HVAC Gas Heat Certification Exam Prep (New 2024/ 2025 Update) Questions and Verified Answers 100% Correct | A Grade

HVAC Gas Heat Certification Exam Prep (New 2024/ 2025 Update) Questions and Verified Answers 100% Correct | A Grade QUESTION Describe the difference between a single-rod (local sensing ) and dual-rod (remote sensing system as the pertain to flame rectification. Answer: Flame rectification system can be classified as eatiher single rod. (local sensing) or dual rod (remote sensing) single rod, consist of an igniter and sensor all in one-rod, Dual-rod system use a separate igniter and flame-sensig rod. QUESTION Flame current is measure in _______. Answer: Microamps QUESTION What is a direct-vented furnace Answer: A direct-vented furnace is high efficiency gas furnace has a sealed combustion chamber. use a PVC air pipe to bring the air from outside . QUESTION What is a non-direct-vented furnace? Answer: Is a high-efficiency high furnace use indoor vent for combustion . QUESTION What is meant by a furnace that has a positive pressure venting system? Answer: A positive system can be vented vertically or through a sidewall. is a system whose flue pipe pressure is positive the entire distance to its terminal end QUESTION What s the dew point temperature as it applies to a condemning furnace? Answer: Dew-point temperature is the condensation process begins in the furnace and it varies depending o the composition of the flue gas and the amount of excess air. If the excess air decreases the dew point temperature increeases . QUESTION what is excess air? Answer: Excess air a combustion air and dilution air. Combustion air primary air/or secondary air, secondary air happens after combustion and it supports combustion. QUESTION What is dilution aiR Dilution air is a excess air after combustion and usually enter at the end of the heat exchanger.