Why is it possible to use smaller vent pipes in higher-efficiency units?
A) The temperature of the flue gases is higher.
B) Condensation pushes the gas through the pipes.
C) Volume and temperature of flue gases are lower.
D) The volume of the flue gases is greater.
C
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High voltage is induced in the coil's secondary windings when the ____________________ magnetic field ____________________.
Fill in the blank(s) with the appropriate word(s).
A coating of aluminum on steel panels provides longer-lasting protection than zinc because it _____.
a. is not water soluble b. can be applied more evenly c. reflects damaging heat d. does not oxidize
The _______________ system actually changes or conditions a signal in three steps.
Fill in the blank(s) with the appropriate word(s).
Heat pump thermostats generally require two stages of heating in order to control:
A) The compressor and outdoor fan. B) The auxiliary heat. C) The indoor and outdoor sections. D) The first and second stage heat strips.