INSTALLATION  (Contd.) Electrical   Connections: Important (Please  read  carefully.) CAUTION: The condenser on the Gas-Oil unit contains an immer- sion  heater. The unit must not — . be connected to a power source unless the condenser is filled with liquid and the line switch is in the "Off" position. This will  prevent the  heater  from burning out. WARNING : For  personal safety, this apparatus must be properly grounded. I The power   cord of this instrument is equipped  with  a  three-prong  (grounding) plug which mates with a standard three- prong (grounding) wall receptacle to minimize    the  possibility  of  electric shock hazard from this apparatus. The user    should  have  the  wall  receptacle and circuit checked  by  a  qualified electrician  to  make  sure  the  receptacle is properly grounded. Where a two- prong receptacle is encountered, it is the  personal  responsibility  and  obliga- tion of the user to have it replaced with a properly grounded three-prong wall  receptacle. WARNING: DO NOT, under any cir- cumstances, cut or    remove the third (ground) prong from the power  cord. DO NOT use a two- prong adapter plug. . Determine the total amount of current presently  being  used  by  other  apparatus connected to the circuit that will be used for this unit. It is critical that the added current demand and other equipment on the circuit not exceed the rating of the fuse or circuit breaker in use. Precision™  Instruction  Manual CAUTION: Be sure the power sup- ply is of the same voltage as specified  on  the  nameplate. Operating  procedures The Front View and Gas-Oil Distillation Units are designed to conform with the following  test  methods: ASTM D-86 (groups 1, 2, and 3)* ASTM  D-216 ASTM  D-233 ASTM  D-447 ASTM  D-850 ASTM D-1078 1P-123 1P-191 DIN-51761 D1N-51751 * NOTE: In addition,   the Gas-Oil Dis- tillation Unit conforms to ASTM D-86 (Group  4). Preparation of the apparatus, prepara^- tion of the sample, test procedure, cal^- culations and reporting, and appropriate tables are supplied in the ASTM Methods. ASTM test methods can be obtained from: American Society for Testing Materials 1916 Race Street Philadelphia,  Pennsylvania  19103 NOTE :    Heater Height Adjustment (Shield) Push  heater    elevating knob (Item 7) inwards  and  simultaneously  turn  knob  to reach  the  required  heater  height.  Turn- ing the knob only will strip either the gear rack or the pinion shaft. -3-