HVACR UNIT 55 QUESTIONS AND ANSWERS ALREADY PASSED

HVACR UNIT 55 QUESTIONS AND ANSWERS ALREADY PASSED A major difference between the operation of an oil furnace and a gas furnace is that: The oil must be atomized before ignition. An oil furnace heat exchanger is built: Like a drum. How are oil burner nozzles rated? Cone shape, spray angle, and GPH Modern residential oil furnaces sense the flames using: A cadmium sulfide cell. Sealed combustion oil furnaces use: High static oil burners. Select the functions that the primary control performs. You may select more than one. Provides flame safety shutdown, Controls ignition transformer, Starts and stops oil burner motor The cad cell senses the flames by: Dropping in resistance when exposed to light. The grade of fuel oil most commonly used in residential oil-fired furnaces is: Number 2. The grades of fuel oil are 1 through 6 with: 1 being the lightest and most distilled and having the lowest heating capacity. The heat in the combustion chamber is reflected and concentrated by the: Refractory The heating capacity of number 2 fuel oil is approximately: 140,000 BTU per gallon. The ignition operating sequence and flame safety are controlled on an oil burner by: The primary control. The ignition transformer provides: 8,000 to 15,000 volts AC to the electrodes. The output pressure of a high-pressure oil pump used in residential oil-fired furnaces is: 100 to 200 psi. The pressure-reducing valve is responsible for: Adding makeup water to the boiler. To resist corrosion, the recuperative cell on a condensing oil furnace is made of: High- quality stainless steel. Waste oil burners may need to be upgraded to accommodate which maximum grade of oil? B5 What allows for adjustment in the tertiary opening to enable fine-tuning of the burner? Variable burner head What components of the oil burner are responsible for