How to install Dual fans with relay and thermostat switch
How to wire a fan to a thermostat?
3 Jan Do you have a hook up thermostat to fan switch just for the furnace. If they do then you are good to go. The people who owned this house before had it wrong; when the fireplace heat box was warm the heat pump was not disabled and the fan would not run if the thermostat wasn't calling for heat. Good luck. 30 Aug If your system has a separate fan wire, you'll be able to turn your fan on without turning on your heating or cooling system. You can also set a schedule to have your fan turn on regularly to circulate the air in your home. Your Nest Thermostat offers a simple way to turn the fan on whenever you want. Wiring a thermostat to an exhaust fan allows the fan to operate based on temperature. This set-up is especially useful in greenhouses. The thermostat used in this instance, though, isn't your typical thermostat. It's a reverse thermostat, which works by turning on the exhaust fan at a certain temperature then turning it off after.
My thermostat is a Honeywell that goes to an old furnace with a Honeywell furnace controller the board that provides the spark for my gas furnace, among other things like 24V, TH-W, etc. The thermostat is using the red Rwhite Wand green G wires.
R and W seem to be connected to the furnace controller correctly, because my furnace and fan work fine when heat is needed. The G wire is connected in the thermostat, but then goes no where in the furnace. I would really like to be able to turn the fan to ON without having a heating cycle activated fan ON is readily available in the thermostat, it just does nothing because the G wire is not hooked up in my setup.
After looking at all the photos, it looks like the fan is controlled by a fan and limit switch the black thing with a silver dial and three black wires. So basically, the thermostat calls for heat by energizing the TH W terminal on the gas and ignition controller Black Honeywell box with all the wires connected to it. This opens the pilot, turns on the spark, and ignites the main burners.
When the thermostat is satisfied, it removes power from the TH W terminal. This tells the ignition and gas controller to turn off the main burner. To control the fan via the G wire from the thermostat, you're going to have to use a relay to turn on the blower.
Yeah, but that's the easy way. You'll need to run a new wire from the thermostat to the furnace. Instead of the lights you have have he uses hid bulbs mounted in a round Pyrex bread baker with ventiltaion running thru. VictorVIciousFeb 1, The G wire is connected in the thermostat, but then goes no where in the furnace.
You'll energize the coil of the relay using the G wire from the thermostat, and the 24V common terminal from the transformer. You'll have line voltage V or V connected to the common terminal on the relay, and a wire to the blower connected to the normally open NO terminal on the relay.
This ensures that you are safe from harm. Changing wiring could burn out low voltage transformer. Do you have a hook up thermostat to fan switch just for the furnace. Please don't hesitate to contact a local licensed HVAC technician.
Questions Tags Users Badges Unanswered. Join them; it only takes a minute: Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top. Wiring thermostat fan ON. Where do I connect the G wire in the furnace?
Connecting a Thermostat to fan for room ventilation. | Rollitup
What's the make and model of the furnace? The silver label to the far right in the picture above the Honeywell control appears to have the model number, I can't read it in the picture tho. That Honeywell control is a pilot light controller.
Tyson ive posted more photos, including the fan limiter control and fan itself.
Tester i took photos of the only labels i could find, and it does not seem like it is easily identifiable ie, its not trane, lennox, etc. The gas and ignition controller is installed upside down.
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