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HVAC
BPI Heating Professional
Gas & Oil Appliance Inspection
Knowledge Check
Gas & Oil Appliance Inspection
Knowledge Check
Knowledge Check
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What is hot surface ignition (HSI) and why has it largely replaced standing pilot systems on modern furnaces?
A
HSI uses a small pilot flame that ignites only when heat is called for, saving gas compared to continuous standing pilots
B
Hot surface ignition refers to a safety system that shuts down the furnace if surfaces overheat
C
A silicon carbide or silicon nitride element heats to 1,800-2,500 F to ignite gas directly, eliminating the standby gas waste of a continuous pilot
D
HSI uses a high-voltage spark to ignite a pilot, then the pilot lights the main burner
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