Lennox 21J29 Start Capacitor
The Lennox 21J29 Start Capacitor is a heavy-duty 270-324 MFD 330V round electrolytic component engineered to provide the high-torque boost required during the initial compressor startup phase. This genuine OEM Lennox part, which is functionally identical to the 21J2901, is critical for single-phase HVAC systems that utilize a non-bleed TXV or encounter high static pressure. By delivering a precise voltage surge to the start winding, this capacitor reduces the duration of inrush current, protecting motor windings from excessive thermal stress and premature burnout.
Encased in a rugged black phenolic housing, this 330VAC start capacitor is built to withstand rapid cycling in demanding commercial and residential environments. It is compatible with a broad range of Lennox, Allied, and Armstrong units, including popular series like the 14ACX, 10ACC, and LGA060. For optimal system reliability, it is recommended to inspect the potential relay when replacing the Lennox 21J29, as a sticking relay is a primary cause of capacitor overheating. This unit features standard quick-connect terminals for seamless integration into existing 50/60Hz electrical circuits.
Key Benefits- High Starting Torque: Provides the necessary phase shift to achieve 300% to 500% more torque, ensuring the compressor overcomes pressure imbalances.
- OEM Compatibility: Exact replacement for Lennox 21J2901 and various Allied Air brand part numbers.
- Enhanced Component Life: Minimizes "hard starts" and humming, reducing mechanical wear on the compressor's internal assemblies.
- Industrial-Grade Construction: Designed for stable performance across a wide operating temperature range (-40°C to 65°C).
- Can I use the 21J2901 instead of the 21J29? Yes, these two part numbers are identical in technical specifications and fitment.
- How do I know if my start capacitor is failing? Look for a bulging top membrane, humming noises from the condenser, or a compressor that clicks but fails to turn over.
- Does this replace a run capacitor? No, this is a dedicated start capacitor designed to stay in the circuit for only a fraction of a second until the motor reaches roughly 75% speed.
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: $55.93
-65%$55.93
$19.58Lennox 21J29 Start Capacitor
The Lennox 21J29 Start Capacitor is a heavy-duty 270-324 MFD 330V round electrolytic component engineered to provide the high-torque boost required during the initial compressor startup phase. This genuine OEM Lennox part, which is functionally identical to the 21J2901, is critical for single-phase HVAC systems that utilize a non-bleed TXV or encounter high static pressure. By delivering a precise voltage surge to the start winding, this capacitor reduces the duration of inrush current, protecting motor windings from excessive thermal stress and premature burnout.
Encased in a rugged black phenolic housing, this 330VAC start capacitor is built to withstand rapid cycling in demanding commercial and residential environments. It is compatible with a broad range of Lennox, Allied, and Armstrong units, including popular series like the 14ACX, 10ACC, and LGA060. For optimal system reliability, it is recommended to inspect the potential relay when replacing the Lennox 21J29, as a sticking relay is a primary cause of capacitor overheating. This unit features standard quick-connect terminals for seamless integration into existing 50/60Hz electrical circuits.
Key Benefits- High Starting Torque: Provides the necessary phase shift to achieve 300% to 500% more torque, ensuring the compressor overcomes pressure imbalances.
- OEM Compatibility: Exact replacement for Lennox 21J2901 and various Allied Air brand part numbers.
- Enhanced Component Life: Minimizes "hard starts" and humming, reducing mechanical wear on the compressor's internal assemblies.
- Industrial-Grade Construction: Designed for stable performance across a wide operating temperature range (-40°C to 65°C).
- Can I use the 21J2901 instead of the 21J29? Yes, these two part numbers are identical in technical specifications and fitment.
- How do I know if my start capacitor is failing? Look for a bulging top membrane, humming noises from the condenser, or a compressor that clicks but fails to turn over.
- Does this replace a run capacitor? No, this is a dedicated start capacitor designed to stay in the circuit for only a fraction of a second until the motor reaches roughly 75% speed.
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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Lennox 21J29 Start Capacitor is a heavy-duty 270-324 MFD 330V round electrolytic component engineered to provide the high-torque boost required during the initial compressor startup phase. This genuine OEM Lennox part, which is functionally identical to the 21J2901, is critical for single-phase HVAC systems that utilize a non-bleed TXV or encounter high static pressure. By delivering a precise voltage surge to the start winding, this capacitor reduces the duration of inrush current, protecting motor windings from excessive thermal stress and premature burnout.
Encased in a rugged black phenolic housing, this 330VAC start capacitor is built to withstand rapid cycling in demanding commercial and residential environments. It is compatible with a broad range of Lennox, Allied, and Armstrong units, including popular series like the 14ACX, 10ACC, and LGA060. For optimal system reliability, it is recommended to inspect the potential relay when replacing the Lennox 21J29, as a sticking relay is a primary cause of capacitor overheating. This unit features standard quick-connect terminals for seamless integration into existing 50/60Hz electrical circuits.
Key Benefits- High Starting Torque: Provides the necessary phase shift to achieve 300% to 500% more torque, ensuring the compressor overcomes pressure imbalances.
- OEM Compatibility: Exact replacement for Lennox 21J2901 and various Allied Air brand part numbers.
- Enhanced Component Life: Minimizes "hard starts" and humming, reducing mechanical wear on the compressor's internal assemblies.
- Industrial-Grade Construction: Designed for stable performance across a wide operating temperature range (-40°C to 65°C).
- Can I use the 21J2901 instead of the 21J29? Yes, these two part numbers are identical in technical specifications and fitment.
- How do I know if my start capacitor is failing? Look for a bulging top membrane, humming noises from the condenser, or a compressor that clicks but fails to turn over.
- Does this replace a run capacitor? No, this is a dedicated start capacitor designed to stay in the circuit for only a fraction of a second until the motor reaches roughly 75% speed.
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.
