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In this way, applying power to the "open damper" terminal causes the motor to run until the damper is open while applying power at the "close damper" terminal causes the motor to run until the damper is closed. The motor is commonly powered from the same 24 volt AC power source that is used for the rest of the control system. This allows the ...
A simple electric heating element warms the air. When the thermostat calls for heat, blower and element come on at the same time. When thermostat is "satisfied", blower and element shut off. Requires very little maintenance. Usually more expensive to operate than a natural gas furnace.
As blast furnaces re-equipped after World War II, the favoured power source was either the diesel engine or the electric motor. These both had a rotary output, which worked well with contemporary developments in centrifugal fans capable of handling the huge volumes of air. Although the reciprocating steam blowing engine continued where it was ...
A centrifugal switch is an electric switch that operates using the centrifugal force created from a rotating shaft, most commonly that of an electric motor or gasoline engine. The switch is designed to activate or de-activate as a function of the rotational speed of the shaft.
An electric arc furnace (EAF) is a furnace that heats material by means of an electric arc. Industrial arc furnaces range in size from small units of approximately one-tonne capacity (used in foundries for producing cast iron products) up to about 400-tonne units used for secondary steelmaking .
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An illustration of furnace bellows operated by waterwheels from the Nong Shu, by Wang Zhen in 1313 during China's Yuan dynasty A Chinese fining and blast furnace in Tiangong Kaiwu, 1637 Cast iron has been found in China dating to the 5th century BC, but the earliest extant blast furnaces in China date to the 1st century AD and in the West from ...
Score $100 off right now at Walmart on the 4.5-quart, tilt-head model. Choose from a half-dozen different colors, including this match-anything silver. $259 at Walmart
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