TM 5-3895-373-201.18.6. Screed Burner Controls and IndicatorsCircuit. The screed burner circuit consists of the screedfuel pump, glow plugs, solenoid valves, screed blowers,indicator lights, and control switches.There are four screed burners, one each for the left andright main and extension screeds. Each screed controlpanel includes controls for the main and extensionscreed burners for that side. With the exception of thescreed fuel pump switch on the left screed control panel,the two screed control panels are identical. Only the leftside will be discussed here.Circuit breaker CB4 supplies power to the screed fuelpump. Placing the screed fuel pump switch on the leftscreed control panel in the up, ON position, energizesthe screed fuel pump and the indicator light.Circuit breaker CB3 supplies 12 VDC to one contact onthe main and extension screed burner control switchesmounted on the screed control panel. Placing the mainscreed burner control switch in the up, SPRAY position,routes power tothe main screed fuel line isolation valve solenoid and thescreed burner indicator light. The extension screedburner control switch performs a similar function for theextension screed burner.Circuit breaker CB2 supplies power to the main screedglow plug through a second contact on the main screedburner control switch. Placing the main screed burnercontrol switch in the down, PREHEAT position, suppliespower to the main screed glow plug. The glow plugposition is a momentary contact position; the glow plugswill remain energized only as long as the switch is held.The extension screed burner control switch performs thesame function for the extension screed burners with theexception that electrical power is supplied by CB1.Circuit breaker CB3 also supplies power to the screedblower switches mounted on the screed control panel.Placing the main screed blower switch in the up, ONposition, energizes the screed blower motor and indicatorlight. The extension screed blower switch performs asimilar function for the extension screed blowers.1-30
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