d. Test Procedure.(1) Energize power supply and adjust to read 20volts on V1, Open valve to the fuel supply.(2) Leave switch B in the off position (LO), andturn switch A. Make the following observations duringstarting cycle:(a) Ignition time. Ignition of this heater maybeinaudible when burning diesel fuel. Ignition must oc-cur within 75 seconds maximum. If exact ignition timecannot be determined, flame detector switch crossover(indicated by pilot lamp lighting up) must be the deter-mining factor. Flame detector switch must light pilotlamp within 105 seconds.(b) Electric current as measured by ammetermust be 12.5 amperes or less.NOTEThe fuel control valve contains a fuel heaterwhich may be energized in ambients below70° F, drawing an extra 3.5 to 4.7 amperes. Ifthis occurs, disconnect the thermostat lead(No, 3 from the fuel control valve) from theterminal strip on the heater and retest,(3) Immediately after flame detector switch trips,turn on switch B (heater on HI). Adjust power supplyto read 24 volts on voltmeter V1, and observe the am-meter during running cycle. Electric current must be10.5 amperes maximum.(4) Let heater run for two minutes, and inspect ex-haust. No smoke should be visible.TM 9-23 50-256-34-1NOTEVisible smoke after two minutes of operationis not acceptable. Check for low voltage, aslow-running motor, or improperly calibratedfuel control valve. Some visible white smokeis normal until the flame detector switchtrips.(5) Restrict air flow into the ventilating air bloweruntil the overheat switch opens. Read the temperatureof the switch on the thermometer. Overheat cutouttemperature must be 350° to 500° F.(6) Remove ventilating air restriction. Heatershould resume burning without requiring a return tothe start cycle.(7) Adjust power supply to read 30 volts on volt-meter V1 and turn off switch B. Allow heater to runfor at least one minute. It must continue to burnsmoothly.(8) Adjust power supply to read 24 volts on volt-meter V, and turn off switch A to shut off heater. Ob-serve the time required for blower to shut off. Purgetime must be between 80 and 150 seconds.(9) If heater does not meet specifications, repairand retest,(10) Shut off power supply and fuel. Allow heaterto cool to a temperature at which it is easy to handle.Disconnect the fuel and electrical connections and re-move the pyrometer duct. Remove heater from teststand.Section VII.DeletedParagraphs 3-37 through 3-41.DeletedChange 33-18.33
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