Is it normal? Heater on Air conditioner Fan Runs?

[WanderOne]

Hi,

New Cougar 25RES 5W.

When we turn the Furnace on, the fan on the Air Conditioner Runs. There is a vent adjustment on the AC (ceiling) air coming out one side and getting sucked up on the other?

Is this how the heater is supposed to work? Does the AC on the roof somehow work with the Furnace? I can close the vents on the AC, should I? Seems like it would make a pressure issue.

Me = NU BEE..

[chuckster57]

You probably have the Dometic LED “3 button” thermostat. If so touch the LEFT button until you see FAN displayed. Then use the up or down arrow to cycle it to AUTO. Then when you use your furnace, the AC fan won’t run.

[gearhead]

I think this was the 1st question I asked here.
Put the thermostat on AUX, (scroll through COOL, HEAT, to AUXilary) then furnace.
I think I'm remembering right.
Welcome aboard.
edit add...or what Chuckster just said.

[WanderOne]

You probably have the Dometic LED “3 button” thermostat. If so touch the LEFT button until you see FAN displayed. Then use the up or down arrow to cycle it to AUTO. Then when you use your furnace, the AC fan won’t run.

It is a digital lcd control.

Cool, furnace, fan or off.

Went to fan and set to auto and problem solved.

Thanks