Daikin M08B128 Installation Manual

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Contents

Daikin M08B128 Installation Manual Manual pdf 7 page image

Align the centers of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fullywith the torque wrenches.Refrigerant Piping Work2. Refrigerant piping.2-1. Caution on piping handling.1) Protect the open end of the pipe against dust and moisture.2) All pipe bends should be as gentle as possible. Use a pipe bender for bending.2-2. Selection of copper and heat insulation materials.• When using commercial copper pipes and fittings, observe the following:1) Insulation material: Polyethylene foamHeat transfer rate: 0.041 to 0.052W/mK (0.024-0.030Btu/fth˚F (0.035-0.045kcal/mh˚C))Refrigerant gas pipe’s surface temperature reaches 230˚F (110˚C) max.Choose heat insulation materials that will withstand this temperature.2) Be sure to insulate both the gas and liquid piping and to provideinsulation dimensions as below.3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.Flare nut tightening torqueGas side Liquid side45.6-55.6ft lbf(61.8-75.4N m)24.1-29.4ft lbf(32.7-39.9N m)5/8 inch (15.9mm) 3/8 inch (9.5mm)1) Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)2) To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigerationoil for R410A.)3) Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.CAUTION1. Flaring the pipe end.1) Cut the pipe end with a pipe cutter.2) Remove burrs with the cut surface facingdownward so that the chips do not enter thepipe.3) Put the flare nut on the pipe.4) Flare the pipe.5) Check that the flaring is properly made.1) Do not use mineral oil on flared part.2) Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.3) Never use piping which has been used for previous installations. Only use parts which are deliveredwith the unit.4) Never install a drier to this R410A unit in order to guarantee it’s lifetime.5) The drying material may dissolve and damage the system.6) Incomplete flaring may cause refrigerant gas leakage.WARNINGGas pipe thermal insulationLiquid sideGas side Liquid pipe thermal insulationI.D. 0.630-0.787 inch (16-20mm)O.D. 3/8inch (9.5mm)O.D. 5/8 inch (15.9mm) I.D. 0.472-0.591 inch (12-15mm)Minimum bend radius Thickness 0.393 inch (10mm) Min.1-3/16 inch (30mm) or more1-15/16 inch (50mm) or moreThickness 0.031 inch (0.8mm) (C1220T-O)Thickness 0.039 inch (1mm) (C1220T-O)WallIf no flare cap isavailable, cover theflare mouth withtape to keep dirt orwater out.Be sure toplace a cap.RainGas pipeLiquid pipeGas pipeinsulation Liquid pipeinsulationFinishing tape Drain hoseInter-unit wiringTorque wrenchPiping unionFlare nutDo not apply refrigerationoil to the outer surface.Flare nutApply refrigeration oil to theinner surface of the flare.Do not apply refrigeration oil to the flarenut to avoid tightening with over torque.Spanner[Apply oil] [Tighten](Cut exactly atright angles.) Remove burrsSet exactly at the position shown below.AFlaringDie A 0-0.020 inch (0-0.5mm)Clutch-typeFlare tool for R410A0.039-0.059 inch (1.0-1.5mm)Clutch-type (Rigid-type)0.059-0.079 inch (1.5-2.0mm)Wing-nut type (Imperial-type)Conventional flare toolCheckFlare’s innersurface mustbe flaw-free.The pipe end mustbe evenly flared ina perfect circle.Make sure that theflare nut is fitted.

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