Furnace Gas Valve Pressure Test

Turn the gas off.

Furnace gas valve pressure test.

Turn off the furnace at the wall control. Using a meter test if the switch closes. Locate the gas valve. A multimeter will be needed to test the switch for continuity.

Screw back in the gas valve plug using a small amount of pipe dope. 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. Wait for the unit to cool if it has been in use. Pull the wires off.

Then screw in your manometer. How do you test the gas furnace pressure switch. Take out the bolts in the service panel on the side of the furnace using a nut driver. 52 61 good unit by just another buyer worked great for checking gas flow on a couple heaters that we have.

Turn on the furnace and start it. Locate the pressure tap on the gas valve and unscrew the plug. Some gas valves will have a pressure tap on both sides while some only have one on the furnace manifold side. Testing a gas line for leaks do it yourself how to fix a leaky gas valve and pressure testing on home natural gas lines gas company wont turn on my gas due t.

The gas valve will have a pressure tap located on it. The manometer will give the reading in water column in inches. To test the pressure switch use a multi meter and measure the continuity of the switch as it opens and closes. To do this the pressure switch wires are removed and the furnace turned on.

Basically the switch needs to be tested to see if it is closing when the pressure diaphragm pulls in. How to check the furnace gas valve with a multimeter step 1. Turn gas on and.