The Dayton 1TDU2 is a direct replacement centrifugal blower motor engineered to swap in where the Dayton 4C831 was installed. Dual-voltage operation (115V or 230V), 50/60 Hz compatibility, Class B insulation, and ball-bearing construction make this a reliable workhorse for HVAC air handling, ventilation, and exhaust applications in commercial, industrial, and large RV or marine service environments.
If your Dayton 4C831 blower motor has failed or is showing signs of bearing wear, the 1TDU2 is the correct replacement. It shares the same housing footprint, shaft diameter, wheel dimensions, and dual-voltage wiring configuration, so you can swap it in without modifying the existing cabinet or ductwork.
Also sold and cross-referenced as NBK Parts 20531, so this part may appear under either number depending on your supplier. Confirm your replacement using the housing dimensions and flange size listed in the specs to the right before ordering.
Moves 1202 CFM to handle demanding ventilation loads in large cabinets, air handlers, or roof-mount HVAC units.
Wires for 115V or 230V operation. Compatible with both 50 Hz and 60 Hz power systems for domestic and international use.
Ball bearings extend service life versus sleeve-bearing designs, especially in continuous-duty or high-temperature environments.
Built-in automatic thermal overload protection shuts the motor down if it exceeds safe operating temperature, then resets automatically.
The 1TDU2 supports two operating voltages using a standard dual-voltage motor wiring configuration. At 115V/60 Hz, the motor draws 7.3A on the low-voltage winding and 3.7A on the high-voltage winding. At 50 Hz, draw is 4.8A (115V) or 2.5A (230V). Select the correct winding tap to match your panel voltage before energizing.
The forward-curved centrifugal blower wheel measures 8-1/4 in diameter x 5-1/4 in wide, matched to a 7-inch round inlet. The outlet opening is 7-1/8 in wide x 5-1/2 in tall. Overall housing dimensions are 11-7/8 in wide x 14-7/8 in tall x 13-1/8 in deep -- confirm these against your existing unit before ordering, as similar-looking blowers may have slightly different housing sizes.
The mounting flange measures 5-1/16 in wide x 5-5/8 in tall. The motor shaft is 12 mm diameter, and the wheel rotation is clockwise when viewed from the inlet side. Verify rotation direction matches your application before installation.
Class B insulation is rated for continuous operation up to 130 deg C winding temperature rise. The maximum allowable inlet air temperature is 104 deg F (40 deg C) -- do not use this motor in high-temperature exhaust streams above this limit without verifying thermal compatibility. Class B is standard for commercial HVAC duty cycles.