TM 9-2350-247-10OPERATE ENGINE COOLANT HEATER KIT (M548A1) — Continued 0040 00NOTEWhen the switch is at HI, the heater will automatically transfer to low heat if coolanttemperature reaches 190F (88C), and will switch back to high heat if coolant temperaturedrops to 120F (49C). If coolant should reach 245F ±15F (118C ±9C), the heater will stopautomatically and must be restarted manually.7. Select high or low heat with the HI-LO switch. The heater will always start on low heat no matter how the HI-LO switchis set, and will go to high after it starts, if the switch is set at HI.8. If heater doesn’t start, try again. If it doesn’t start in three tries, notify unit maintenance.CAUTIONTo avoid discharging batteries, do not operate lights, radios, or other electrical equipment forvery long while coolant heater is running. Always turn off heater and close coolant shutoff valvebefore you start engine.9. If you don’t operate carrier after 12 hours of running engine coolant heater, run the engine until batteries are charged.Stop coolant heater while the engine is running. Keep fuel tank full.NOTEThe heater will stop burning right away, but the combustion air blower will run until the heateris purged of fuel and the burner is cool. The indicator light will stay on until the blower stops.Close the coolant shutoff valve by turning the handle clockwise whenever you stop the heater.10. To turn heater off, move the RUN-OFF-START switch to OFF.END OF TASK0040 00-3/4 blank
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