TM 5-3895-374-24-2ADJUSTINGCOMBUSTIONMIXTUREFULLMODULATIONFIRING(NORMAL)This method provides the user with a continuous range of firing rates Varying between what isknown as high and low fire. Unlike a two-stage burner, the modulator or damper motor on this unitmodulates the air shutters in response to the 4 to 20 MA signal from the temperature controllerinstead of a simple switch. In fact, it is the temperature controller and the modulator motor that areresponsible for the continuous range cf firing rates.The modulating air shutters may be adjusted by loosening the linkage and turning the stem to thedesired 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 adjustingthe operating shaft to increase or decrease the fuel oil flow capacity. See Section 6.13 for detailson the oil metering valve.The linkage to the air and fuel valve may have to be adjusted to shorter or longer positions toobtain an equal increase in air and fuel as the motor drives the linkage to high-fire position.CAUTIONAfter 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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