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.
Superior view of heart valves illustrating position, size, and shape of each valve.
A vane phaser is used to move the camshaft using changes of oil pressure from the oil control valve.
If the valve clearance (lash) is not correct, loosen the retaining nut and turn the valve adjusting ...
Start the valve adjustment procedure by first disconnecting and labeling, if necessary, all ...
Use a torque wrench and torque the valve cover retaining bolts to factory specifications.
Checking the fuel pressure using a fuelpressure gauge connected to the Schrader valve.