Hvacr unit Study guides, Class notes & Summaries

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 co...

HVACR UNIT 32 QUESTIONS WITH CORRECT ANSWERS!!

A properly placed ladder should have film footing, and the top of the ladder should be - At least three feet above the roof A refrigerant container should never be heated or stored in temperatures above: - 125°F. A simple tool that technicians can use to check for energized circuits is a: - Noncontact voltage detector A typical household outlet has a breaker that will shut off power if 15 amps of current is exceeded. But it only takes how many amps to cause your heart to stop beating. - b...

A grain is a small measurement of weight that is used to measure water vapor in the air. How many grains are equal to one pound? - 7,000 Area measurements are used to measure: - The size of a floor in a room. For which of the following measurements is area used? - Surfaces How many grains are in a pound? - 7,000 How many ounces equal one pound? - 16 If you have a system with a 4 gallon per minute (gpm) flow rate, how many gallons will be delivered in one hour? - 240 gallons If you need t...

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Does sensible hat gain cause the temp in the house to increase? - Yes Htms are calculated how? - Multiplying the U-value times the temperature difference In Manual J, what refers to anything that light can pass through, including windows, skylights, and glass doors? - Feneatration Infiltration calculations in manual J8 are based on what? - Estimates of air changes in the house Latent heat gain that results from increased what in the air in the house? - Moisture Manual J uses what percent o...