Gas Furnace Furnace Pressure Switch Diagram

Before changing out an inducer motor or pressure switch keep in mind that a kinked hose clogged flue pipe or anything that stops the inducer motor from pushing air out the vent will cause a good pressure switch not to work.

Gas furnace furnace pressure switch diagram.

Example gas furnace pressure switch on amazon lefoo lf31 air furnace differential heating ventilation pressure switch 100pa. Gas furnace wiring diagram pdf wiring diagram for a gas furnace valid gas furnace wiring diagram pdf wiring diagram. Watch this and we might be able to get it working again. On a call for heat the inducer should start.

The pressure switch also guards against gas leaks and prevents the furnace from cycling if there s a mechanical failure. If you have found that your pressure switch is not letting your furnace come on. Assortment of gas furnace wiring diagram pdf. The board first checks the switch to ensure it is open prior to inducer call.

The minimum upward slope from the furnace is 1 4 inch of rise for every foot of. A gas furnace pressure switch closes to allow current to pass through and start the ignition of the furnace. This video is part of the heating and cooling series of training videos made to accompan. As noted above the pressure switches used for gas furnaces are almost always normally open.

Similar to an obstructed air intake pipe check for obstructions such as nests or leaves but also check for inadequate sloping of the vent pipe and make sure the exhaust pipe is supported every 5 feet of its horizontal run. The pressure switch can also be tripped by an obstructed exhaust flue gas vent pipe. If it is closed prior to call it will go into fault because the switch is clearly jumpered the circuit shorted or the switch. While the inducer is running short the wires going to the pressure switch with a jumper.

Today i am focusing on the pressure switch used in gas furnaces that prove inducer fan operation. If the pressure switch is stuck it does not send enough power to the inducer and therefore the ignition sequence does not begin. Remove the wires from the pressure switch. Types of pressure switches the design and number of pressure switches your furnace has depends on whether it uses conventional or condensing technology.

This is a simple one about wiring the power to a gas or oil furnace. Wiring diagram pictures detail. Simply put your gas furnace is made up so that when you power the furnace and adjust your thermostat the control board gets a call for heat.