Carrier 42 HWS 07 Installation Manual

Contents

42 HWSGB - 8Refer to the outdoor unit installation manual for tube sizing,and limitations (slopes, length, number of curves allowed,refrigerant charge, etc.)Tubing diameterGas LiquidMod. (Suction) (Discharge)mm (inches) mm (inches)07 10 (3/8") 6 (1/4")09 10 (3/8") 6 (1/4")12 12 (1/2") 6 (1/4")18 12 (1/2") 6 (1/4")24 16 (5/8") 6 (1/4")For refrigerant tubes use seamless, insulated refrigeration grade tube,(Cu DHP type according to ISO 1337), degreased and deoxidized, suitablefor operating pressures of at least 3000 kPa. Under no circumstances usesanitary type copper pipe.Flaring the end of the tubingRemove protective caps from the copper tube ends. Position tubeend downward, cut the tube to the required length and remove theburrs with a reamer.Remove flare nuts from the unit connections and place them on thetube 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.Lubricate the tube end and thread of the flare fitting with anti-freezeoil. Finger-tighten the fitting several turns, then tighten it fully withtwo wrenches by applying the tightening torque indicated in thetable.Connection to the unitInsufficient tightening torque will cause gas leaks. Overtighteningthe fittings will damage the tube flaring and cause gas leaks.Tubing diameter Torquemm (inches) Nm6 (1/4") 15 - 2010 (3/8") 31 - 3512 (1/2") 50 - 5516 (5/8") 50 - 55Once all connections have been completed, check for leaks byapplying soapy water to them. Finally wrap connections with anti-condensate insulation and tighten with tape, without exerting greatpressure on the insulation. Repair and cover any possible cracks inthe insulation. Connection pipes and electric cables between indoorand outdoor units must be fixed to the wall with appropriateconduits. If the system power supply is connected to the indoor unit(only for models 07 - 09 and 12) the power supply cable must alsobe fixed to the wall in the proper conduit.CheckPour water into the condensate drain pan and check that it flowsfreely to the drain.Refrigerant connections Tube Tube insulation Fastening tape Adjustable wrench or torque wrench Outdoor end Indoor endLL