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Quick specs
Horsepower
1/3 HP
Voltage
208/230V, 1-phase
Motor Type
ECM, variable speed
Fits
Rheem RA1636 condensers
Replaced By
51-106394-06
Not sure this fits your unit?
Call us with your model number and we'll confirm the right part before you order.
RHEEM RUUD OEM 1/3 HP Condenser ECM Fan Motor 51-102728-21
Genuine OEM ECM Motor·1/3 HP Variable Speed
$529.44
-
- Free shipping — most items ship by the next day
Licensed HVAC technician required. Must be installed by a certified professional. Improper installation voids the manufacturer warranty.
Secure payment
VISA MC AMEX DISC PayPal Affirm CHECK
RHEEM RUUD OEM 1/3 HP Condenser ECM Fan Motor 51-102728-21
Licensed HVAC technician required. Must be installed by a certified professional. Improper installation voids the manufacturer warranty.
Need help? (888) 292-0874
- Free shipping — most items ship by the next day
Secure payment
VISA MC AMEX DISC PayPal Affirm CHECK
In stock
In most items, small items ship same day. Complete systems ship next business day.
$529.44
-
Need help? (888) 292-0874
- Free shipping — most items ship by the next day
Secure payment
VISA MC AMEX DISC PayPal Affirm CHECK
Quick specs
Horsepower
1/3 HP
Voltage
208/230V, 1-phase
Motor Type
ECM, variable speed
Fits
Rheem RA1636 condensers
Replaced By
51-106394-06
Not sure this fits your unit?
Call us with your model number and we'll confirm the right part before you order.
RHEEM RUUD OEM 1/3 HP Condenser ECM Fan Motor 51-102728-21
The 51-102728-21 is a genuine Rheem / Protech / Ruud OEM Electronically Commutated Motor (ECM) designed for outdoor condenser fan applications in residential and light commercial air conditioning and heat pump systems.
Key Features
- 1/3 HP with variable speed operation (approximately 767 RPM)
- 208-230V, 50/60 Hz, single phase
- ECM technology for precise speed control and high efficiency
- Direct drive design
- Robust construction built for continuous outdoor duty in harsh weather conditions
- Low amperage draw (typically 3.5 FLA)
- Quiet and smooth operation with soft start/stop capabilities
Benefits
- Superior Energy Efficiency: ECM motors use significantly less electricity than traditional PSC motors (up to 30% more efficient at lower speeds), helping reduce monthly energy bills.
- Enhanced System Performance: Variable speed allows the motor to optimize airflow for better cooling/heating efficiency and improved comfort.
- Longer Lifespan & Reliability: Reduced stress on components due to soft starts, lower operating temperatures, and precise control.
- Quiet Operation: Ideal for residential installations where noise levels matter.
- Perfect OEM Fit: Direct replacement ensures compatibility and maintains system warranty where applicable.
Compatibility
This motor is specifically engineered for select Rheem and Ruud models, including:
- RA1636AC1NB
- RA1636AJ1NA
- RA1636AJ1NB
- And other compatible Rheem Classic Series 3-ton units (verify with your unit’s model number and service literature before ordering).
Note: This is a discontinued or limited-availability OEM part in some channels as of 2026. Always match the exact part number to your equipment for proper fit and performance. Professional installation recommended for HVAC electrical components.
This high-quality OEM motor is the ideal choice for restoring peak efficiency and reliability to your Rheem or Ruud air conditioning system.
Key features
- Genuine OEM ECM Motor — Rheem, Ruud and Protech condenser fan
- 1/3 HP Variable Speed — efficient outdoor airflow
- AC and Heat Pump Use — residential and light commercial
- Direct Replacement — part 51-102728-21
Why homeowners choose NAW
Genuine OEM parts
Every part we sell is the real thing — authorized, factory-genuine, and backed by the full manufacturer warranty.
Easy online ordering
Find your part by model number, add to cart, and get it delivered to your door — no middleman, no markup.
30-day hassle-free returns
Ordered the wrong part? Send it back within 30 days.
Help when you need it
Not sure if this is the right part? Call us at (888) 292-0874 and we’ll help you find the correct replacement.
Customer reviews
What buyers are saying
Verified reviews from customers who purchased this product.
5.0
4 verified reviews
HJ
Henry J
I couldn’t believe the power and quiet performance of the RHEEM RUUD OEM CONDENSER ECM MOTOR 51-102728-21—it completely exceeded my expectations. For this price, getting such top-tier efficiency and build quality feels like a steal!
BF
Bill F
I was blown away by the performance of the Rheem Ruud OEM Condenser ECM Motor—it’s incredibly efficient and operates flawlessly! With an unbeatable price and top-notch reliability, this motor is an absolute game-changer for any HVAC setup.
HH
Henry H
I’m thrilled with the RHEEM RUUD OEM Condenser ECM Motor 51-102728-21! It delivers outstanding performance at a fantastic price, making my HVAC system run smoother and more efficiently than ever.
RH
Robert H
The RHEEM RUUD OEM CONDENSER ECM MOTOR 51-102728-21 significantly boosted my HVAC system’s efficiency, ensuring smooth and quiet operation throughout the hottest days. The price was incredibly reasonable for such top-notch performance, making it a fantastic investment for anyone looking to upgrade their system.
