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Genteq EM3739F Motor

Genteq EM3739F Motor

Genteq

The Genteq EM3739F Condenser Fan Motor is a PRO-E Series 3/4 HP, 460V, single-phase, 60 Hz motor that turns at 1075 RPM on a single speed. It is a Permanent Split Capacitor (PSC) design built for air-over duty, meaning the condenser fan's own airflow carries the heat away from the motor. The shell is Totally Enclosed Air Over (TEAO) on a 48Y frame about 5.6 inches in diameter, with a rated draw of 2.8 amps and an output of 0.56 kW. The same motor also circulates under the Century EM3739F and EconoMaster EM3739F names, so all three designations point to this one part.

Construction centers on a rolled steel shell, ball bearings at both the drive end and the opposite end, a six-pole winding and Class F insulation rated for a 70°C maximum ambient. Automatic thermal protection is built in and resets itself once the winding cools. The shaft is 1/2 inch in diameter, flatted, with a 6 inch extension for the fan hub, and the overall motor length is 12.17 inches. Mounting is by extended studs on the lead end, mounting holes in the shell or a belly band (band not included). Rotation is reversible, the service factor is 1.0, and the motor can be mounted in any orientation. It is designed to run with a 15 MFD, 370 VAC run capacitor, which is not supplied with the motor.

Matching horsepower and speed is not enough to call a condenser fan motor interchangeable. Check the 460V rating, the 48Y frame, the 1/2 inch shaft diameter and length, the rotation direction and the wiring against the original nameplate and connection diagram. The nearby numbers are different motors: EM3738F (1/2 HP), EM3737F (1/3 HP) and EM3736F (1/4 HP) are lighter 460V models, while EM3731F is the 3/4 HP version for 208-230V. The Genteq catalog number 3739 is also 3/4 HP, 460V and 1075 RPM, but it is a separate motor with a longer body and a lower 2.03 amp rating, so compare shaft length and fit before swapping one for the other.

A failing condenser fan motor usually shows up as a unit that hums with the blade slow or not turning, then trips on high head pressure or the compressor's own overload. Before condemning the motor, test the run capacitor against its 15 MFD rating, confirm the contactor is pulling in and the full 460V is reaching the leads, spin the shaft by hand to feel for bearing drag, and check the windings for continuity with no leakage to the shell. Because the thermal protector resets on its own, a motor that runs for a while, shuts off and later starts again is often overheating from a weak capacitor, a worn bearing or a plugged condenser coil rather than a random fault. Lock out the power and discharge the capacitor before touching any leads, and fit a rain shield or drip loop if the shaft will point upward.

Key Benefits

  • Correct Voltage Match: Built for 460V single-phase condenser circuits, so it suits units whose nameplate calls for 460V instead of the 208-230V models such as EM3731F.
  • Built for Outdoor Duty: A TEAO rolled steel shell, double ball bearings and Class F insulation rated to 70°C ambient stand up to the heat and weather at the condenser.
  • Self-Resetting Protection: Automatic thermal protection shuts the motor down before the winding is damaged and resets after it cools.
  • Flexible Mounting and Rotation: Extended studs, shell mounting holes and belly band mounting, with reversible rotation so the fan can turn clockwise or counterclockwise as the unit requires.

Common Questions

  • What run capacitor does the EM3739F use? A 15 MFD, 370 VAC run capacitor, sold separately. A weak or swollen capacitor causes slow starts and overheating, so it is worth testing or replacing it whenever the PSC motor is changed.
  • Is the EM3739F the same as the Genteq 3739? No. Both are 3/4 HP, 460V and 1075 RPM, but the EM3739F draws 2.8 amps with a 12.17 inch overall length and 6 inch shaft extension, while the 3739 draws 2.03 amps with a 13.31 inch length and 6.42 inch extension.
  • Can the EM3739F run on a 208-230V condenser? No. It is a 460V motor only. For a 3/4 HP, 1075 RPM motor on 208-230V, look at the EM3731F.

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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.