Using an antifreeze solution tester, check that the antifreeze content is sufficient for the existing ambient temperature.  Add  antifreeze  as  required. Whenever you fill the radiator with coolant after it has been drained, fasten a tag near the radiator cap. The tag should indicate the type of coolant and the degree of protection the coolant gives. Regardless of the air temperature, be sure to use an antifreeze solution in the proportions recommended in the instruction manual for the generator. Fuel The fuel tank should be filled with clean fuel oil, strained if necessary. Service the fuel tank as follows: WARNING Always  maintain  constant  metal-to-metal contact between the fuel tank filler neck and the spout of the fuel supply. That will prevent the possibility   of   sparking   caused   by   static electricity. Remove the fuel tank filler cap (fig. 3-1, view B), and fill the fuel tank with the proper fuel. (Refer to the instruction manual.) Replace the filler cap and wipe up any spilled fuel. Remove the cap from the fuel tank drain valve and open the valve. Let water and sediment drain into an approved  nonflammable  container.  When  clean  fuel runs out of the tank, close the drain valve and install the cap on the valve. A day tank is one of the major components of the fuel system. It has a capacity to permit engine operation for a minimum of 5 minutes. The day tank also provides a settling point for contaminants (to prevent their entry into the engine) and supplies fuel to the engine fuel pump. The day tank contains a dual type of float switch. The upper float operates in conjunction with the fuel solenoid  valve  to  maintain  a  predetermined  fuel  level  in the tank. The lower float initiates an engine shut-down sequence. This sequence is initiated in the event that the fuel level in the tank will permit operation of the generator set at the rated load for only 1 minute. You must drain sediment and water from the day tank as you did from the fuel tank. Remove the cap from the day tank drain valve and open the valve. (Refer to fig. 3-1, view B, for the location of the tank and its drain valve.) Drain water and sediment into a container. Close the valve when clean fuel runs out of the tank, and install the cap back on the valve. VENTILATION WARNING Do not operate the generator set in an enclosed area unless the exhaust gases are piped  to  the  outside.  Inhalation  ofexhaust  gases will result in serious injury or death. Keep the area around an operating generator set well ventilated at all times so that the generator set will receive a maximum supply of air. Consider ventilation when you install the units inside a building. Every internal combustionengine is a HEAT engine. Although heat does the work, excess amounts of it must be removed if the engine is to function properly. This can be accomplished by setting the radiator grille of the engine near an opening in the wall  and  providing  another  opening  directly  opposite the unit. In this manner, cool air can be drawn in and the hot air directed in a straight line outdoors. These openings  can  be  shielded  with  adjustable  louvers  to prevent the entrance of rain or snow.   In  addition,  when the generator is operating in extremely cold weather, the temperature in the room can be controlled by simply closing a portion of the discharge opening. Additional doors or windows should be provided in the shelter if the plants are installed in localities where the summer temperatures exceed 80°F at any time. 3-7