Furnace fan

[whiteste]

I own a 2015 Sunseeker 2300. Can I run the furnace fan only, no heat? I can run the A/C fan only, but I want to run furnace fan only

[kenandterry]

You can do anything....if you’re good at DIY or have deep enough pockets to have someone do it for you.

Not sure what you’re trying to do, but all you need to do is supply the fan motor with 12 volts and ground.
Whether you cut into the wiring direct or put in a switch, it’s all the same.
12 volts and ground.

[whiteste]

I am putting in a portable heat pump for heat

[ssande]

Originally Posted by whiteste

I own a 2015 Sunseeker 2300. Can I run the furnace fan only, no heat? I can run the A/C fan only, but I want to run furnace fan only

I have the same need. I run an electric baseboard heater during cool temperatures and would like to be able to run the heater fan to draw the warm air up to the front bathroom (PUMA TFU21 Toy Hauler). Currently, to run the heater fan you need to have the heat on. I'd rather not reinvent the wheel if someone else has done this and avoid tearing into things which usually results in more work fixing the shoddy workmanship you run across.

[5picker]

Originally Posted by ssande

I have the same need. I run an electric baseboard heater during cool temperatures and would like to be able to run the heater fan to draw the warm air up to the front bathroom (PUMA TFU21 Toy Hauler). Currently, to run the heater fan you need to have the heat on. I'd rather not reinvent the wheel if someone else has done this and avoid tearing into things which usually results in more work fixing the shoddy workmanship you run across.

I've not seen a 'from the factory' furnace fan only option.

The reasoning for using A/C fan only when heating (and an option on some units when running the furnace) is that warm air rises and the A/C fan can easily distribute the warm air more efficiently than trying to suck it back down toward the floor and into the furnace intake.

If you want to do this with the furnace fan, you'll need to wire in your own control circuitry.

[ssande]

Originally Posted by 5picker

I've not seen a 'from the factory' furnace fan only option.

The reasoning for using A/C fan only when heating (and an option on some units when running the furnace) is that warm air rises and the A/C fan can easily distribute the warm air more efficiently than trying to suck it back down toward the floor and into the furnace intake.

If you want to do this with the furnace fan, you'll need to wire in your own control circuitry.

Thanks for your reply! The thermostat would lead you to believe you can select the manual fan in either cooling or heat mode, but it doesn't work that way. Your reply makes sense for using the AC fan, so I think I will just control the furnace fan from that same wire with a diode so I don't backfeed anything. That way both the furnace and AC fans will go on when the manual fan mode is selected.

Scott