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Figure 24 Typical Oil Burner with Low-High-Off or Low-High-Low Fuel/Air Control Mode Using a Two-Step Oil Pump.  (Model C-0)
Figure 26 Gas or Gas/Oil Burner Fuel/Air Premix Adjustment - Oil, or Gas/Oil Burner Diffuser Adjustment

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 the Air Dampers is controlled by positioning the Air Damper Drive Arm (13) relative to the Acorn Nut (16) mounted on the end of the Hydraulic Cylinder (9) piston rod.  The maximum travel is with the Damper Drive Arm positioned to be in contact with the hydraulic oil cylinder Acorn Nut at all times.  If less travel is desired, set the Air Damper  Drive  Arm  to  allow  a  gap  between  it  and  the  Acorn  Nut. (Depending  on  Air  Damper  positioning,  it  may  be  necessary  to loosen    its    set    screws    to    attain    proper    Air    Damper    opening distance.) The wider the gap (when the burner is off), the less the overall travel when going to high fire  position.    When  setting  the  Drive  Arm  position  relative  to  the Acorn  Nut,  make  certain  that  the  Air  Damper  travel  is  correct  for proper   combustion   at   all   firing   positions   and   that   there   is   no binding  of  the  Linkage  or  Dampers.    Maker  certain  the  cast  iron Linkage Return Weight (15) is secure on its Linkage Arm (17). *Not shown in this depiction.  See page 4, Fig.  2. Note 1 Component     operational sequencing will vary    with    the    specific    Flame    Safeguard Control   being   used   Refer   to   the   specific Flame  Safeguard  Control  bulletin   supplied with the burner for complete information. Figure 25 Typical Oil Burner with Full Modulation Fuel/Air Control MECHANICAL OPERATION:  The Full Modulation system uses a two-stage  Oil  Pump  (2)  with  an  internal  bypass  type  Oil  Nozzle (See   page   20,   note   1).      A   Modulating   Motor   (4)   controls   the positioning of the Air Dampers (6) and the Modulating Oil Valve (5) in  the  nozzle  return  line  through  mechanical  linkage.    A  direct spark oil ignition system will normally be supplied at firing rates up to 45 GPH.  Above that rate burners will be supplied with a spark ignited  gas  pilot’  to  light  the  main  oil  flame.    Certain  insurance company codes will require the gas pilot system on all input sizes. At   main   flame   light   off   the   normally   closed   Oil   Valve   (1)   is energized,  allowing  oil  to  flow  to  the  Nozzle.    The  Modulating  Oil Valve is adjusted to allow a controlled amount of oil to bypass the Nozzle,  which  keeps  the  pressure  reduced  to  the  nozzle  for  low fire light off.  Nozzle oil supply pressure is set by adjusting the Oil Pump   pressure   regulating   1/8”   Allen   wrench   fitting   (7).      Turn clockwise   to   increase   the   pressure   and   counterclockwise   to decrease   the   pressure   to   the   nozzle.      The   low   fire   nozzle pressures should be taken at the plugged Oil  Pump  Gauge  Port  (8)  and  should  be  approximately  300  PSI (but could be as low as 240 PSI on certain inputs of the C4 and C5 models) with pressure at the Nozzle Bypass Gauge Port (9) from 60  to  100  PSI,  these  pressures  varying  with  nozzle  size  and  job conditions.  A typical low fire oil flow setting on the Modulating Oil Valve would be number 7, but will vary with job conditions.  After a brief   period   of   time   for   the   low   fire   flame   to   stabilize,   the Modulating  Motor  will  drive  the  Fuel/Air  Linkage  (10)  to  the  high fire position.  At this point the Air Dampers will be full open (or as required for good combustion) and the Modulating Oil Valve will be at  the  “closed”  position  and  the  nozzle  bypass  line  will  be  fully closed,  putting  full  oil  pressure  to  the  Nozzle.    The  Oil  Pump pressure  Gauge  Port  pressure  reading  will  show  approximately 300 PSI and pressures at the bypass pressure gauge port will be 180 to 225 PSI, although this will vary with the specific nozzle size being used.  Refer to page 30, Table 8 to determine specific nozzle pressures and firing rates.  A modulating (page 3 - 971)







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