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Dayton 1/4 hp open-frame blower motor with 6-inch shaft

Dayton

Dayton 3LU74 1/4 hp HVAC Control

SKU CH-7HYT-CQG9M

A direct-drive blower motor delivers 1/4 hp at 625 rpm with three-speed operation on 208-230 V AC

  • 1/4 hp permanent split capacitor motor runs continuously
  • Three-speed operation matches airflow to demand
  • 208-230 V single-phase supply fits standard wiring
  • Auto thermal protection guards against overheating
  • 48YZ frame with 1/2 in shaft suits direct-drive blowers

Direct-Drive HVAC Blower Motor

The Dayton 3LU74 is a single-phase permanent split capacitor motor rated at 1/4 hp for direct-drive blower applications. It operates on 208-230V AC at 60 Hz and draws 1.75 A at full load. The 48YZ frame unit mounts via studs and can be installed at any angle.

Replaces Worn Single-Speed Units

This three-speed design replaces single-speed or failed PSC motors where variable airflow is now required. The jump is worth it when the original motor ran continuously at one speed and the system needs high, medium and low settings for comfort or efficiency. Auto thermal protection and Class B insulation support continuous duty in the same footprint.

Steady Output at 625 RPM Nameplate

Under sustained load the motor maintains 625 RPM with a 1.0 service factor up to 40 °C ambient. The open air-over enclosure relies on the blower wheel for cooling, so airflow must remain unobstructed. The 1/2 in. diameter shaft extends 6 in. and rotates CW or CCW to match existing rotation.

Highlights

  • 1/4 hp permanent split capacitor motor runs continuously
  • Three-speed operation matches airflow to demand
  • 208-230 V single-phase supply fits standard wiring
  • Auto thermal protection guards against overheating
  • 48YZ frame with 1/2 in shaft suits direct-drive blowers

Specifications

BrandDAYTON

Questions about this item

What shaft diameter and frame size does the 3LU74 motor use for mounting?

The motor has a 1/2 in shaft diameter and fits a 48YZ frame for stud mounting in any angle.

How do you wire the 208-230V single-phase motor for the correct rotation?

Connect the 208-230V AC supply to the permanent split capacitor terminals; the motor runs CW or CCW depending on the wiring configuration.

When should the auto thermal protection be expected to operate on this 1/4 hp blower?

The auto thermal protection trips if the motor exceeds 40 degrees C ambient temperature during continuous duty operation.

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