Fan Only Thermostat

From what i read this means im missing an extra wire.

Blower fan cpu. I cant run my fan unless im on heat or cool. To change the thermostat fan modes. Why the blower fan runs only in the man on switch but wont run on auto.

The one i bought is a 4 wire type and has a fan only option. Wiring the fan only option is not difficult as long as the. Press the fan button to cycle through auto on and circulate.

Example manual fan on there is no controll voltage to the gas valve that comes from the thermostat. The fan will run continuously. I had an old thermostat that i was able to set to fan only.

No issues at all with my system works as should. If any calls for heatcool occur in that one hour period that run time is subtracted from the overall run time for the fan for that hour. If your systems fan speed can be controlled with your thermostat running the fan at a higher speed wont make your home heat faster and it can increase your electricity costs.

I only want this option to help circulate air in my house. You can set the circulating fan feature from the thermostat or the sensi app. The fan speed typically cant be controlled by a thermostat.

If you set the circulating fan to 50 the fan will run 30 minutes every hour. Most thermostats have a setting where you can run the hvac fan only but the customizations are rather limited and you likely can only turn it on and off. This qa were posted originally at fan on auto man thermostat switch faqs.

It looks like i either need to run a wire or two from the fan to the new thermostat honeywell ct51a or maybe attach a jumper or two. Thermostats provide a variety of options to control the temperature and comfort level of your home. Fan works only if thermostat set to fan on.

The fan will run only when the heating or cooling system is on. Thermostat is new honeywell basic model not smart. The vast majority of fans only have onoff options.

But thermostats can also be used for home air circulation and filtration with the fan only setting helping to save on your energy bills. Fan will work only when thermostat set to fan on. Installing a switch to turn the fan on at the furnace a standard snap switch rated at 2x the motor fla and wired across the contactor is what i have done.

I have an older furnace with only 2 wires at the thermostat white and red. I want to be able to turn it on fan mode only. Cycle through the modes until the desired mode is displayed and leave it to activate.

How to install and set up the nest thermostat. This turns the fan on but the heat only turns on when the thermostat calls for heat. I had my nest professionally installed recently by an hvac technician who also installed a new furnace.

The original thermostat was a 2 wire type.