What is the purpose of a Tattle Tale?
A) To tell the technician if the limits have opened at any time during the unit's operation
B) To prevent the limits from ever being exceeded in the furnace
C) To tell the electric furnace to turn off if the limits have been exceeded
D) To tell the technician if the furnace is turning on properly
Question 2
Communicating systems operate by:
A) Sending control signals over telephone wires.
B) Sending serial computer communications down a small number of wires.
C) Sending 24 V to each component that must be energized.
D) Connecting to the manufacturer's website via satellite connections.
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calculus limits help
calculus limits help