Lennox 19S83 Control Board 30067439 890 Built with a nickel plated forged Built with a nickel plated forged brass body and a 316 stainless steel ball and stem Precision Calibration: Narrow 40 degree differential (190°F Open 150°F Close) ensures accurate furnace overheating protection without premature tripping What is the purpose of the blue wire in the 19S83 kit 270 seconds) to maximize latent heat recovery
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Lennox 19S83 Control Board 30067439-890 Built with a nickel-plated forged