MII CUIIIIITIDNING 13A 5 the condenser fins As the refrigerant cools in the con When metering R 12 into the refrigeration system denser it condenses into a liquid Still under high pre keep the supply tank or cans in an upright position ssure the refrigerant passes into the receiver The If the refrigerant container is on its side or upside receiver acts as a reservoir to furnish refrigerant to down liquid refrigerant will enter the system and the expansion valve at all times From the receiver damage the compressor the high pressure liquid refrigerant passes to the ex 4 4 pansion valve The expansion valve meters refrigerant WARNING Always maintain good Uenmfltw IL mfhe into the evaporator where t nw mmm is wmv Aww dmhmge me Wf m rm maintained by the suction side of the compressor As he Semce bay qxhamt syswm M Wmde the bmw it enters the evaporator the refrigerant immediately mg Large qumbmws of Tefngemm wpmi W a Smit begins to boil by absorbing the heat from the air pass POOH vqhlated mom can displace the mr and cause ing over the evaporator core Having given up its heat suffvwmlm to boil the refrigerant the air is cooled and passes into Although R 12 vapor is normally nonpoisonous it the passenger compartment of the vehicle The can be changed into a very poisonous gas if allowed to refrigerant continues to boil in the evaporator until all come in contact with an open flame D0 not discharge the liquid has vaporized From the evaporator the large quantities of refrigerant in an area having an refrigerant is drawn back to the compressor to repeat open flame A poisonous gas is produced when using the cycle the halide torch leak detector Avoid inhaling the REFEMGEMM SAFETY P Ecw 0 s fumes from the leak detector AThe refrigerant used in air conditioning systems is xgsmmwizgmxegf ZZ dichlorodxfluoromethane commonly known as S mw Rgfri mum in mmbmamm with moisture is Refrigerant 12 or R 12 It is transparent and color u e g mi an 2 eat dam 8 to all less in both the liquid and vapor state Since it has a ve lmwoswe a C mus gr ng boiling point of 2l 7 F below zero at atmospheric me a Surfacw pressure it vaporizes at all normal temperatures and pressures The vapor is heavier than air nonflam SERVWEVALVES mable and nonexplusive It is nonpoisonous except when in direct contact with open flame and is n0nc0r The dlscharge and S t f Servlce valves ue rusive except when combined with water Observe the ted to the mp sS j Yhn i r heed and are med f r following precautions when handling R 12 diagnosis charging discharging evacuatmg and com R 12 evaporates so rapidly at normal atmospheric ponent m0 a pressures and temperatures that it tends to freeze The service Valves have three P s t B fl anything it contacts For this reason extreme cm Q l A 3 The normal operating position shown in must be taken to prevent any liquid refrigerant from flame 13A 3 View B has the valve Stem turned contacting the skin and especially the eyes f l kWi 0 the b k d f t 1 io WARNING Always wear sqfety goggLes when servic When the valve stem is turned clockwise to the ing the refrigeratwn part of the air conditioning sys front seated full in position fig 13A 3 View A the tem Keep a battle of sterile mineral oil and a weak compressor is isolated from the system This position solution of boric acid handy when working on the is used when removing the compressor or when check refrigeration system Should any liquid refrigerant get ing compressor oil level into the eyes use u few drops of mineral oil to wcwh When the valve is midpositioned cracked fig hem out R 12 is rapidly absorbed by the oil Next 13A 3 View C the gauge port is open This position wash the eyes with the weak solution 0f bomb acid is used when charging discharging evacuating and Call a doctor immediately even though irritation has checking system pressures ceased afterjirst aid treatment WARNING Do not heat R 12 above 125 R pussy mug Mm ynmpgm Igggngly In most instances moderate heat is required to bring the pressure of the refrigerant in its container The Pressure Gauge and Manifold Assembly Tool above the pressure of the system when charging or 23575 fig 13A 4 is the most important tool used adding refrigerant A bucket or large pan of hot water to service the mir conditioning system The gauge as not over l25 F is all the heat required for this pur sembly is used to determine system high and low side pose Dv not heat the refrigerant container with a gauge pressures the correct refrigerant charge and in blowtorch or any other means that would raise tem system diagnosis It is designed to provide simul perature and pressure above this temperature D0 not taneous high and low side pressure indications weld ur steam clean on or near the system components because these pressures must be compared to deter or refrigerant lines mine correct system operation