A gas-fired furnace is shown in Figure 10-16.The hot com
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A gas-fired furnace is shown in Figure 10-16.The hot combustion gases pass through a heat exchanger to heat fresh air fo
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A gas-fired furnace is shown in Figure 10-16.The hot combustion gases pass through a heat exchanger to heat fresh air for space heating. The gas flow is controlled by an electric solenoid valve connected to a thermostat. The gas is ignited by a pilot light flame. A high-temperature switchshuts off all gas in the event of high temperature in the fresh air plenum a. Determine the various ways in which this system can fail, leading to excessive heating of the plenum and possible fire. b. What type of valve (normally open or normally closed) is recommended for the gas supply? c. What is the most likely failure mode? d. A problem can also arise because of failure of the pilot light, leading to combustible gases in the furnace, heat exchanger, and chimney. Suggest at least two ways to prevent this problem.
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