Lennox 81W20 Run Capacitor
The Lennox 81W20 run capacitor is a heavy-duty 80/10 MFD 440V dual run capacitor engineered specifically for high-demand Lennox, Armstrong, and Ducane HVAC systems. Designed with a round metal case, this component provides the high-torque electrical shift required for 5-ton AC units and heat pumps. With a capacitance rating of 80 microfarads for the compressor (HERM) and 10 microfarads for the condenser fan motor, it ensures stabilized voltage under continuous duty cycles. This OEM Lennox replacement part, also identified by manufacturer number 100335-53, features a 440VAC rating, making it a robust upgrade for systems originally using 370V capacitors. Built to UL 810 safety standards with 10,000 AFC protection, it utilizes non-PCB, oil-filled technology to dissipate heat during peak summer loads. For technicians, the standard 2.5-inch diameter ensures compatibility with existing mounting brackets in 13ACX and 13HPX series units, preventing field modifications and reducing downtime during emergency service calls.
Key Technical Benefits:- Dual-Purpose Performance: Simultaneously manages the 80 MFD compressor circuit and 10 MFD fan circuit to maintain precise motor timing.
- High-Voltage Durability: Rated for 440VAC to safely handle voltage fluctuations that often cause 370V rated components to fail.
- OEM Precision: Guaranteed +/- 5% tolerance for exact adherence to Lennox motor nameplate specifications.
- Industrial-Grade Build: Features a flame-retardant aluminum housing and quick-connect spade terminals for secure, high-vibration resistance.
- Wide Cross-Compatibility: Replaces multiple obsolete Lennox part numbers including 21W81, 38M42, 95M02, and 48J22.
Can I use an 80/10 440V capacitor to replace a 370V version?
Yes. You can always move up in voltage (e.g., replacing 370V with 440V), but you must never move down. The 81W20 provides superior dielectric strength and longer life in high-heat environments.
How do I verify a failing 80/10 MFD capacitor in the field?
Check for a bulged top or oil leakage. If using a multimeter with MFD settings, ensure readings are within 5% of the 80 and 10 microfarad ratings. A reading below 76 MFD on the HERM terminal indicates it is time for a replacement.
What is the physical size of the 81W20 Lennox capacitor?
This is a round 2.5-inch diameter can with an approximate height of 6 inches (6-1/4 inches including terminals). Always verify the cabinet clearance in older "slim-line" units before installation.
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.
Lennox 81W20 Run Capacitor
The Lennox 81W20 run capacitor is a heavy-duty 80/10 MFD 440V dual run capacitor engineered specifically for high-demand Lennox, Armstrong, and Ducane HVAC systems. Designed with a round metal case, this component provides the high-torque electrical shift required for 5-ton AC units and heat pumps. With a capacitance rating of 80 microfarads for the compressor (HERM) and 10 microfarads for the condenser fan motor, it ensures stabilized voltage under continuous duty cycles. This OEM Lennox replacement part, also identified by manufacturer number 100335-53, features a 440VAC rating, making it a robust upgrade for systems originally using 370V capacitors. Built to UL 810 safety standards with 10,000 AFC protection, it utilizes non-PCB, oil-filled technology to dissipate heat during peak summer loads. For technicians, the standard 2.5-inch diameter ensures compatibility with existing mounting brackets in 13ACX and 13HPX series units, preventing field modifications and reducing downtime during emergency service calls.
Key Technical Benefits:- Dual-Purpose Performance: Simultaneously manages the 80 MFD compressor circuit and 10 MFD fan circuit to maintain precise motor timing.
- High-Voltage Durability: Rated for 440VAC to safely handle voltage fluctuations that often cause 370V rated components to fail.
- OEM Precision: Guaranteed +/- 5% tolerance for exact adherence to Lennox motor nameplate specifications.
- Industrial-Grade Build: Features a flame-retardant aluminum housing and quick-connect spade terminals for secure, high-vibration resistance.
- Wide Cross-Compatibility: Replaces multiple obsolete Lennox part numbers including 21W81, 38M42, 95M02, and 48J22.
Can I use an 80/10 440V capacitor to replace a 370V version?
Yes. You can always move up in voltage (e.g., replacing 370V with 440V), but you must never move down. The 81W20 provides superior dielectric strength and longer life in high-heat environments.
How do I verify a failing 80/10 MFD capacitor in the field?
Check for a bulged top or oil leakage. If using a multimeter with MFD settings, ensure readings are within 5% of the 80 and 10 microfarad ratings. A reading below 76 MFD on the HERM terminal indicates it is time for a replacement.
What is the physical size of the 81W20 Lennox capacitor?
This is a round 2.5-inch diameter can with an approximate height of 6 inches (6-1/4 inches including terminals). Always verify the cabinet clearance in older "slim-line" units before installation.
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
The Lennox 81W20 run capacitor is a heavy-duty 80/10 MFD 440V dual run capacitor engineered specifically for high-demand Lennox, Armstrong, and Ducane HVAC systems. Designed with a round metal case, this component provides the high-torque electrical shift required for 5-ton AC units and heat pumps. With a capacitance rating of 80 microfarads for the compressor (HERM) and 10 microfarads for the condenser fan motor, it ensures stabilized voltage under continuous duty cycles. This OEM Lennox replacement part, also identified by manufacturer number 100335-53, features a 440VAC rating, making it a robust upgrade for systems originally using 370V capacitors. Built to UL 810 safety standards with 10,000 AFC protection, it utilizes non-PCB, oil-filled technology to dissipate heat during peak summer loads. For technicians, the standard 2.5-inch diameter ensures compatibility with existing mounting brackets in 13ACX and 13HPX series units, preventing field modifications and reducing downtime during emergency service calls.
Key Technical Benefits:- Dual-Purpose Performance: Simultaneously manages the 80 MFD compressor circuit and 10 MFD fan circuit to maintain precise motor timing.
- High-Voltage Durability: Rated for 440VAC to safely handle voltage fluctuations that often cause 370V rated components to fail.
- OEM Precision: Guaranteed +/- 5% tolerance for exact adherence to Lennox motor nameplate specifications.
- Industrial-Grade Build: Features a flame-retardant aluminum housing and quick-connect spade terminals for secure, high-vibration resistance.
- Wide Cross-Compatibility: Replaces multiple obsolete Lennox part numbers including 21W81, 38M42, 95M02, and 48J22.
Can I use an 80/10 440V capacitor to replace a 370V version?
Yes. You can always move up in voltage (e.g., replacing 370V with 440V), but you must never move down. The 81W20 provides superior dielectric strength and longer life in high-heat environments.
How do I verify a failing 80/10 MFD capacitor in the field?
Check for a bulged top or oil leakage. If using a multimeter with MFD settings, ensure readings are within 5% of the 80 and 10 microfarad ratings. A reading below 76 MFD on the HERM terminal indicates it is time for a replacement.
What is the physical size of the 81W20 Lennox capacitor?
This is a round 2.5-inch diameter can with an approximate height of 6 inches (6-1/4 inches including terminals). Always verify the cabinet clearance in older "slim-line" units before installation.
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.
