Carrier 40KQM012 Installation Manual

Contents

GB - 940KQME N G L I S HIMPORTANT:During the unit installation make first refrigerant connectionsand then electrical connections. If unit is uninstalled firstdisconnect electrical cables, then refrigerant connections.Refer to the outdoor unit installation manual for tube sizing,and limitations (slope, length, number of curves allowed,refrigerant charge, etc.).Tube diameterGas LiquidMod. (suction line) (discharge line)mm (inches) mm (inches)012 9.52 (3/8") 6.35 (1/4")015 12.7 (1/2") 6.35 (1/4")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 pipesRemove the protection caps from the copper pipe ends.Holding the tube downward, cut the extreme end off, removing anycopper shavings with a deburring blade.Remove the flare nuts from the “FLARE” connection body of theindoor unit and insert them into the pipes.Make the flare to the pipe end with the proper flaring tool.Flare end must not have any burrs or imperfections.The length of the flared walls must be uniform.Lubricate the end of pipe and the thread of the flare connectionwith anti-freeze oil.Tighten by hand and then use two wrenches to tighten allconnections fully, applying the tightening torque shown in the table.Pipe connection to the unitUse two wrenches to tighten all connections.Insufficient tightening torque could cause a refrigerant leak fromthe connection.Excessive tightening torque will damage the pipe flare.Tube diameter Torquemm (inches) Nm6.35 (1/4") 14÷189.52 (3/8") 33÷4212.70 (1/2") 50÷62Once all connections have been completed, check for leaks usingsoapy water.Finally, wrap connections with anti-condensate insulation andtighten with tape, without exerting excessive pressure on theinsulation. Repair and cover any possible cracks in the insulation.CheckingPour several litres of water into the condensate drain pan and checkthat it flows freely to the drain.Check pipe gradient and look for possible obstructions.Refrigerant connections Pipe Pipe insulation Adhesive tape