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HVAC
BPI Heating Professional
Gas & Oil Appliance Inspection
Vérification des connaissances
Gas & Oil Appliance Inspection
Vérification des connaissances
Vérification des connaissances
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An oil burner's cad cell (flame sensor) is used to prove flame presence. What does a cad cell measure and what happens if it becomes coated with soot?
A
A cad cell measures flue temperature; soot coating causes nuisance lockouts on high temperature
B
A cad cell measures oil pressure; soot coating causes the oil pump to cavitate
C
A cad cell measures combustion air pressure; soot coating reduces measured airflow and locks out the burner
D
A cad cell is a light-sensitive resistor that measures flame light; soot coating increases its resistance, causing the primary control to go to lockout even when flame is present
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