Lennox 29M11 TXV
The Lennox 29M11 is a high-performance thermostatic expansion valve (TXV) engineered for residential and light commercial air conditioning applications. Designed for 4-ton systems, this genuine OEM Lennox part ensures precise refrigerant metering to maintain target evaporator superheat across varying thermal loads. The 29M11 expansion valve features a 3/8" x 5/8" ODF (Solder) connection for secure, leak-resistant installation and includes a 30-inch capillary tube for flexible sensing bulb placement on the suction line. As a critical component in ensuring system efficiency, this refrigerant flow control device prevents liquid slugging and optimizes the heat exchange rate within the evaporator coil. Whether you are performing a Lennox 29M11 replacement or a new system commissioning, this valve provides the reliability required by veteran HVAC technicians to keep units running at peak AHRI-rated capacity.
Key Benefits- Precise Superheat Control: Automatically adjusts refrigerant flow to prevent compressor damage and maintain cooling efficiency.
- 4-Ton Capacity: Specifically factory-calibrated for 48,000 BTU systems to match original equipment design specifications.
- Robust ODF Connections: Features 3/8 inch inlet and 5/8 inch outlet braze ports for a permanent, high-pressure seal.
- Extended Capillary Reach: The 30" sensing lead allows for professional routing and secure insulation of the thermal bulb.
- OEM Compatibility: Replaces common legacy valves in Lennox CB17 series and other compatible air handlers for a drop-in fit.
What refrigerant is the Lennox 29M11 compatible with?
While often utilized in R-410A systems, always check the specific power head marking or your system’s service manual to confirm the designated refrigerant type before brazing.
Can I use this TXV on a 3.5-ton indoor coil?
It is recommended to match the TXV tonnage exactly to the outdoor unit and indoor coil capacity. Using a 4-ton 29M11 on an undersized system can lead to hunting and unstable superheat levels.
Does this valve include the internal check valve?
Yes, as a standard check-expansion valve, it allows for reverse flow during heating cycles in heat pump applications, though it is primarily optimized for the cooling circuit.
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: $124.58
-65%$124.58
$43.60Product Information
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Description
The Lennox 29M11 is a high-performance thermostatic expansion valve (TXV) engineered for residential and light commercial air conditioning applications. Designed for 4-ton systems, this genuine OEM Lennox part ensures precise refrigerant metering to maintain target evaporator superheat across varying thermal loads. The 29M11 expansion valve features a 3/8" x 5/8" ODF (Solder) connection for secure, leak-resistant installation and includes a 30-inch capillary tube for flexible sensing bulb placement on the suction line. As a critical component in ensuring system efficiency, this refrigerant flow control device prevents liquid slugging and optimizes the heat exchange rate within the evaporator coil. Whether you are performing a Lennox 29M11 replacement or a new system commissioning, this valve provides the reliability required by veteran HVAC technicians to keep units running at peak AHRI-rated capacity.
Key Benefits- Precise Superheat Control: Automatically adjusts refrigerant flow to prevent compressor damage and maintain cooling efficiency.
- 4-Ton Capacity: Specifically factory-calibrated for 48,000 BTU systems to match original equipment design specifications.
- Robust ODF Connections: Features 3/8 inch inlet and 5/8 inch outlet braze ports for a permanent, high-pressure seal.
- Extended Capillary Reach: The 30" sensing lead allows for professional routing and secure insulation of the thermal bulb.
- OEM Compatibility: Replaces common legacy valves in Lennox CB17 series and other compatible air handlers for a drop-in fit.
What refrigerant is the Lennox 29M11 compatible with?
While often utilized in R-410A systems, always check the specific power head marking or your system’s service manual to confirm the designated refrigerant type before brazing.
Can I use this TXV on a 3.5-ton indoor coil?
It is recommended to match the TXV tonnage exactly to the outdoor unit and indoor coil capacity. Using a 4-ton 29M11 on an undersized system can lead to hunting and unstable superheat levels.
Does this valve include the internal check valve?
Yes, as a standard check-expansion valve, it allows for reverse flow during heating cycles in heat pump applications, though it is primarily optimized for the cooling circuit.
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.
