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TERMS AND CONDITIONS OF SALE
HEATER MAJOR COMPONENTS - TM-5-3895-374-24-2_276

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 HEATER MAJOR COMPONENTS EXPANSION  TANK:  The  expansion  tank  stores  cooler  heat  transfer  fluid  which  is  not  to  be  circulated.  Tile expansion  tank  is  connected  to  the  jacketed  firebox    via  the    exclusive  CEI  heat  trap.    This  provides  for maximum  life    of  the  heat  transfer  fluid  by  keeping  this  non-circulating  fluid’s  surface  temperature  at  a minimum.  Additional heat transfer fluid may be added to the system through the fill cap located on top of the expansion tank.  The Magnetrol Low-Level Control located on the burner end of the expansion tank will shut down the heater if the level of heat transfer fluid drops below a desirable minimum. BURNER: The burner provides heat by burning -light fuel oil only (oil units) -natural gas or LP gas (gas units) -light fuel oil or natural gas or LP gas (combination) -heavy fuel oil only (heavy oil units) Combination units have a fuel selector switch located in the panel box to facilitate switching from burning fuel oil to gas or from burning  gas  to  fuel  oil.    All  CEI  model  heaters  are  equipped  with  a  full  modulation  burner monitored  by  a  micro  processor  type  control.    With  a  standard  3:1  turn  down  ratio  the  burner  modulates through  a  continuous  range  of  firing  rates  to  match  the  heat  demand  of  the  system.    Burner  cycling  is minimized with an adjustable modulation band width in the temperature controller. JACKETED   FIREBOX:   Combustion   from   the   burner   occurs   in   the   firebox.      The   hot   gases   caused   by combustion must pass twice through the firebox before exiting through the heat exchanger, which is located at the same end of the firebox as the burner.  The firebox jacket contains flow control rings, which force the heat transfer fluid to circulate around the entire firebox, thereby increasing heat transfer efficiency and eliminating hot spots.  The thermal or heat transfer resistance which exists between the combustion gases and the heat transfer oil is minimized This is accomplished by using materials which have a high thermal conductivity and optimum  thicknesses  which  do  not  compromise  on  the  structural  integrity  of  the  firebox.    The  firebox  heat transfer surface area is fully utilized leaving no direct heat sinks to the atmosphere as found in internal helical coil designs. HEAT EXCHANGER.  Combustion gases in the firebox exit the firebox through the heat exchanger.  These gases travel inside a set of densely packed boiler tubes (Due to the close packing of the tubes, roughly 50% of the  heater’s  total  heat  transfer  surface  area  is  achieved  within  the  heat  exchanger).    The  heat  transfer  oil passes  on  the  outside  of  these  tubes  in  a  multi-pass  positive  forced  flow  pattern.    Extremely  high  forced convection  heat  transfer  coefficients  arm  experienced  in  the  heat  exchanger  by  maintaining  high  oil  flow velocities in each pass of the flow pattern.  Automated welding page 3-909







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