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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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Presentation on theme: "Technical Conference - Panama City Beach, Fl - 2002 Flame Rectification l Remember Ohm’s Law E = I X R."— Presentation transcript:

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

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

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

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

5 Technical Conference - Panama City Beach, Fl 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

6 Technical Conference - Panama City Beach, Fl 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.

7 Technical Conference - Panama City Beach, Fl a5a Current flow when flame rod is positive + _ F G

8 Technical Conference - Panama City Beach, Fl a1a Current flow when flame rod is negative + _ F G

9 Technical Conference - Panama City Beach, Fl Applied AC voltage  a  a Effect = 4  a pulsating DC Effective Flame Signal

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

11 Technical Conference - Panama City Beach, Fl 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

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

13 Technical Conference - Panama City Beach, Fl DC Current vs. AC Current DC CURRENTAC CURRENTAC DROPOUT

14 Technical Conference - Panama City Beach, Fl 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

15 Technical Conference - Panama City Beach, Fl 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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