TM 3-4230-218-12&P(3) In high humidity areas,a slight decrease of the ambient temper-ature will cause air moisture to form condensation.Keep fuellines well covered and engine in a warm dry area. Reducecorrosion in high humidity areas by using warm, dry storageareas. Keep the engine covered and dry as possible.2-12.EMERGENCY PROCEDURES.a.EmergencyShutdown.(1) BurnerShutdown.Burner control system in this unit is normal-ly closed and is "fail-safe”.There is, however, one failurewhich requires a different style of burner shutdown. If burnerwill not extinguish when THERMOSTAT SELECTOR switch is setto OFF (OPEN MAG VALVE light remains OFF or ON). Performthe following:(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)Set BURNER FUEL VALVE fully clockwise.Carefully loosen heater fuel can lid and lift hoses untilsuction, filter, and return lines are both above fuel level.Listen for burner to cease operation (about 2 to 5 min-utes).Observe that no flow is coming from return line.Carefully position hoses so they do not drip fuel on anyhot surfaces. DO NOT REPLACE INTO FUEL CAN.Adjust WATER PRESS REGULATOR valve to maximumclockwise position.Run unit until indicated temperature is 40°C or less.If freezing temperature exist, shutdown unit in accordancewith page 2-40.Shut off engine.Notify Organizational Maintenance of malfunction.(2) If Engine Failure Occurs. If engine failure occurs, perform thefollowing:(a) Turn THERMOSTAT SELECTOR switch to OFF.(b) Attempt to re-establish fuel flow to engine by squeezingengine fuel line ball pump until fuel appears in in-linefilter.Prime carburetor and attempt to re-start.(c) Check for lack of/or contaminated fuel. Replace fuel ifnecessary. Attempt to re-start.2-43
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