Furnace fan limit switch diagnosis & repair: How to Test
Watch the oil or gas burner: The furnace oil or gas burner should turn ON and subsequently the FAN LIMIT control should turn the burner back OFF when the temperature in the supply air plenum reaches the FAN LIMIT set point. Watch the dial on the fan limit switch moving to confirm its operation.
Honeywell L4064B Combination Fan and Limit Control: How to
Automatic furnace fan: Pull the white fan button "OUT" to the AUTO to cause the fan to cycle on and off automatically in response to temperatures sensed by and set on the fan limit control dial. After completing these control settings be sure you test the combination fan and limit switch for safe and proper operation.
Furnace Fan Limit Switch: how does a Fan/Limit Switch Work
The fan limit switch contains a bi-metallic spring (shown at left) which is inserted into the warm air plenum of the heating furnace. As the air in the furnace plenum warms up the bimetallic spring expands, turning a gear which turns the fan limit control dial (shown in the photo above).
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Other Automatic Controls:Combination Fan and Limit Control Fan & Limit Switch Q&A-5 Furnace fan limit control Bryant Furnace: Bryant Furnace Limit Switch Location Instructions, wiring diagrams and troubleshooting your Coal Furnaces, Wood Furnaces, and Multi-Fuel Furnaces Gas and Oil Central Heating Systems
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