TM 5-3895-374-24-2 APPLICATION Ingersoll-Rand’s   Models   7100   and   3000   are   two stage.  Single acting.  air-cooled compressors that do not require  installation  on  a  special  foundation  They  can  be furnished as compact.  Self contained, receiver mounted compressors.    automatically  regulated  and  driven  by  an electric  motor.    An  air-cooled  after  cooler  along  with  an automatic   condensate   drain   trap   can   be   furnished   as optional  equipment.    They  are  also  sold  as  a  bare  or baseplate  mounted compressor These compressors may be used for any compressed     air     application     requiring     minimum     air pressure  of  50  PSIG  (3.5  kg/cm2)  with  the  maximum pressure  rating  for  the  MODEL  7100  being  250  PSIG (17.5  kg/cm2).    and  with  the  maximum  pressure  rating for the MODEL 3000 being 200 PSIG (14.0 kg/cm2). Application for the Models 7100 or  3000  as  either  a primary    or    supplementary    source    of    air    is    virtually unlimited  in  industrial  plants,  service  stations  and  auto repair shops.  Supplementary service includes such uses as  furnishing  air  at  pressure  rot  carried  in  regular  shop lines.    air  at  isolated  locations  standby  service  for  air when larger compressors are shut down. In    addition    to    the    many    advantages    offered    by compact. Air cooled construction, moderate  compressor speeds   large   area   plate   valves,   solid-end   connecting rods and positive-acting starting unloading provide long- life  dependability  These  compressors  are  equipped  with highly  efficient  intercooler  tubes  that  provide  maximum heat dissipation between stages of compression, resulting  in  more  air  per  horsepower  and  less  trouble from  oil  carbonization.    Simplified  design  permits  rapid access    to    any    part    of    the    unit    for    inspection    or replacement of parts. TWO-STAGE OPERATION The   Model   7100   and   Model   3000   are   two-stage machines  consisting  of  one  or  two  first-stage  cylinders with  the  same  bore  size  and  one  second-stage  cylinder with a smaller bore size. This  basic  principle  of  operation  of  these  two-stage compressors are as follows: On the suction stroke of the first-stage piston(s).   air  at  atmospheric  pressure  enters the  cylinders  through  the  inlet  filter(s)  and  then  the  inlet valves   located   in   the   airhead.      On   the   compression stroke  of  the  first-stage  piston(s),  the  air  is  compressed to an intermediate pressure and discharged through  the discharge  valves(s)  into  common  manifold(s)  From  the manifold(s) the air passes through the intercooler tubes, where the heat of first-stage compression is removed by the action of the fan passing cool air over the intercooler tubes.  On the suction stroke of the second-stage piston this  cooled  air  enters  the  second-stage  cylinder  through the  inlet  valve.    The  compression  stroke  of  the  second- stage  piston  compresses  the  air  to  the  final  discharge pressure  and  forces  it  out  through  the  discharge  valve into  the  receiver  or  system.    If  cooling  of  the  discharge air   is   required.      an   air-cooled   aftercooler   should   be installed   between   the   compressor   discharge   and   the receiver or system. For maintaining the receiver, or system, air pressure within   predetermined   limits,   the   compressor   may   be operated with one of two types of regulation.  The type of regulation   used   depends   upon   the   application.      (See page 9 for a description of the regulation types). Loadless  starting  is  accomplished  by  the  action  of the   centrifugal   unloader   operating   a   pilot   valve   which opens   a   line   from   the   compressor   second-stage   inlet manifold to atmosphere.  (See page 12 for description of Starting Unloading). SECTION II INSTALLATION AND START-UP RECOMMENDATIONS Step 1. Unload the compressor from delivering vehicle - the purchaser must arrange for adequate lifting equipment at the job site. IMPORTANT NOTE The   purchaser   assumes   title   to   the compressor equipment at the manufacturers shipping dock. Immediately upon receipt of the equipment,   It   should   be      inspected for any damage that may have occurred    during    the    shipment.        If damage is present, demand an inspection immediately by an inspector   from   the   carrier   Ask   him how to file a claim for damages Step 2. Check  compressor  nameplate  to  be  sure  the  unit  is the  model  and  size  ordered.    Do  this  before  uncrating. Check   Receiver   Nameplate   to   be   sure   the   tank    Is adequate for pressure at which you intend to operate. Step 3. Check motor nameplate to be sure motor is suitable for your electrical conditions (Volts-Phase-Hertz). IMPORTANT NOTE Do   Not   Use   Triple   Voltage   3   Phase Motor   For   200-208   Voltage   3   Phase Application  Must  Use  200  Volt  Motor Only. Page 3-830 TM 5-3895-374-24-2 Step 4. LOCATION & FOUNDATION