Carrier 38GJt Owner's Manual & Installation Instructions

4.2 Installation of the Connection PipeConnecting piping for the indoor unit and outdoor unit are in the manifold mode (see the figure below).Fig 64.2.1 Piping between the Indoor and Outdoor Units(1) If the liquid and gas stop valves, which have the sign A , B, C, D or E , have not been connected to theindoor units, turn off the screw cap with the spanner airproof.(2) Refer to Fig.7 for the appropriate amount of torque to tighten the screws.(3) Point the flare end of the copper pipe at the screw and tighten the screw by hand.(4) Next, tighten the screw with the torque wrench until it emits a sound (as shown in Fig.7).(5) The bending degree of the pipe can not be too small; otherwise it will crack. Use a pipe tubebender to bend the pipe.(6) Wrap the exposed refrigerant pipe and the joints by sponge and then tighten them with the plastic tape.P ip e F la re N u tS p a n n e rFid 71) During the connection of the indoor unit and the refrigerant pipe, never pull the indoor unit joints forcefully,otherwise the capillary or other pipes may crack, which would result in leakage.2) The refrigerant pipe should be supported by brackets. Do not allow the unit to support the weight of the refrigerant pipe.3) If the piping connection size of the outdoor unit does not match the piping connection size of the indoor unit, use thepiping connection dimension of the indoor unit. Use different-diameter joints which is installing on the place ofthe piping connection to connect the indoor unit.4) For the Free Match system, each pipe should be labeled to indicate which system it belongs to avoid mistakeninaccurate piping.4.2.2 Allowable pipe length and drop height among indoor and outdoor unitsIf the total refrigerant pipe length (liquid pipe) is shorter than that listed in the table below, no additionalrefrigerant will be charged.Table 6Model 38GJQF30---3Total Liquid PipeLength (a+b+c+d+e) 131.2ft 131.2ft 131.2ftPipediameterThickness ofcopper tubeTighteningtorqueĭ1/4 inch 0315 inch 11̚ 22 ft·lbfĭ3/8 inch 0315 inch 26̚ 29 ft·lbfĭ1/2 inch 0315 inch 33̚ 37 ft·lbfĭ5/8 inch 0.0394 inch 44̚ 48 ft·lbf38GJQG36---3 3 8 G J Q G 4 2 - - - 310