Author Question: The amount of outside air introduced can be controlled using: A) A CO sensor. B) An O2 sensor. C) ... (Read 43 times)

mynx · **on:** Jul 24, 2018

The amount of outside air introduced can be controlled using:

A) A CO sensor. B) An O2 sensor. C) A CO2 sensor. D) An N2 sensor.

Question 2

What makes the main valve in the reversing valve shift from one side to the other?

A) An electronic stepper motor mounted on one end of the reversing valve
B) Pressure difference from one side of the valve to the other
C) A solenoid coil creates a magnetic field that pulls the valve to one end and repels it to the other.
D) A small gear motor that is operated on 24 V engages gears on the back of the valve core.