TM 5-3895-373-20
1.18.6. Screed
Burner
Controls
and
Indicators
Circuit. The screed burner circuit consists of the screed
fuel pump, glow plugs, solenoid valves, screed blowers,
indicator lights, and control switches.
There are four screed burners, one each for the left and
right main and extension screeds. Each screed control
panel includes controls for the main and extension
screed burners for that side. With the exception of the
screed fuel pump switch on the left screed control panel,
the two screed control panels are identical. Only the left
side will be discussed here.
Circuit breaker CB4 supplies power to the screed fuel
pump. Placing the screed fuel pump switch on the left
screed control panel in the up, ON position, energizes
the screed fuel pump and the indicator light.
Circuit breaker CB3 supplies 12 VDC to one contact on
the main and extension screed burner control switches
mounted on the screed control panel. Placing the main
screed burner control switch in the up, SPRAY position,
routes power to
the main screed fuel line isolation valve solenoid and the
screed burner indicator light. The extension screed
burner control switch performs a similar function for the
extension screed burner.
Circuit breaker CB2 supplies power to the main screed
glow plug through a second contact on the main screed
burner control switch. Placing the main screed burner
control switch in the down, PREHEAT position, supplies
power to the main screed glow plug. The glow plug
position is a momentary contact position; the glow plugs
will remain energized only as long as the switch is held.
The extension screed burner control switch performs the
same function for the extension screed burners with the
exception that electrical power is supplied by CB1.
Circuit breaker CB3 also supplies power to the screed
blower switches mounted on the screed control panel.
Placing the main screed blower switch in the up, ON
position, energizes the screed blower motor and indicator
light. The extension screed blower switch performs a
similar function for the extension screed blowers.
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