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Exam (elaborations)

HVAC 101-HEATING FUNDAMENTALS FINAL EXAM QUESTIONS WITH CORRECT ANSWERS 2025

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HVAC 101-HEATING FUNDAMENTALS FINAL EXAM QUESTIONS WITH CORRECT ANSWERS 2025

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Hvac
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Uploaded on
January 18, 2025
Number of pages
3
Written in
2024/2025
Type
Exam (elaborations)
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Questions & answers

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  • hvac 101 heating fundamentals final exam questions

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HVAC 101-HEATING FUNDAMENTALS
FINAL EXAM QUESTIONS WITH
CORRECT ANSWERS 2025
WhatYisYanYSSUYandYwhatYdoesYitYdo?Y-YCORRECTYANSWERY-
ItYisYaYunitYlocatedYonYtheYsideYofYtheYfirstYwhichYreceivesYpowerY(120Yvolts)YbeforeYanythingYlocatedYwithin
YtheYfurnaceYitself.YItYprimarilyYconsistsYofYaYswitchYandYaYfuse,YandYitYisYwhatYallowsYforYpowerYtoYflowYtoYth

eYdoorYswitch.YOpeningYtheYswitchYonYtheYSSUYwillYcutYpowerYtoYeverythingYwithinYtheYfurnace.



WhatYisYanYOCPD?YDescribeYitsYfunctionYinYdetail.Y-YCORRECTYANSWERY-AnYOCPDYisYanYOver-
CurrentYProtectionYDevice,YandYitYwillYprotectYconductorsYandYequipmentYagainstYexcessYheatYgeneratedYb
yYover-currentYwithinYtheYcircuitYasYaYresultYofYoverloads,Yshort-circuits,YorYgroundYfaults.



WhatYdoesY"FR"Ymean,YandYwhyYisYitYimportantYtoYtheYSequenceYofYOperations?Y-YCORRECTYANSWERY-
TheYabbreviationY"FR"YstandsYforYFanYRelay,YandYitYisYimportantYtoYtheYSequenceYofYOperationYbecauseYitYis
YallowsYforYtheYfanYtoYrunYinYorderYtoYsatisfyYtheYcallYforYheatYatYtheYthermostat.




WhatYisYtheYinletYgasYpressureYtoYGasYValve?Y-YCORRECTYANSWERY-7



WhatYisYtheYoutletYgasYpressureYforYtheYManifold?Y-YCORRECTYANSWERY-3.5



WhatYisYtheYIDR?YHowYdoesYitYfunction?Y-YCORRECTYANSWERY-
TheYIDRYisYtheYInducedYDraftYRelay,YandYthisYisYwhatYwillYsupplyYtheYIDMY(InducedYDraftYMotor)YwithYpower
YinY120YvoltsYwhenYitsYcoilYisYenergizedYbyY24YvoltsYduringYtheYcallYforYheatYatYtheYthermostatYwhenYtheYrYan

dYwYcontactsYthereinYconnect.



WhatYisYtheYIDM?YHowYdoesYitYfunction?Y-YCORRECTYANSWERY-
TheYInducedYDraftYMotor,YsometimesYknownYasYaYCombustionYBlower,YhasYtwoYprimaryYfunctionsYwithYinYa
YgasYfurnace.YItsYfirstYfunction,YwhichYappliesYtoYtheYSequenceYofYOperation,YallowsYforYairYtoYmoveYfromYth

eYHeatYExchangerYandYoutYtheYStructureYFluYOutlet.YTheYsecondYfunction,YwhichYdealsYinYtheYsafetyYofYtheY
systemYitself,YisYtoYactYasYaYsafetyYcontrolYforYtheYignitionYprocess;YaYPressureYSwitchYwillYmonitorYbetweenY
theYinletYpressureYofYtheYHeatYExchangerYandYtheYFluYOutlet.



WhatYisYtheYactionYofYtheYHighYLimitYSwitch?Y-YCORRECTYANSWERY-
TheYHighYLimitYSwitch,YwhichYisYanYAUTOMATICYswitch,YisYnormallyYclosedYbutYopensYforYaYriseYinYtemperat
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