What is the principle of operation for an economizer?
What will be an ideal response?
If the outside air is cool enough, it can be used to assist in cooling the building to reduce the load on the air conditioning system.
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A footing separate from the concrete floor is called a ____ footing.
A. spread B. slab C. typical D. form
What battery rating is tested at 32°F (0°C)?
A) Cold-cranking amperes (CCA) B) Cranking amperes (CA) C) Reserve capacity D) Battery voltage test
Safety protection should be worn:
A) At all times when performing any work that requires PPE. B) When working with liquids, vapors, or solid objects that are extremely hot or cold. C) When handling refrigerant cylinders. D) When working with power tools.
What size should the combustion air openings be for a room with an 80,000 BTU/hr input furnace and a 35,000 BTU/hr water heater if the openings are opening directly into a ventilated attic and a ventilated crawlspace?
A) 115,000 / 1,000 = 115 square inches free area each B) 115,000 / 2,000 = 57.5 square inches free area each C) 115,000 / 4,000 = 28.75 square inches free area each D) The size is irrelevant so long as there are combustion air vents