Daikin R-410A Installation Manual

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Daikin R-410A Installation Manual Manual pdf 30 page image

Installation EDUS39-60529 Installation of Outdoor Units• After all the piping has been connected, use nitrogen toperform a gas leak check.Not recommended but in case of emergencyYou must use a torque wrench but if you are obliged to installthe unit without a torque wrench, you may follow the installa-tion method mentioned below.After the work is finished, make sure tocheck that there is no gas leak.When you keep on tightening the flare nut with a spanner,thereis a point where the tightening torque suddenlyincreases. From that position, further tighten the flare nutthe angle shown below:Disposal requirementsDismantling of the unit, and treatment of the refrigerant,oil and eventual parts, should be done in accordance withthe relevant local and national regulations.6-5 Pipe insulationAfter finishing the leak test and vacuum drying, the pip-ing must be insulated. Take into account the followingpoints:• Make sure to insulate the connection piping and refrigerantbranch kits entirely.• Be sure to insulate the liquid-side and gas-side piping forthe inter-unit piping and the refrigerant branch kits. For mul-tiple outdoor units, always insulate the oil pressure equal-izer.Not insulating them may cause leaking. The gas piping canreach temperatures of 248°F. Be sure the insulation usedcan withstand such temperatures.• If you think the humidity around the cooling piping mightexceed 86°F and RH80%, reinforce the insulation on thecooling piping ensuring it is at least 13/16” thick. Conden-sation might form on the surface of the insulation.• If there is a possibility that condensation on the shut-offvalve might drip down into the indoor unit through gaps inthe insulation and piping because the outdoor unit islocated higher than the indoor unit, etc., this must be pre-vented by corking the connections, etc.Refer to figure 11.1. Liquid line stop valve2. Gas line stop valve3. Outer-to-inner interconnecting piping4. Calking treatment, etc.5. Heat insulator6. Oil-equalizing line stop valveWARNINGBe sure to insulate local pipes, as touching them can causeburns.6-6 Additional refrigerant chargeWARNING• 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.NOTERefrigerant cannot be charged until field wiring has beencompleted.Refrigerant may only be charged after performing the leaktest and the vacuum drying.When charging a system, care shall be taken that its max-imum permissible charge is never exceededto prevent thedanger of liquid hammer.Refrigerant containers should be opened slowly.TO AVOID COMPRESSOR BREAKDOWN. DO NOTCHARGE THE REFRIGERANT MORE THAN THE SPEC-IFED AMOUNT TO RAISE THE CONDENSING PRESSURE.• 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 and normal systemoperation would no longer be assured.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 tightening angle Recommended arm length of tool3/8” 60 to 90 degrees Approx. 7-7/8”1/2” 30 to 60 degrees Approx. 9-13/16”5/8” 30 to 60 degrees Approx. 11-13/16”R=0.016-0.03145 ±290 ±2A