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Technical Conference - Panama City Beach, Fl - 2002 Flame Rectification l Remember Ohm’s Law E = I X R

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Technical Conference - Panama City Beach, Fl - 2002 Applied AC voltage + - ++ - Alternating Current Sine Wave

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Technical Conference - Panama City Beach, Fl - 2002 Basic Electrical Circuit + - SOURCE CONDUCTOR LOAD CONTROL

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Technical Conference - Panama City Beach, Fl - 2002 Flame Rectification circuit! What devices are used for electrodes? äFlame rod äBurner

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Technical Conference - Panama City Beach, Fl - 2002 l The Voltage Source is the Ignition Control l The “load” is the flame sensing circuit inside the control l The conductors are the electrodes already identified. l What acts as the “switch”? l The flame completes the circuit. Flame Rectification Circuit

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Technical Conference - Panama City Beach, Fl - 2002 Flame Sense Circuit ä One electrode is larger than the other causing electron flow to be greater in one direction than in the other. ä Compare the burner size to the flame rod size.

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Technical Conference - Panama City Beach, Fl - 2002 +0-+0- 5a5a Current flow when flame rod is positive + _ F G

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Technical Conference - Panama City Beach, Fl - 2002 +0-+0- 1a1a Current flow when flame rod is negative + _ F G

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Technical Conference - Panama City Beach, Fl - 2002 Applied AC voltage - ++ - a a Effect = 4 a pulsating DC Effective Flame Signal

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Technical Conference - Panama City Beach, Fl - 2002 Remember Ohm’s Law ? What happens in a circuit if resistance increases and voltage stays the same? Flame Rectification Circuit

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Technical Conference - Panama City Beach, Fl - 2002 Typical Flame Detection Current Need to measure AC A as well as DC A Typical in-shot burner DC current is 2-5 A with a 4-8 A AC leakage. DC current is less than 1 A and AC current is at or above 4 A 1.Flame signal is weak 2.Corrective action is required

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Technical Conference - Panama City Beach, Fl - 2002 DC Current vs. AC Current

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Technical Conference - Panama City Beach, Fl - 2002 DC Current vs. AC Current DC CURRENTAC CURRENTAC DROPOUT 0.53.9410.39 1.04.3717.28 1.54.8820.1 2.05.4520.30 2.56.2024.37 3.06.9524.20 3.58.2924.22

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Technical Conference - Panama City Beach, Fl - 2002 Remember Ohm’s Law ? What happens in a circuit if resistance increases and voltage stays the same? What can affect the resistance in the circuit? What else can affect the flame signal? Flame Rectification Circuit

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Technical Conference - Panama City Beach, Fl - 2002 Increased circuit resistances l Burner oxidation l Non-secure burner l Flame “lift off” l Loose wire connections l Contaminated flame sensor l Faulty grounds l No grounds l Reverse polarity

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