How Does a Furnace Pressure Switch Work?
Safety All pressure switches in a furnace are placed there for safety purposes. Generally the single pole switches allow electrical current to flow through when the pressures are at an operational level. When something fails or pressures reach an unacceptable high level or point, the switch will shut off the electrical power in the circuit. Typically, most pressure switches are wired so all of the furnace’s electrical control power will travel through every safety switch. This type of wiring is called a series circuit. This ensures that all power is disabled regardless of the switch that trips out the electrical power. In most cases when a pressure switch trips out or activates, it must be physically reset by the operator or homeowner before the furnace will operate. Air and Water Furnaces may contain several different types of pressure switches. The first type of pressure switch can be one that monitors the air movement or air pressure in both the circulation fan and the combustion ar
