Author Question: What is the difference between primary air and secondary air? A) Primary air is used for the main ... (Read 104 times)

lbcchick · **on:** Jul 24, 2018

What is the difference between primary air and secondary air?

A) Primary air is used for the main burner and secondary air is used for the auxiliary burners.
B) Primary air is mixed with the gas before ignition and secondary air is drawn in after ignition.
C) Secondary air is only used if the primary air source is depleted.
D) Primary air is used with natural gas and secondary air is used for LP gas.

Question 2

When an air handler has both a DX cooling coil and a hot water heating coil, which coil is located first in the airstream?

A) The two coils are in different airstreams.
B) The DX cooling coil
C) The hot water heating coil
D) The air does not travel over the hot water heating coil.