When is the gas valve energized on an induced draft furnace that uses hot surface ignition?
A) After the draft switch closes to prove the draft
B) At the same time the induced draft blower is energized
C) On the initial call for heat
D) 1 to 2 minutes After the igniter has been energized
D
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The most common form of on-site waste water treatment for homes not hooked up to sewer lines is the:
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