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Forced-air Furnaces: The What, Why, and How

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Further reading 1

Without a program counter, how does a jukebox remember the next step? →Release the jukebox button and the record keeps moving. Follow the holding circuit, then compare a pinball reset with a furnace pressure switch to find where state lives and what lets a sequence advance.This video helps answer · After a start command, which feedback unlocks the next step?

Caption notes

After energizing the inducer, the furnace controller waits for a pressure-switch transition. A separate limit switch protects against overheating. Issuing a start command, confirming airflow and allowing combustion to continue are three different decisions.

Archived captions (transcription method unspecified) ↗
Original passages · 2
looks for the output from this pressure switch to change.
Forced-air Furnaces: The What, Why, and How · ▶ 13:40–13:47
it’s designed to protect against overheating.
Forced-air Furnaces: The What, Why, and How · ▶ 17:59–18:04

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