Trane XR95 - How To Adjust Fan Speed? - HVAC - DIY Chatroom Home Improvement Forum

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Old 09-16-2011, 07:36 PM   #1
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Trane XR95 - how to adjust fan speed?

Hi guys,

I had a new furnace installed (Trane XR95 - TUH1B080A9421A - single stage furnace) for my home. I find the fan quite loud and would like to lower the setting if possible (it has 4 settings). I look through the manual but am confused. Could any explain how I can achieve this?



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Old 09-16-2011, 09:54 PM   #2
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Another common place with a schematic is on the back of the blower fan door. Most require that you open a box (2 screws?) with a wiring harness for the fan. 3 of the wires will likely terminate with just a twist on cap. But the 'real' one will be the one connected with a twist on cap to the fan motor.

If the schematic is on the door, note the color coding of wires and then swap, in your case, to a lower speed. Most high is usually for A/C.


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Old 09-17-2011, 08:16 AM   #3
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If you lower the blower speed make sure you check the temperature rise across the heat exchanger or you may damage it. There should be a specification decal on the inside of the furnace adjacent to the gas valve. This will tell you the maximum temperature rise for your unit.
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Old 09-17-2011, 05:10 PM   #4
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Before lowering your fan speed. Check the temp rise across the heat exchanger. if its high already. then lowering the blower speed may increase it above a safe level for the heat exchanger. And cause you lots of no heat problems. Or burn out your heat exchanger.
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