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HVAC
NATE Hydronics Gas Service Specialty
Expansion Tank Service
Vérification des connaissances
Expansion Tank Service
Vérification des connaissances
Vérification des connaissances
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A modulating boiler is firing at 40% capacity during mild outdoor temperatures. If the outdoor temperature drops sharply, how does the modulating burner respond?
A
It switches to a fixed high-fire mode until supply temperature is reached
B
It remains at 40% until the room thermostat calls for a second stage
C
It cycles off and restarts at full fire after a timed delay
D
It gradually increases its firing rate to match the rising heat demand
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