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M0081903R Nordyne 208-230v 3/4hp 1050rpm Motor

M0081903R Nordyne 208-230v 3/4hp 1050rpm Motor

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M0081903R Nordyne 208-230v 3/4hp 1050rpm Motor

Description

The M0081903R is an OEM electronically commutated (ECM) blower motor—Q7 series—designed for Nordyne/Intertherm/Miller furnaces requiring high-efficiency variable-speed airflow. It delivers ¾ HP (0.75 HP) at 1050 RPM on 208–230 VAC single-phase power. Integrated speed-control electronics eliminate the need for external capacitors, and dual “end-cap” connectors allow easy selection of factory-set airflow curves. The motor drops straight into the OEM mounting bracket and accepts a standard ⅝″-to-½″ shaft adapter (not included).


Key Features

  • Official Nordyne part number M0081903R

  • Permanent-magnet ECM design for precise speed control and high efficiency

  • Voltage: 208–230 VAC, single-phase, 50/60 Hz

  • Horsepower: ¾ HP; Speed: 1050 RPM at full-load

  • Dual end-bell speed selectors (Q7 “E” cap for ECM interface)

  • Shaft diameter: ⅝″ (with optional ½″ adapter sleeve)

  • Plug-and-play mounting ears and keyed wiring harness

  • Fully enclosed, thermally protected, with anti-vibration mounts


Compatibility

Replaces legacy part M0081903 and fits any Nordyne, Intertherm, or Miller furnace originally equipped with the Q7 ECM blower motor:

Brand Typical Models/Series
Nordyne M4ECM, M6ECM, M7ECM series
Intertherm Miller gas/electric furnaces with ECM blower
Miller ECM-equipped downflow/upflow furnaces

Always verify your furnace data-plate for motor code “Q7” or part number M0081903 before ordering.


Installation & Setup Tips

  • Confirm Rotation & Orientation With the shaft pointing up (typical upflow), the motor spins clockwise. If installed shaft-down, rotation appears reversed—ensure ductwork and wheel orientation match.

  • ECM Controller Compatibility Requires an ECM-capable control board (e.g., Nordyne SYSTX or equivalent). Standard 24 VAC boards without ECM outputs will not operate this motor.

  • Wiring Harness Use the OEM three-wire connector; observe color-coded leads for line, neutral, and speed-control signal.

  • Shaft Adapter If your blower wheel bore is ½″, install a ½″ adapter sleeve over the ⅝″ shaft before mounting the wheel.

  • Vibration Isolation Verify anti-vibration grommets and mounting feet are in good condition to prevent noise and premature bearing wear.