Pressure Switch Loop Diagram. Switch set point s and continuous output zero and span points are set at the factory as specified by the customer. A pressure switch is designed to sense the negative pressure created by the draft inducer motor during the furnace startup and to shut down the furnace ignition if the air pressure is inadequate.
Basics 5 mcc one line. Basics 1 plant 1 line. A pressure switch is designed to sense the negative pressure created by the draft inducer motor during the furnace startup and to shut down the furnace ignition if the air pressure is inadequate.
The pressure switch on a furnace may fail or get stuck in an open position and there are few simple checks you can complete before testing the switch.
Without the use of the switch the water pump would always be on or off. Lower sensor branch wiring diagram junk yard zetec oil pressure switch wiring scannerdanner forum scannerdanner 2005 gp gxp ls4 oil pressure pigtail wire colors ls1tech. Basics 5 mcc one line. A switch loop single pole switches light dimmer and a few choices for wiring a outlet switch combo device.
