Electric furnaces can be installed as ____ furnaces.
A furnace with an AFUE range of approximately 79% to 83% is…
A furnace with an AFUE range of approximately 79% to 83% is a ____ gas furnace.
A reversing valve that uses a solenoid valve to direct high-…
A reversing valve that uses a solenoid valve to direct high- and low-pressure refrigerant to move the sliding section within the valve body is a ____.
In some furnaces, an opening in the flue, called a(n) ____,…
In some furnaces, an opening in the flue, called a(n) ____, helps keep constant pressure in the combustion chamber and prevents ambient air from reaching the furnace flame.
A humidifier that sprays small water droplets into the air i…
A humidifier that sprays small water droplets into the air is called a(n) ____ humidifier.
A typical forced-air furnace is equipped with a(n) ____.
A typical forced-air furnace is equipped with a(n) ____.
It is very important to install a humidifier’s ____ level.
It is very important to install a humidifier’s ____ level.
Which type of furnace can operate to produce either full hea…
Which type of furnace can operate to produce either full heat output or produce at a fixed level that is less than full heat?
A Category I furnace is a ____ furnace.
A Category I furnace is a ____ furnace.
Which of the following statements regarding hot-surface igni…
Which of the following statements regarding hot-surface ignition (HSI) systems is false?