HVAC 49 11. 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 engine 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 SP 10 to lubricate O-rings. Lubricate seal washers prior to attaching refrigerant lines to components. Use SP 10 lubricant to lubricate O-rings.
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