Why are draft inducer fans necessary in today's furnaces?
A) To move gas into the burner assembly
B) To move the flue gases through the ductwork
C) The flue gases cannot make their way through the new heat exchangers on their own.
D) To separate the flue gas from the heat through centrifugal force
C
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Periodic cleaning is required on the _______________.
a. stack b. burner fuel lines c. bridgewall d. shock bank
The difference between an SCR and a diode is that an SCR _____.
a. has three terminals b. is bidirectional c. has a drain connected to the negative terminal d. is normally open
Equipment grounding conductor(s) or equipment bonding jumpers entering a box count as ____.
A. one branch B. one ground C. one device D. one conductor
When producing a shop drawing, the first step is to _____
a. determine the standard symbols for use, based on the specifications b. select a scale two to four times larger than the scale used for the design drawing c. properly locate all access doors, boots, fire dampers, and registers d. locate all ducts by dimensioning from the center line to the nearest column