FATC 34 21.DO’s & DONT’s DO’S • Keep suction discharge hose assembly and liquid line capped until right before assembly of joint. • Ensure that protective sleeves are in proper location where specified • Lubricate all pre-installed O-rings with specified refrigerant mineral oil (Reference assembly instructions) prior to assembly of joints. Prelubricated, preinstalled O-rings do not require lubrication prior to installation unless the oil has absorbed into the O-ring and the surface is dry. • Seat O-ring in its female cavity prior to hand starting and torquing joint nuts. • Seat male end form with O-ring in its female cavity prior to torquing the mini block-fitting joint. • Use two wrenches for making each refrigerant joint connection - a calibrated torque wrench on the nut and a backup wrench on the mating nut or a block fitting wrench on the block. • Clip or secure hoses and lines as specified. • Be sure caps are tight on access valves. To insure tightness, screw caps down until cap seal contacts valve housing and then give it ¼ to ½ turn more. • Assemble dual O-ring fitting joints as follows: a) Oil bore with a specified oiling tool using mineral oil. b) Do not oil O-rings. c) Align end forms and then push together completely d) Tighten joint to specified torque using a backup wrench. • Rotate stock on a first-in first-out basis. • Finger start all mounting bolts that thread into compressor or brackets. Also finger start the bolt securing the block fitting on the suction discharge hose assembly to the compressor. • DO: Oil O-rings with mineral oil prior to assembling a refrigerant joint. Pre-oiled O-rings do not require oiling unless the oil has been absorbed into the O-ring and the surface is dry. • DO: Use specified mineral oil to lubricate O-rings (Reference assembly instructions ) • DO: Use correct refrigerant O-rings in the vehicle refrigerant system. (Refer to assembly instructions for part numbers). DON’TS • Make connections with bends, kinks, or obstructions in lines. • Use bolt or nut to “walk” manifold block or mini block into it’s mating part. Proper technique is with O-ring in seat, push blocks together trapping seal washer before running up and tightening the fastener. • Allow hoses and lines to rub against adjacent parts. • Bend metal lines to ease assembly. Do not use lines as a handle to lift the compressor or condenser. • Use lines contaminated with water. • Allow hoses and lines to directly contact sheet metal or touch hot bonnet components. • Use bent twisted, kinked or damaged hoses and lines. • Combine refrigerant joint assembly operations with “dirty” operations such as gritty brackets, oily suspension components, etc. • Process “broken” operations where one operator loosely assembles a joint and a subsequent operator tightens the joint to required torque. • Use PAG oil to lubricate O-rings. • Lubricate seal washers prior to attaching refrigerant lines to components. • Use PAG lubricant to lubricate O-rings.
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