Carrier 42PHQ Series Installation Manual

Contents

GB - 842PHQ ...PConnection to the unitInsufficient tightening torque will cause gas leaks.Overtightening the fittings will damage the tube flaring andcause gas leaks.Tubing diameter Torquemm (inches) Nm6.35 (1/4") 189.52 (3/8") 4212.70 (1/2") 55Once all connections have been completed, check for leaks byapplying soapy water to them.Finally wrap connections with anti-condensate insulation andtighten with tape, without exerting great pressure on theinsulation.Repair and cover any possible cracks in the insulation.Connection pipes and electric cables between indoor andoutdoor units must be fixed to the wall with appropriateconduits.Refer to the outdoor unit installation manual for tube sizing,and limitations (slope, length, number of bends allowed,refrigerant charge, etc.).For refrigerant tubes use seamless, insulated refrigeration gradetube, (Cu DHP type according to ISO1337), degreased anddeoxidized, suitable for operating pressures of at least 4200 kPaand for burst pressure of at least 20700 kPa.Under no circumstances must sanitary type copper pipe be used.Flaring the end of the tubingRemove protective caps from the copper tube ends.Position tube end downward, cut the tube to the required lengthand remove the burrs with a reamer.Remove flare nuts from the unit connections and place them onthe tube end.Flare the tube with the flaring tool.Flare end must not have any burrs or imperfections.The length of the flared walls must be uniform.Tubing diameterGas LiquidModel (Suction) (Discharge)mm (inches) mm (inches)007, 009 9.52 (3/8") 6.35 (1/4")012, 014, 018, 024 12.70 (1/2") 6.35 (1/4")Refrigerant connections Tube Tube insulation Fastening tape Adjustable wrench or torque wrench Outdoor end Indoor endLubricate the tube end and thread of the flare fitting with anti-freeze oil.Finger-tighten the fitting several turns, then tighten it fully withtwo wrenches by applying the tightening torque indicated in thetable.LL312456