Daikin M08B055 Installation Manual

Contents

Daikin M08B055 Installation Manual Manual pdf 7 page image

Refrigerant Piping Work1. 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 the pipe.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 unit life.3) Never use piping which has been used for previous installations. Only use parts which are provided with the unit.4) Do never install a refrigerant drier to this unit.5) The drying material may dissolve and damage the system.6) Incomplete or improper flaring may cause refrigerant gas leakage.WARNING2. Refrigerant piping.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 refrigeration oil for R410A.)3) Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.CAUTIONAlign the centers of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with the torque wrenches.Flare nut tightening torqueGas side Liquid side3/8 inch 1/4 inch24.1 - 29.4ft • Ibf(32.7 - 39.9N • m)10.4 - 12.7ft • Ibf(14.2 - 17.2N • m)2-1. Caution on piping handling1) 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 0.052 W/mK (0.024 to 0.030 Btu/fth˚F (0.035 to 0.045 kcal/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.Gas side Liquid side Gas pipe thermal insulation Liquid pipe thermal insulationO.D. 3/8 inch (9.5mm) O.D. 1/4 inch (6.4mm) I.D. 0.427 - 0.590 inch (12 - 15mm) I.D. 0.315 - 0.393 inch (8 - 10mm)Thickness 0.393 inch (8mm) Min.Thickness 0.031 inch (0.8mm) (C1220T-O)1-3/16 inch (30mm) or moreMinimum bend radius(Cut exactly atright angles.) Remove burrsCheckFlare’s innersurface mustbe flaw-free.The pipe end mustbe evenly flared ina perfect circle.Make sure that theflare nut is fitted.Set 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 toolDo not apply refrigerationoil to the outer surface.Flare nutApply refrigerationoil to the innersurface of the flare.Do not apply refrigerationoil to the flare nut avoidtightening with over torque.[Apply oil]Torque wrenchPiping unionFlare nutSpanner[Tighten]WallIf no flare cap isavailable, cover theflare mouth withtape to keep dirt orwater out.Be sure toplace a cap.RainGas pipe Liquid pipeGas pipeinsulationLiquid pipeinsulationFinishing tape Drain hoseInter-unit wiring

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