Multi-stage thermostats provide energy savings by cycling on stages of heating or cooling based on _____.
a. demand
b. pump size
c. preset timers
d. time delay relays
a. demand
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Which of the following is NOT a benefit of a CAD system?
A. Drawings are very clear B. Drawing revisions are much easier C. Less training is required D. Drawings can be resized to show more or less detail
? Mikhail Gorbachev ?
What will be an ideal response?
The typical start up sequence for a hot surface ignition system is
A) Combustion blower, indoor blower, igniter, and gas valve all energized simultaneously B) Combustion blower energized, igniter energized and gas valve energized, flames sensed, indoor blower energized after time delay C) Combustion blower pre-purge, igniter energized after a delay, gas valve energized after a delay, flames sensed, indoor blower energized after time delay D) Gas valve and igniter energized, flames sensed, combustion blower and indoor blower energized after time delay
Humans are carnivores.
Answer the following statement true (T) or false (F)