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what is the difference between Lean-Lean Positive and Lean-Lean Negative?
Could you please elaborate.
Could you please elaborate.
If you check your Control Spec. you should find the temperature to go to Premix, this is Lean-Lean positive, there also be a deadband for this setting so Lean-Lean negative is the premix temp. minus the deadband. If you don't make the transfer to Premix and/or run through to Extended Lean-Lean the Negative temperature is where you need to come back down to to attempt to re-stage to Premix.
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