61 and lever arm 63 is attached to rod 59 a solenoid 69 has a connector 71 and is mounted to body 12 elongated hole 67 fig4 of lever arm 63 is rotatably attached to connector 71 allowing solenoid 69 to rotate rod 59 and dampers 55 when solenoid 69 is actuated to move connector 71 vertically in addition to the mechanical components the damper system comprises electrical sensors and control components a thermostat 73 is mounted within body 12 and near heating chamber 24 thermostat 73 producing an output signal relative to the temperature within heating chamber 24 that is monitored by a control module 75 control module 75 is also mounted within body 12 and controls the operation of burners 35 37 and controls solenoid 69 to open and close dampers 55 in response to the output signal from thermostat 73 fig6 is a schematic drawing of the electronic controls for the damper system of the preferred embodiment thermostat 73 is connected to control module 75 through leads 77 79 and 81 and through contact block and terminal block 85 to provide power for the electrical components a battery 87 is connected to control module 75 through leads 89 and 91 with circuit breaker 93 connecting leads 89 91 leads 95 and 97 provide for grounding of control module 75 and battery 87 respectively wiring harness 99 provides a three wire connection between solenoid 69 and control module 75 referring to the figures in operation a volume of asphalt mix materials is placed in hopper compartment 13 to be heated and dispensed for use in repairing an asphalt pavement when thermostat 73 produces an output signal that indicates a low temperature in heating chamber 24 control module 75 sends electrical signals through wiring harness 99 that cause solenoid.