Environmental heating and air conditioning refers to:

Environmental heating and air conditioning refers to:
 
  A) Cooling and heating homes and offices.
  B) Managing the air outside by reducing toxins and pollutants.
  C) Cooling the air, food products, and industrial machinery.
  D) Controlling air temperature, humidity, circulation, and cleanliness.

 Q. 2

Refrigerant recovery cylinders should not be filled above:
 
  A) 70 of their volume with liquid. B) 90 of their volume with liquid.
  C) 100 of their volume with liquid. D) 80 of their volume with liquid.

 Q. 3

Failure to properly ground the ignition module on a gas furnace may result in _____.
 
  a. flame sensor burnout
  b. high igniter current
  c. failure of the flame sensor to function
  d. excessive flame rectification