Variable speed fan Bryant +80W

[Hague]

I’m have installed a nest Model 1.4 learning thermostat on my gas fired Variable Speed Bryant forced air unit. The fan seems to only run on turbo speed. Is there a setting to allow the variable speed option to work? I’m only running heat now for a couple of hours in the morning time. Could it be that the temperature in my home never gets a chance to balance out during the two hour morning run time so it just runs turbo speed?

[CoolingWizard]

The fan speed is control by the Furnace Integrated Control board.  If however, the thermostat sends a call for heat and a call for the blower at the same time, the variable speed control is overridden. Make sure in your thermostat settings that the Blower, the G wire, is not activated on a heating call.  

Ken, The AC Cooling Wizard

[Hague]

 

[CoolingWizard]

If you have plugged a wire to the OB, you need to set the setting of that wire. Tap the OB and define its function.

[Hague]

This is what I’ve got.  

[Hague]

 

[CoolingWizard]

You have a 2-stage heating system and the Brown wire is connected to W2 in your furnace control board.  You need to define the O/B as state 2 Heat. 

[Hague]

thank you for your help!

[Markjosephp]

Hello folks,

I wanted to ensure that everything was covered here.

Thanks for helping here, Ken.

@Hague, I hope you've got the answer you're looking for. If you're still in need of assistance, feel free to let us know.

Regards,

Mark

[Hague]

Resolved 

[Markjosephp]

Hi Hague,

Awesome! I'm happy to hear your problem has been resolved. It appears that we can mark this one as complete, so I'll close this thread in 24 hours unless I can assist you in any way.

Regards,

Mark