G2 Gas Technician Module 12 Revised Exam
Questions and answers with 100% Complete
Solutions | verified &updated 2024
What is the flame failure response test time for a thermocouple/thermopile
residential system. - ✔✔90 seconds
Closed circuit test(thermostat OPEN) on a thermopile system. - ✔✔600 milivolts
Pilot flame installation rules. - ✔✔Must no impinge on main burner or heat
exchanger, away from drafts and within the pilot flame about 3/8" to 1/2"
What is flame ionization? - ✔✔The process of heating air molecules to allow for
separation of electrons allowing a flame to conduct an electrical current. When
an AC signal is directed through the flame it will conduct an electrical charge
across the flame to the ground.
, What is flame rectification? - ✔✔When you over size your ground to prevent
a flame detector from getting a false positive and thinking there is still flame
present due to carbon build up.
Closed circuit test(thermostat CLOSED) on a thermopile system. - ✔✔400-
450 milivolts
What does a flame rod do? - ✔✔Senses a pulsating dc current that signals flame
is present.
How should you size a flame rod? Why? - ✔✔Must have 4 times less surface
area then the ground. Normal practice is 10 times smaller. This causes the signal
to flow easier from the flame rod to ground.
Pilot flame rectification-
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