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Typical Oil Burner with On-Oil Fuel/Air Control Mode
MECHANICAL  OPERATION

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 Figure 22 Typical Oil Burner with Fixed Air Low Fire Start Fuel/Air Control Mode MECHANICAL  OPERATION:    The  fixed  air  low  fire  start  system uses a two-step, two-stage Oil Pump (2) with a Simplex Oil Nozzle (9).  A direct spark oil ignition system will normally be supplied, but certain insurance company codes could require a spark ignited gas pilot*  to  provide  ignition  for  the  main  oil  flame.    The  nozzle  flow rate  pressures  are  taken  at  the  Plugged  Pump  Nozzle  Pressure Gauge Port (6).  The low fire oil flow rate is set by adjusting the Oil Pump Low Pressure Regulator (8).  The high fire oil flow rate is set by adjusting the Oil Pump High Pressure Regulator (3).  For both high and low fires, turn the adjustment screws clockwise to increase   the   pressure   and   counterclockwise   to   decrease   the pressure to the Nozzle.  Approximate low fire pressures are 150 to 225 psig and high fire, 200 to 300 psig.  The Air Dampers (4) are adjusted  and  locked  in  place  with  the  Air  Damper  Arms  (5)  for correct  combustion  values  at  the  high  fire  rate.    At  light  off,  the Main  Oil  Solenoid  Valve  (1)  is  energized,  allowing  fuel  to  flow  to the Nozzle.  The normally open Low Fire Solenoid Valve (7) allows a reduced amount of oil to the Nozzle for low fire start.  When the flame is proven by the flame detector’, the low fire solenoid valve closes,  providing  full  high  fire  pressure  to  the  Oil  Nozzle.    The burner   operates   at   the   high   fire   position   until   the   system   load demand is satisfied.  Refer to page 31, Table 9 for specific nozzle pressures  and  firing  rates.    See  page  11,  Fig.    11  and  the  pump manufacturer’s   bulletin   supplied   with   the   burner   for   additional information. * Not shown in this depiction.  See page 3, Fig.  1. Note 1 The     system     depicted     uses     a     two-step Suntec  oil  pump.    If  a  pump  that  does  not have the integral two-step function has been specified  and  supplied,  it  will  be  provided with a N.C. nozzle bypass oil solenoid valve and   a   separate   adjustable   low   fire   relief valve.    Refer  to  the  oil  piping  diagram  and the oil pump manufacturer’s bulletin supplied   with   the   burner   for   specifics   on your system. Note 2 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 23 Typical Oil Burner with Low-High-Off or Low-High-Low Fuel/Air Control Mode Using Webster 22R Oil Pump (page 3-968)







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