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The Packard PHL503 is a plenum thermostat designed to help manage furnace safety. It opens when the plenum area temperature exceeds one hundred degrees Fahrenheit and closes when the temperature cools to one hundred fifty degrees Fahrenheit. This thermostat aids in preventing furnace overheating by shutting down the furnace until the temperature returns to a safe level.
This thermostat is essential for maintaining safe operation of heating systems, especially in high-temperature scenarios.
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