The Dayton 1TDR8 is a direct-fit replacement blower motor engineered to restore proper airflow in HVAC, ventilation, and commercial heating systems originally built around the Dayton 2C917. With a 358 CFM rated output, dual-speed operation at 1350/1530 RPM, and ball bearing construction for long service life, this motor is a reliable drop-in solution for service technicians and facilities maintenance professionals.
When a blower motor fails in a forced-air unit, downtime is costly. The 1TDR8 is purpose-built to replace the Dayton 2C917 without custom fabrication or adapter hardware. The mounting flange dimensions, shaft diameter, wheel size, and rotation direction all match the original specification, so you can swap the motor and return the system to service quickly.
This motor is also catalogued under NBK Parts number 20517, making it easy to cross-reference across distributor systems. If your parts lookup returns 20517 or 2C917, the 1TDR8 is the correct replacement unit.
Runs at 1350 RPM (low) or 1530 RPM (high) on a single motor, giving the system two distinct airflow modes without a separate motor or drive assembly.
Precision ball bearings reduce friction and heat buildup, supporting longer service intervals compared to sleeve-bearing designs in continuous-duty applications.
Built-in thermal overload protection shuts the motor down if operating temperatures exceed safe limits, protecting the winding from burnout during restricted-airflow events.
Rated for both 50 Hz and 60 Hz power supplies at 230V, making this motor suitable for domestic and international equipment operating on single-phase 230V circuits.
The 1TDR8 uses clockwise rotation as viewed from the inlet (wheel) side. Verify your existing motor's rotation direction before ordering -- installing a counter-clockwise motor in a clockwise application will reverse airflow and reduce system performance significantly. If your original motor plate is missing, check the direction of the blower scroll housing; it is designed to work with a specific rotation direction.
This is a 230V single-phase motor drawing 0.40A at low speed (1350 RPM) and 0.50A at high speed (1530 RPM). Current draw is low, but the circuit feeding this motor must be rated for 230V single-phase with appropriate overload protection sized to the motor's nameplate amperage. Class B insulation supports operating temperatures typical of forced-air HVAC environments.
The integrated or associated blower wheel (6-1/8 in diameter, 1-7/8 in wide) moves up to 358 CFM through a 5-1/4 in inlet diameter outlet assembly measuring 4-1/4 in tall x 3-3/4 in wide. Maximum inlet air temperature is 104 deg F (40 deg C) -- do not use this motor in applications where incoming air routinely exceeds this temperature without verifying thermal derating.