Carrier HK660006 Pressure Switch Kit Els PW 17895 What does 'Close on Fall'

What does 'Close on Fall' mean for this specific model

a 72-inch or 96-inch sampling tube should be used and trimmed if necessary

Can this gauge cock be used for steam systems

The 586WA-8ST (WA series) is the standard version without an access fitting

Carrier HK660006 Pressure Switch Kit Els PW 17895 What does 'Close on Fall'The Carrier HK660006 Pressure Switch Kit serves as a critical safety component for furnace and air handler assemblies, designed to verify proper inducer motor operation and adequate venting before ignition. This genuine OEM replacement part is the direct replacement for HK02AC027, resolving issues associated with the older, obsolete switch design. In a typical furnace sequence, this HVAC pressure switch monitors the pressure differential created by