PRESSURE SWITCHES
A furnace pressure switch is an automatic safety feature located near the motor. It shuts the furnace down if it senses negative pressure created by the draft inducer motor. This protects your home from dangerous backdrafting, which is when exhaust fumes are reintroduced into the system. The pressure switch also guards against gas leaks and prevents the furnace from cycling if there’s a mechanical failure.
Types of Pressure Switches
The design and number of pressure switches your furnace has depends on whether it uses conventional or condensing technology:
A single-stage conventional furnace has one hose leading from the draft inducer fan to the pressure switch.
A single-stage condensing furnace has two hoses on the pressure switch, one to sense pressure at the draft inducer and another for sensing venting pressure at the condensate collector box.
A two-stage furnace may have two pressure switches.
A modulating furnace may have three pressure switches.
Reviews
There are no reviews yet.