Voltage drops
| Oxidation! Corrosion! Poor contact pressure! Burned and pitted
contacts! Etc. All of these can cause high resistance connections which result
in undesirable voltage drops. From the power source, usually a battery or
converter, to the gas valve are a number of components. They are all designed
to provide safe and reliable operation of the furnace. Speaking electrically,
every wire and every device in the current path must perform properly to
prevent intermittent operation. The diagram below shows a "hope you don't see it" scenario.
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