill with the tank upright.There is a siphon tubeinside, so there is no needto turn the tank upside-down.Fill with the tank upright.