Change blower speed tap

What is going on

Change the blower speed tap on the integrated control to match the heating or cooling speed needed.

Likely causes

• Temperature rise outside the range on the rating plate
• Cooling airflow too low or too high
• Duct changes after install
• Noisy or drafty registers from too much speed

Check in this order

1. Turn off electrical power to the furnace, because the control board has line voltage nearby.
2. Remove the blower access panel.
3. Disconnect the existing speed tap from the control board speed terminal.
4. Insulate any unused motor leads so they cannot touch metal.
5. Place the unused speed tap on the integrated control PARK terminal or insulate it.
6. Select the speed from the blower speed chart on the unit wiring diagram.
7. Connect the selected speed tap to the control board speed terminal.
8. Reinstall the blower access panel.
9. Turn on power and recheck the temperature rise against the rating plate.

More furnace guides

• Annual planned service inspection
• Annual service checklist
• Blower access panel and carbon monoxide hazard
• Burner assembly cleaning
• Check temperature rise and adjust blower speed
• Check venting and combustion air on non-direct vent installs