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Related Flashcards
Cards In This Set
| Front | Back |
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The maximum temperature for type b pipe is?
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550 degrees f.
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What type of flue does a wall furnace use?
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Type BW
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What type of pipe do you use if the temperature exceeds 550 degrees
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Type L
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If a condensing gas furnace flue gas is less than 140 degrees what type of vent piping is used
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PVC
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What capacity rating would be used to determine the efficiency of the gas furnace?
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Output capacity
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What is the definition of temperature rise
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The difference between return and supply air
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List four types of forced air gas furnaces
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Up flow, down flow, horizontal, and multi positional
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What is the function of a gas furnace
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To produce useful heat necessary to raise the comfort level of a home or building.
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Heat exchangers are designed to produce what?
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A rapid transfer of heat from the combustion products to the supply air.
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Air which enters the burners and mixes with the gas before ignition, is known as what
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Primary air
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What percentage of the combustion air is referred to as excess air?
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The additional 5 cubic feet (50%)
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Products of combustion enter the draft hood and mix with air surrounding the furnaces. this additional air is known as
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Dilution air
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What are the two types of blower motors used with forced air furnaces?
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Belt drive and direct drive blower
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How many inches of water column (W.C.) will make one PSI of pressure?
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Equal to 27 inches of W.C.
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The instrument most commonly used to measure gas pressure is what?
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U-tube monometer
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