Rheem 51-21854-18 1/5 HP Cond. Fan Motor (208/230V)

The Rheem 51-21854-18 1/5 HP Cond. Fan Motor (208/230V) is a Rheem motor for HVAC repair and replacement work. Use it when the part number 51-21854-18 and the listed specifications match the equipment being serviced.

1/5 HP Cond. Fan Motor Specifications: Run Capacitor (uF/V): 3/370 FLA at 230V (A): 1.25 LRA at 230V (A): 2.5 Shaft Diameter: 1/2″ Motor Body Diameter: 5-5/8″ Keyed/Flat Shaft Length: 3-3/16″ Overall Shaft Length: 3-11/16″ Motor Body Length: 5-9/16″ Overall Motor Length: 7-1/4″ Mounting: Shell-band Frame Size: 48 Bearing Type: Sleeve Application: Condenser Drive Type: Direct Drive

Key Specs

• Voltage: 208V, 230V
• Horse Power: 1/5
• RPM: 1075
• Phase: 1
• Speeds: 1
• Product Type: Motor

Expert Verdict

Reviewed by the SuperArbor Pro Desk: choose this part when the existing component label and unit documentation match 51-21854-18 and the spec set above. It is best suited for targeted HVAC service repairs where exact fitment matters more than broad universal compatibility.

FAQs

What is the Rheem 51-21854-18 used for?

It is a motor for compatible Rheem HVAC equipment. Match the part number 51-21854-18 and the equipment service literature before ordering or installing.

Which specs should I verify before purchase?

Verify the spec set shown for this part: Voltage: 208V, 230V; Horse Power: 1/5; RPM: 1075; Phase: 1; Speeds: 1; Product Type: Motor. The replacement should match the existing component and the unit documentation.

Does the electrical rating need to match exactly?

Yes. Confirm voltage rating 208V, 230V against the failed component label. Do not substitute a different rating unless the equipment manufacturer allows it.

Is this an OEM-style replacement part?

Use it as a direct replacement only when Rheem documentation lists 51-21854-18 or an approved equivalent for the unit being serviced.

Who should install this HVAC component?

A qualified HVAC technician should install and test the motor. Disconnect power first, follow lockout procedures, and confirm safe operation after replacement.

Safety and Installation Notes

Disconnect power before service. HVAC electrical and combustion-related components should be installed and tested by a qualified technician. After installation, confirm wiring, mounting, airflow or fluid routing as applicable, and normal system operation.