Section 3
Air Pressure Switch Proving a Fan
Discharge of fan (Plus side of switch)
120VAC signal is sent to the air pressure switch. If the fan is not generating the correct amount of pressure, the 120VAC signal is not allowed to leave the switch. When the fan energizes, and the proper amount of air pressure is detected, 120VAC signal is allowed to leave the switch back to the control panel or other device.
Minus tube
Plus tube
Air Pressure Switch
Air Pressure Switch Electrical Symbol
Inlet of fan (Minus side of switch)
Made with FlippingBook - professional solution for displaying marketing and sales documents online