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TEMPERATURE CONTROLLER - TM-5-3895-374-24-2_309
OIL OPERATION - TM-5-3895-374-24-2_311

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 OPERATING AND INDICATING LIGHTS Ten lights are provided on the stack side of the panel box to simplify operation and problem determination.  A discussion of each light follows. PUMP MOTOR this light illuminates when the pump motor thermal overloads trip.  Possible problems could be a defective pump, a defective pump motor, defective or incorrectly sized thermal overloads, or a short in the wiring.  The heater will not run when this light is lit. BURNER  MOTOR  this  light  illuminates  when  the  burner  motor  thermal  overloads  trip.    Possible  problems could be a defective burner motor, defective or incorrectly sized thermal overloads or a short in the wiring. The heater will not run when this light is lit. LOW OIL this light illuminates when there is insufficient heat transfer fluid in the expansion tank to safely run the  heater.    This  light  is  illuminated  by  the  Magnetro:  low  oil  float  switch  located  in  the  stack  end  of  the expansion tank.  More heat transfer fluid must be added to the heater before the heater will operate again. Refer to Section 3.3 for the proper procedure for adding heat transfer fluid to the system. FLAME  FAILURE  this  light  illuminates  when  the  Flame  Safeguard  System  fails  to  detect  a  flame  during normal burner operation.  When a flame failure occurs, the burner and pump are shut down and will not run again  until  the  reset  button  on  the  programmer  is  depressed.    Section  9:  HEATER  TROUBLESHOOTING has a complete discussion of flame failures. HEAT DEMAND this light illuminates as part of the normal heater operating sequence when the temperature controller calls for heat (i.e.  the difference between the heat transfer fluid temperature and the set point on the temperature controller is great enough to activate the burner). LIMIT CIRCUIT this light illuminates as part of the normal heater operating sequence at the same time the HEAT DEMAND light illuminates.  This light illuminates when certain components have passed a preignition safety check.  Section 9.5: PROBLEM DETERMINATION explains what should be checked if the light does not illuminate. IGNITION  this  light  illuminates  as  part  of  the  normal  heater  operating  sequence  during  the  time  when  the ignition transformer is energized and ignition is attempted.  It normally stays illuminated for approximately 20 seconds. MAIN FUEL VALVE this light illuminates as part of the normal heater operating sequence when the main fuel valve to the burner opens.  This light should remain illuminated as long as the burner is running. HIGH LIMIT this light illuminates when the high limit switch shuts down the burner.  The circulating pump will continue  to  run.    The  programmer  will  display  the  message  "OFF".    The  burner  will  not  start  until  the temperature of the heat transfer oil drops below the temperature of the high limit switch setting.  When the burner starts again, the high limit light will go off. More information on the high limit switch can be found in Section 6.3. TIME CLOCK ENABLED - this light illuminates whenever the auto-manual switch, on the time clock, is in the auto position.  If the heater will not run, check this light to see if the time clock is prohibiting the heater from coming on. (page 3 - 944)







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