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TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 ADJUSTING COMBUSTION MIXTURE FULL MODULATION FIRING (NORMAL) This  method  provides  the  user  with  a  continuous  range  of  firing  rates  Varying  between  what  is known as high and low fire.  Unlike a two-stage burner, the modulator or damper motor on this unit modulates  the  air  shutters  in  response  to  the  4  to  20  MA  signal  from  the  temperature  controller instead of a simple switch.  In fact, it is the temperature controller and the modulator motor that are responsible for the continuous range cf firing rates. The modulating air shutters may be adjusted by loosening the linkage and turning the stem to the desired location.  See Section 5.7 for instructions on adjusting linkage. The fuel oil input may be adjusted by loosening the linkage on the oil metering valve, then adjusting the operating shaft to increase or decrease the fuel oil flow capacity.  See Section 6.13 for details on the oil metering valve. The  linkage  to  the  air  and  fuel  valve  may  have  to  be  adjusted  to  shorter  or  longer  positions  to obtain an equal increase in air and fuel as the motor drives the linkage to high-fire position. CAUTION After any adjustments are made, be sure there is no binding of the linkage, or damper motor stalling at any point of travel. (page 3-947)







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