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HVAC Gas Heat Certification Exam Prep (Latest 2024 / 2025 Update) 100% Correct Questions and Verified Answers | Grade A
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HVAC Gas Heat Certification Exam Prep (Latest 2024 / 2025 Update) 100% Correct Questions and Verified Answers | Grade A Question: These are small burners used to ignite the gas burner on conventional gas furnaces? Answer: Pilots Question: What are the safety devices at the standing ...

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  • November 5, 2024
  • 37
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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HVAC Gas Heat Certification Exam
Prep (Latest Update)
100% Correct Questions and Verified
Answers | Grade A


Question:
These are small burners used to ignite the gas burner on conventional gas
furnaces?
Answer:
Pilots




Question:
What are the safety devices at the standing pilot?
Answer:
Flame Proving device, Thermocouples and Thermopiles, Bimetallic safety
device and liquid filled remote bulb

,Question:
A standard thermocouple is capable to generate how many millivolts?
Answer:
30 millivolts




Question:
What is a power Piles?
Answer:
is a ten thermocouples grouped together to form one generator, and in some
heaters is used to supply all power for he gas valve.




Question:
is a safety device when the pilot that his functions open the switch when gets
hot and it closed, and then when the pilot is cold switch is open?
Answer:
Liquid filled pilot safety device




Question:
This is a ignition system called HSI for what reason?
Answer:
HSI stand for Hot surface ignition is made quite special silicon able to handle
high temperatures and is also very fragile it can brake easily if is not handle
with care.

,Question:
What is a flame rectification ?
Answer:
uses a flame as a switch, rectification circuit converts AC power to DC power ,
with the change of AC To DC the gas control knows that the flame is there
and it is safe to operate .




Question:
High efficiency Gas Furnaces
Answer:
Reduce outdoor air infiltration and room depressurization, have multiple heat
exchanger, flue gas condensate disposal system and induced or forced power
drafted venting system, also operated below the dew point temperature of the
combustion gases.




Question:
is a furnace called EFF standards model what is the difference against the mid
EFF efficiency furnace
Answer:
The standard uses natural draft, vent stack do dilute the air. the AFUE is 78%
to 80% there is not condensing and one hat exchanger,


Mid efficiency uses induced draft blower for combustion gases AFUE is 78%
to 83%

, Question:
What us the AFUE rating in high EFF furnace
Answer:
87% 97% also has a multi heat exchanger uses pvc piping to vent the gas
combustion . the EFF is determine by the amount of heat transfer to the heat
medium is why is called high efficiency




Question:
What is AFUE? HSPF and SEER
Answer:
AFUE : Annual utilization Efficiency
HSPF : Heating seasonal performance Factor
SEER: Seasonal Energy efficiency Rating




Question:
What is a Two stages Gas furnace?
Answer:
Uses a two stages gas valve, and two speed combustion motor with two
pressure switches

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