Installation clearances for rooftop units are required: A) To ...

[olgavictoria]

Installation clearances for rooftop units are required:
 
  A) To isolate the equipment from materials that might be damaged by refrigerant leaks.
  B) To ensure the correct airflow through the condenser coil.
  C) To maintain a safe distance between the wiring and combustible materials.
  D) To ensure that the weight of the unit does not rest directly on any roof trusses, beams, joists, or rafters.

Question 2

What controls the amount of gas entering the burner?
 
  A) The gas manifold pressure and the burner venturi size
  B) The draft created by the gas flames
  C) The gas valve
  D) The burner orifice size

[maaaaaaaaaa]

Answer to Question 1

B

Answer to Question 2

D