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AIR CONDITIONING
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TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 BODIES AND CABS SAFETY PRECAUTIONS Refrigerant  12  is  classified  as  a  safe  refrigerant;  however, certain   precautions   must   be   observed   to   protect   the   parts involved and to prevent personal injury to the serviceman. One of the most important safety measures to be taken while servicing the air conditioning system is adequate and constant protection of the eyes.  Safety goggles or other adequate eye protection must be worn.  The temperature of liquid refrigerant is a -29.5 deg.  C (-21.7 deg.  F).  Serious injury or blindness could result from refrigerant contacting the eyes. If   refrigerant   should   contact   the   eyes,   DO   NOT   rub   them. Splash    the    eyes    with    cold    water    to    gradually    get    the temperature above the freezing point.  Consult a doctor or eye specialist immediately. Should  liquid  refrigerant  come  in  contact  with  the  skin,  the resulting injury should be treated the same as though the skin has been frostbitten or frozen. Liquid refrigerant evaporates so rapidly that the resulting gas may     displace     the     oxygen     surrounding     the     work     area, especially if that area is relatively small and enclosed. To  prevent  possible  suffocation  in  an  enclosed  area,  always discharge the refrigerant from the air conditioning system out- of-doors or into an exhaust collector system.  Be certain that good  ventilation  is  always  maintained  around  the  work  area when discharging the system. Do   not   smoke   or   allow   any   type   of   fire   or   flame   in   the immediate    area    while    servicing    the    refrigeration    system. Refrigerant 12 is not combustible; however, in the presence of fire  it  changes  to  a  highly  poisonous  and  deadly  phosgene gas.  This gas will also tarnish bright metal surfaces. Never weld, solder, steam clean or use any excessive amount of   heat   on   any   of   the   refrigerant   lines   or   components   of refrigeration   system   while   the   system   is   charged.      Heat applied to any part would cause the pressure of the refrigerant within the closed system to become excessive. Be  certain  that  pressurized  refrigerant  containers  are  never exposed to open flame or temperatures above 51 deg.  C (125 deg.    F).    Do  not  discard  empty  refrigerant  containers  where they are likely to be subjected to the heat of trash burners, etc. Always    use    correct    refrigerant    hoses    (freon    type)    when replacing them.  Do not use hoses other than those specified for refrigeration use. SPECIAL SERVICE TOOLS Servicing    the    air    conditioning    system    effectually requires  proper  tools  and  equipment  especially  designed  for this work.  Recommended tool equipment is shown below. For further information and sources of this equipment refer to Service Tool Manual, CTS-1147. High Vacuum Pump The SE-2446 High Vacuum Pump (Fig.  24) is used to evacuate air and moisture from the air conditioning system prior  to  charging  the  system  with  refrigerant.    This  pump  is capable of removing all moisture and non-condensable gases from the system. CTS-2731   Page 15 PRINTED IN UNITED STATES OF AMERICA

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