Author Question: Describe how a main gas valve gets electrical power to open. What will be an ideal ... (Read 16 times)

misspop · **on:** Jul 26, 2018

Describe how a main gas valve gets electrical power to open.

What will be an ideal response?

Question 2

If there is a 240 V circuit that will be carrying 30 amps using 10 wire size, what is the maximum length of the two wire run that would limit the voltage drop to 3?

What will be an ideal response?

millet · **Reply #1 on:** Jul 26, 2018

Answer to Question 1

Pilot gas is fed to the assembly and burner orifice. The spark electrode is positioned to ignite the gas on a signal from the room thermostat. With the pilot ignited and burning, a sensing probe establishes an electric current sufficient to energize a relay that opens the main gas valve by closing normally open electrical contacts. At the same time the relay's normally closed electrical contacts in the spark ignition circuit open, terminating the spark. As long as the sensing probe recognizes the pilot flame, the relay coil will be energized, and normally closed contacts in the spark ignition system will remain open.

Answer to Question 2

115 feet