What is the purpose of the roll-out switches?
A) to shut the gas valve off if flames roll out of the combustion area
B) to shut of the gas valve if the flames do not light within a few seconds
C) to shut off the gas valve if the air leaving the furnace becomes too hot
D) to coordinate the fan operation with the normal flame rollout on the furnace
Question 2
How is a concentric vent used in a high-efficiency furnace?
A) It creates two close exit points for the vent pipe and combustion air pipe.
B) It allows the vent pipe to combine with condensate drainage.
C) It directs the combustion air pipe to an outdoor exit.
D) It allows a single outdoor exit point for the vent and combustion air pipe.
Dewey and the reformers attacked classes, such as this one, circa 1900, where students sat up straig
The ability to roll the tongue is one of several traits that represent the dominant allele.
The camshaft is rotated in relation to the camshaft by the PCM to provide changes in valve timing.
A vane phaser is used to move the camshaft using changes of oil pressure from the oil control valve.
A typical variable cam timing control valve. The solenoid is controlled by the engine computer and ...
A vacuum-operated EGR valve. The vacuum to the EGR valve is computer controlled by the EGR valve ...