Armstrong Furnace R76700980 Motor

The Armstrong Furnace R76700980 is a 1/4 HP, 208/240 V, 3-speed blower motor supplied as an OEM replacement for the direct-drive blower in compatible Armstrong Furnace and Armstrong Air systems. The photo shows a ventilated black motor shell, a silver end bell with a slotted guard, a long round output shaft, and a bundle of color-coded speed leads that end in white plug-in terminals, with the model label and barcode on top of the shell. The dual-voltage 208/240 V rating means the same motor works on a 208 volt or a 240 volt supply, which is common in commercial and light-commercial buildings as well as homes.

A 3-speed motor has extra winding taps, and each colored lead picks a different speed. The furnace control board or fan relay selects one lead for heating and another for cooling, and a third lead can serve as a middle speed or stay capped off. A lower speed tap produces a slower, quieter airflow, while a higher tap pushes more air across the heat exchanger or evaporator coil. Multi-speed PSC (permanent split capacitor) blower motors of this style normally work with a run capacitor, so check the capacitor against the motor label before reusing it. The R76700980 is an exact Armstrong Furnace part number, so match it to the part number on the original motor label rather than relying on horsepower and voltage alone, since shaft length and diameter, rotation, RPM and mounting vary between motors of the same rating.

When the motor fails you will usually see one of a few symptoms. A motor that hums but will not spin points to a failed run capacitor or seized bearings. A blower that trips the thermal overload and then restarts points to a dirty blower wheel, a clogged filter, or a motor drawing too much current. Squealing or grinding means worn bearings. Before condemning the motor, lock out power and spin the shaft by hand, then ohm the winding between the common lead and each speed lead and compare the readings. Replace the capacitor along with the motor on an older unit. Photograph the lead colors and the speed taps before disconnecting anything, transfer the mounting band or bracket to the new motor, and confirm the rotation matches the original so the blower wheel moves air in the right direction.

Key Benefits

• OEM Replacement: The R76700980 is the Armstrong Furnace original-equipment blower motor, so you are matching the factory part number, not guessing from specs.
• 3-Speed Operation: Separate speed taps let the furnace control run a different airflow for heating and cooling.
• Dual-Voltage 208/240 V: One 1/4 HP motor covers both 208 V and 240 V supplies, which simplifies stocking for service trucks.
• Plug-In Lead Terminals: Color-coded leads with white plug-in terminals make the connection quick to transfer from the old motor.

Common Questions

• What are the ratings of the R76700980? It is a 1/4 HP, 208/240 V, 3-speed blower motor. Check the original motor label for RPM and rotation before ordering.
• Do I need a new capacitor? Multi-speed PSC motors normally run with a run capacitor. Test the existing one, and replace it if it tests weak or is not the microfarad rating on the motor label.
• How do I know it fits my furnace? Match the R76700980 number to the label on the motor you are removing, or contact our team with your furnace model and serial number and we will confirm it before you buy.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.