Gas Heat ESCO Practice Exam

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A standing pilot furnace has a bi-metal fan/limit control. What are the factory settings?

Fan on 100 F / Fan off 80 F / Limit cut out 180 F
Fan on 150 F / Fan off 130 F / Limit cut out 220 F
Fan on 125 F / Fan off 110 F / Limit cut out 200 F
Fan on 135 F / Fan off 115 F / Limit cut out 210 F

The correct answer is: Fan on 100 F / Fan off 80 F / Limit cut out 180 F

In a standing pilot furnace with a bi-metal fan/limit control, the factory settings govern when the fan turns on, turns off, and when the temperature limit triggers the furnace to shut down for safety. The correct factory settings in this scenario are Fan on at 100°F, Fan off at 80°F, and Limit cut out at 180°F, as described in option A. These settings ensure that the fan starts circulating warm air from the furnace at 100°F, stops when the temperature drops to 80°F, and shuts down the furnace if the temperature reaches 180°F to prevent overheating. This arrangement helps in maintaining a comfortable temperature inside the space while safeguarding against excessive heat.