Honeywell S437A1025 Sail Switch, 1 SPST with Case and Cover
S437 Sail Switches respond to the air velocity in heating or warm air ducts, such as used in farm crop dryers. The switch completes a 24V or line voltage burner control circuit only when the blower or fan has produced a preset air velocity.
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How to test an Air Proving or Sail Switch
Honeywell Sail Switch
www.supercoolsliderule.com -- This video tutorial demonstrates how to test an air proving or sail switch.
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