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13 Cards in this Set
- Front
- Back
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name & describe the 3 types of air filters.
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*disposable filters- non-cleanable and replaced with new ones *permanenet filters-can be cleaned & reused *electronic filters-usually used with cleanable type prefilters
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how is the inside humidity requirement affected by the outside temperature?
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the colder the outside temp. the greater the need for humidifaction
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what are the 3 types of evaporative humidifers?
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*rotating-drum evaporative humidifer *fan-powered evaporative humidifier *flow-through evaporative humidifier
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where is the fan located in respect to the heat exchanger on each type of furnace?
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*horizontal-horizontally over the heat exchanger *upflow or highboy-below the heat exchanger *downflow or counterflow-above the heat exchanger *multipossition furnace-fan can be positioned either way
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what is the range of particles removed by the electronic air filter?
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0.1 to 10 microamps
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where does the steam power humidifier get its steam?
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uses an electrical heating element immersed in a water reservior to evaporate moisture into the furnace supply-air plenum
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what are the two types of fan-motor arrangements?
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*belt drive *direct drive
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how much can the fan speed be adjusted with a variable-pitch motor pulley?
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30 percent
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if a motor has a 3 in. pulley,and the blower a 12 in. pulley, using a motor operating at 1200 rev/min,what is the speed of the fan?
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3 in. divided by 12 in. times 1200=600 rev/min.
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what are the 4 different configurations of parts available on forced warm air furnaces?
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*horizontal *upflow or highboy *downflow or counterflow *multiposition furnace
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describe the 2 types of heat exchangers on standard furnaces.
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*individual-section heat exchanger has a number of seperate heat exchangers *cylindrical heat exchanger has a single combustion chamber
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what material is used to construct the standard heat exchanger?
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cold-rolled,low-carbon steel with welded or crimped seams
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what is the purpose of the flushing device?
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drains & refills the reservoir with clean,fresh water every 12 hrs.
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