A(n) ____ can open and close a gas valve, control a spark or hot-surface igniter, and monitor interlocks.
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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 furnace’s need for fresh air can result in ____.
A furnace’s need for fresh air can result in ____.
A(n) ____ draft regulator opens when pulled open by the nega…
A(n) ____ draft regulator opens when pulled open by the negative pressure of flue gas suction.
A furnace that can be reconfigured to allow airflow through…
A furnace that can be reconfigured to allow airflow through in any direction is a ____ furnace.
A furnace with an AFUE rating between 90% and 97% is a ____…
A furnace with an AFUE rating between 90% and 97% is a ____ gas furnace.
What type of furnaces are high efficiency with AFUE ratings…
What type of furnaces are high efficiency with AFUE ratings above 90%?
A highboy furnace ____.
A highboy furnace ____.
An ignition system that burns and monitors its pilot light o…
An ignition system that burns and monitors its pilot light only while the thermostat is calling for heat is a(n) ____.
A(n) ____ uses advanced electronics to provide greater contr…
A(n) ____ uses advanced electronics to provide greater control and functionality.