furnace fan speed question

Erich Ruger

I am useing a Trane XV90 gas furnace in "fan" mode to circulate heat from a wood furnace. I would like to speed up the circulator fan speed. The Installer's guide does not go into detail on the fan wiring. I would like to know if this is possible? With out screwing up the furnace and having my wife kill me.

Thanks

Erich.

Pat Clark

Fan speed on XV Furnace

Erich

I can help you with that but will need more information.

I will need the actual model # of the furnace, the square footage of the heated space and is the fan on continuous (without the burner on) when you are trying to utilize heat from the wood furnace. Is the wood furnace ducted with the XV furnace or are you just trying to circulate the air through the house while you use the wood furnace?

You can respond here or email me @ pclark@bellcomfort.com

The fan is adjusted by a series of dip switches, which I will be able to tell you once I have the information.

Pat Clark

John Mills_3

Do this

When you energize G, it runs at 1/2 cooling speed. When you energize Y, it runs at normal cooling speed. If you have Comfort R turned on, it slowly ramps up. That can be disabled by turning DIP switches 5 & 6 off. But to get constant fan to run faster, you have to jump from G to Y on the board. To avoid having the A/C on, you have to remove Y from the stat and outdoor unit and just wirenut together.

Erich Ruger

did that

John thanks for the info

I moved dip switches 3 and 4 to ON and am getting all kinds of air flow. since this is not a setting for the furnace will it hurt it at all.

Thanks

Erich.

Steve Miller

Not so fast

Steve Miller

another thing

Too high of fan speeds during the heating cycle could cause problems. Not so much with 90%'ers with a 80% furnace, you could cool the flue gases down and cause condensate that could damgage your vent and induced blower. Just make sure your temp rise is within range of the furnace specs and you'll be good to go.

Steve M

John Mills_3

Those

are your cooling speeds. 1-4 set tons and airflow per ton. If you have cooling, you really want to shoot for around 400 CFM per ton, a little more in dry climate, a little less in humid climate.