TM 9-2350-247-10OPERATE ENGINE COOLANT HEATER KIT (M548A3) — Continued 0041 00CAUTIONOverheating will damage the batteries. Don’t use the engine coolant heater if the temperature isabove -25F (-32C). Make sure both manual shutoff valves are open before you start the heater.If coolant doesn’t flow, the heater will be damaged.5. Hold RUN-OFF-START switch to START until indicator light comes on. Then move switch straight to RUN withoutstopping in the OFF position.NOTEWhen 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 stopautomatic-ally and must be restarted manually.6. Select high or low heat with the hi-lo switch. The heater will always start on low heat no matter how the hi-lo switch isset, and will go to high after it starts if the switch is at HI.7. If heater doesn’t start, try again. If it doesn’t start in three tries, troubleshoot it (WP 0055 00).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 valve(inlet) before you start engine.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 (inlet) by turning the handle clockwise whenever you stop theheater.8. 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.0041 00-3
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