What are the factory settings for a standing pilot furnace with a bi-metal fan/limit control?

The factory settings for a standing pilot furnace with a bi-metal fan/limit control typically include specific temperature settings for fan operation and limit cut-out. In the selected answer, the fan on setting at 125°F and the fan off setting at 110°F provide a reasonable range for typical operation in moderate heating circumstances. This means that when the furnace reaches 125°F, the fan will activate to circulate air and ensure even heating throughout the space. When the temperature drops to 110°F, the fan will turn off, allowing for efficient operation and energy savings when the heating demand is lower.

The limit cut-out setting of 200°F ensures that should the temperature within the furnace rise excessively, it will shut down to prevent overheating and potential damage, making it a critical safety feature.

These settings are designed to balance both efficiency and safety in a standard standing pilot furnace. Understanding these default parameters is crucial for effective trouble-shooting and operation of gas furnaces.