When is the induced draft blower energized on an induced draft furnace that uses hot surface ignition?
A) 1 to 2 minutes After the igniter has been energized
B) At the same time the gas valve is energized
C) After the draft switch closes to prove the draft
D) On the initial call for heat
D
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Explain how a centrifugal pump operates.
a. Positively displaces fluid with a reciprocating motion. b. Spins liquid from the suction eye into a volute. c. Positively displaces liquid with a rotary motion. d. Dynamically spins liquid axially into discharge.
To determine the takeout of a 45-degree elbow, multiply the nominal size of the elbow by ____.
a. 1/2 b. 5/8 c. 1 d. 1-1/2
The power wire for the condensing unit is sized:
A) By the minimum circuit ampacity (MCA) shown on the name plate. B) By the maximum overcurrent protection (MOP) shown on the nameplate. C) The same wire gauge as the wires inside the unit. D) At 115% of the minimum circuit ampacity shown on the nameplate.
The power steering control module will enter a self protection mode in the case of a(n) ________ condition
A) High temperature B) Strong cross-wind C) Icing D) Low tire pressure