30 0 0 4 6 The  wire  sizes  recommended  in  the  above  table  are suitable  for the compressor unit.  If other electrical equipment is connected  to  the  same  circuit,  the  total  electrical  load  must  be considered  in  selecting  the  proper  wire  sizes.      A   burned   out motor   due   to   low   voltage   may   result   unless   it   is   properly protected. Before  wiring  the  compressor  to  the  power  supply,  the electrical rating of the motor, as shown on the motor nameplate, must be checked against the electrical supply. If   they   are   not the same, do not connect the motor. It is important that the wire used be the proper size and all  connections secured mechanically and electrically. The size of the wire shown in the table above is a safe guide. larger    wire    will    probably    be    necessary    and    your    electrical contractor   or   local   electric   company   should   be   consulted   for recommendations. The use of too small wire results in sluggish operation, unnecessary tripping of the overload relays or blown fuses. FUSES Fuse failure usually results from the use of fuses of insufficient  capacity.    If  fuses  are  the  correct  size  and  still  fail, check for conditions that cause local heating, such as bent, weak or     corroded     fuse     clips.          Refer     to     the     table     below     for recommendations on the proper fuse size to be used.  Also refer to     the     regulations     of     the     National Electrical Code and requirements of the local code. DUAL ELEMENT FUSE SIZE-60HERTZ UL CLASS RK-5 600V VOLTAGE MOTOR THREE PHASE HORSEPOWER 200 230 460 575 10 40 35 17.5 12 15 70 50 35 20 20 75 70 35 35 25 90 80 40 35 30 110 100 70 40 DUAL ELEMENT FUSE SIZE-60HERTZ UL CLASS RK-5 600V VOLTAGE MOTOR THREE PHASE HORSEPOWER 190 220 380 440 10 45 35 25 17.5 15 60 50 30 25 20 80 70 40 30 25 100 80 50 40 30 125 100 60 50 MAGNETIC STARTER (See Electrical Diagrams On Page 24). This  compressor  must  be  equipped  ,  with  a  magnetic starter  Note-that  the  Pressure  Switch,  the  Oil  Level  Switch  and the On-Off Switch are wired to the operating coil of the magnetic starter and serves to interrupt current flow to the motor. All  starters  must  include  thermal  overload  protection to  prevent  possible  motor  damage  from  overloading.    These starters are furnished  with  the  manufacturer’s  ;instructions  for installation.      Ingersoll-Rand   cannot   accept   responsibility   for damages    arising    from    failure    to    provide    adequate    motor protection. Duplex   Models   may   be   equipped   with   alternating control circuits for equalizing operation of both compressors Step 6. COMPRESSOR STARTUP Do not connect the compressor piping to your system at this time. (A) Fill the crankcase to the proper level with the correct grade of lubricating oil.  Use only petroleum based oil for  the  initial  start-up.    (See  Page  11  for  Lubrication Specifications ) Tighten the oil plug.  HAND TIGHTEN ONLY (B) Check   compressor   rotation   by   flicking   "Start-Stop’ switch.    Rotation  is  shown  by  arrow  on  belt  guard back.    If  rotation  is  incorrect,  interchange  two  of  the three leads on the three phase motors. (C) Prime    the    condensate    trap    if    supplied    on    your compressor.  (See Page 18 for Priming instructions A floor drain should be provided in a nearby location for condensate   drainage.      A   floor   drain   is   desirable whether the compressor is equipped with an automatic  condensate  trap  or  not.    All  compressors will have water condensate in the air receiver. Your   compressor   should   now   be   ready   for   the   initial startup  and  checks.    Close  the  service  valve  and  start  the compressor. Step 7. PRESSURE REGULATION Allow the air receiver to build up to pressure for which you ordered the machine.   At this pressure, the pressure switch should cause the unit to stop.  Open the service  valve and/or drain  valve  to  let  pressure  in  the  receiver  drop.    Note- the  pressure  at  which  the  compressor  starts/reloads.    If  the unit  does  not  Start  and  Stop/Load  and  Unload  at  the  correct pressure, you may need to adjust, the Pressure Switch/Auxiliary    Valve.        (See    section    III.        Regulation,    if adjustments are necessary). Run the compressor for about 10 minutes by bleeding air  from  the  receiver  to  let  the  unit  warm  up  and  observe  for excess vibration or any unusual noise.  While the compressor is running, pull ring on all safety valves to be sure they relieve and  reset  properly  Do  this  several  times.    Retorque  all  head bolts to 75 Ft Lbs.  (10.4 kg/meters). IF YOUR COMPRESSOR DOES NOT OPERATE PROPERLY, SHUT-DOWN IMMEDIATELY,  AND  CALL  YOUR  LOCAL INGERSOLL-RAND DISTRIBUTOR. Page 3-832