Lennox 89M78 Run Capacitor
Professional-grade motor and compressor support starts with a reliable phase shift. The Lennox 89M78 Run Capacitor is a high-performance 45/4 MFD dual run capacitor engineered for precision in residential and light commercial cooling systems. Rated at 370 VAC, this round metal-canister component provides 45 microfarads for the compressor circuit and 4 microfarads for the fan motor, ensuring optimized torque and electrical efficiency during heavy-duty cycles. As a genuine OEM Lennox replacement part, it replaces legacy part numbers 85K43, 100335-10, and 85K4301, maintaining exact terminal alignment for a seamless "drop-in" installation. The round dual run capacitor design is oil-filled for superior heat dissipation, vital for protecting sensitive motor windings in high-ambient environments. HVAC technicians trust the 89M78 for its strict +/- 5% tolerance and 10,000 AFC safety protection rating, making it a critical stock item for repairing XC15, XP15, and HP27 series units.
Key Benefits- Dual-Motor Support: Simultaneously manages the electrical load for both the compressor and the condenser fan motor.
- OEM Compatibility: Precision-fit for Lennox, Armstrong, and Ducane equipment, eliminating the need for mounting bracket modifications.
- Thermal Stability: The round aluminum casing is designed for efficient cooling, extending the operational life of the capacitor.
- Safety Rated: Features an Internal Current Interrupter (10,000 AFC) to protect against internal pressure buildup and potential failure.
- Electrical Precision: Handles 50/60 Hz frequencies with a 370V rating, suitable for standard single-phase HVAC power configurations.
Can I use a 440V capacitor to replace this 370V 89M78 model?
Yes, in HVAC applications, a capacitor with a higher voltage rating (440V) can safely replace a 370V unit as long as the capacitance (45/4 MFD) and physical dimensions match. You cannot, however, use a lower voltage rating than the original spec.
What are the symptoms of a failing 45/4 MFD capacitor?
Common indicators include a humming compressor that fails to start, a fan motor that requires a manual "push" to spin, or a "bubbled" top on the capacitor casing due to internal pressure.
Is the orientation of the terminals important during installation?
Absolutely. Technicians must correctly identify the "C" (Common), "HERM" (Compressor), and "FAN" (Condenser Fan) terminals. Incorrect wiring will result in motor failure or permanent damage to the compressor.
This item is not eligible for free shipping.
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.
Original: $21.91
-65%$21.91
$7.67Lennox 89M78 Run Capacitor
Professional-grade motor and compressor support starts with a reliable phase shift. The Lennox 89M78 Run Capacitor is a high-performance 45/4 MFD dual run capacitor engineered for precision in residential and light commercial cooling systems. Rated at 370 VAC, this round metal-canister component provides 45 microfarads for the compressor circuit and 4 microfarads for the fan motor, ensuring optimized torque and electrical efficiency during heavy-duty cycles. As a genuine OEM Lennox replacement part, it replaces legacy part numbers 85K43, 100335-10, and 85K4301, maintaining exact terminal alignment for a seamless "drop-in" installation. The round dual run capacitor design is oil-filled for superior heat dissipation, vital for protecting sensitive motor windings in high-ambient environments. HVAC technicians trust the 89M78 for its strict +/- 5% tolerance and 10,000 AFC safety protection rating, making it a critical stock item for repairing XC15, XP15, and HP27 series units.
Key Benefits- Dual-Motor Support: Simultaneously manages the electrical load for both the compressor and the condenser fan motor.
- OEM Compatibility: Precision-fit for Lennox, Armstrong, and Ducane equipment, eliminating the need for mounting bracket modifications.
- Thermal Stability: The round aluminum casing is designed for efficient cooling, extending the operational life of the capacitor.
- Safety Rated: Features an Internal Current Interrupter (10,000 AFC) to protect against internal pressure buildup and potential failure.
- Electrical Precision: Handles 50/60 Hz frequencies with a 370V rating, suitable for standard single-phase HVAC power configurations.
Can I use a 440V capacitor to replace this 370V 89M78 model?
Yes, in HVAC applications, a capacitor with a higher voltage rating (440V) can safely replace a 370V unit as long as the capacitance (45/4 MFD) and physical dimensions match. You cannot, however, use a lower voltage rating than the original spec.
What are the symptoms of a failing 45/4 MFD capacitor?
Common indicators include a humming compressor that fails to start, a fan motor that requires a manual "push" to spin, or a "bubbled" top on the capacitor casing due to internal pressure.
Is the orientation of the terminals important during installation?
Absolutely. Technicians must correctly identify the "C" (Common), "HERM" (Compressor), and "FAN" (Condenser Fan) terminals. Incorrect wiring will result in motor failure or permanent damage to the compressor.
This item is not eligible for free shipping.
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.
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Description
Professional-grade motor and compressor support starts with a reliable phase shift. The Lennox 89M78 Run Capacitor is a high-performance 45/4 MFD dual run capacitor engineered for precision in residential and light commercial cooling systems. Rated at 370 VAC, this round metal-canister component provides 45 microfarads for the compressor circuit and 4 microfarads for the fan motor, ensuring optimized torque and electrical efficiency during heavy-duty cycles. As a genuine OEM Lennox replacement part, it replaces legacy part numbers 85K43, 100335-10, and 85K4301, maintaining exact terminal alignment for a seamless "drop-in" installation. The round dual run capacitor design is oil-filled for superior heat dissipation, vital for protecting sensitive motor windings in high-ambient environments. HVAC technicians trust the 89M78 for its strict +/- 5% tolerance and 10,000 AFC safety protection rating, making it a critical stock item for repairing XC15, XP15, and HP27 series units.
Key Benefits- Dual-Motor Support: Simultaneously manages the electrical load for both the compressor and the condenser fan motor.
- OEM Compatibility: Precision-fit for Lennox, Armstrong, and Ducane equipment, eliminating the need for mounting bracket modifications.
- Thermal Stability: The round aluminum casing is designed for efficient cooling, extending the operational life of the capacitor.
- Safety Rated: Features an Internal Current Interrupter (10,000 AFC) to protect against internal pressure buildup and potential failure.
- Electrical Precision: Handles 50/60 Hz frequencies with a 370V rating, suitable for standard single-phase HVAC power configurations.
Can I use a 440V capacitor to replace this 370V 89M78 model?
Yes, in HVAC applications, a capacitor with a higher voltage rating (440V) can safely replace a 370V unit as long as the capacitance (45/4 MFD) and physical dimensions match. You cannot, however, use a lower voltage rating than the original spec.
What are the symptoms of a failing 45/4 MFD capacitor?
Common indicators include a humming compressor that fails to start, a fan motor that requires a manual "push" to spin, or a "bubbled" top on the capacitor casing due to internal pressure.
Is the orientation of the terminals important during installation?
Absolutely. Technicians must correctly identify the "C" (Common), "HERM" (Compressor), and "FAN" (Condenser Fan) terminals. Incorrect wiring will result in motor failure or permanent damage to the compressor.
This item is not eligible for free shipping.
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.
