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Académie
HVAC
NATE Hydronics Oil Service Specialty
Oil-Fired Boiler Diagnostics
Vérification des connaissances
Oil-Fired Boiler Diagnostics
Vérification des connaissances
Vérification des connaissances
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A cad cell on an oil burner primary control measures low resistance (near zero ohms) with the burner off. What condition does this indicate?
A
The cad cell is detecting ambient light, which will prevent the burner from firing because it simulates a flame-present condition
B
Low cad cell resistance indicates the ignition transformer is shorted
C
The cad cell resistance reading is normal for a properly functioning circuit
D
The cad cell is open-circuited and must be replaced
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