Lennox 70M29 Expansion Valve

The Lennox 70M29 Expansion Valve is a critical OEM replacement part engineered for precise refrigerant metering in residential and commercial cooling systems. This thermostatic expansion valve (TXV) is designed to regulate flow based on evaporator load, ensuring maximum heat exchange efficiency and preventing liquid slugging in the compressor. The 70M29 is technically identical to 70M2901 and serves as a direct replacement for legacy part numbers 17W13 and 20408001. Built by Parker (HCE series) for Lennox, it features a 1.5 to 3.0-ton capacity and is primarily utilized in R-22 and R-407C applications. With a 30-inch capillary tube and an external equalizer, this valve maintains stable superheat across varying ambient conditions. For HVAC contractors, this 70M29 Lennox part ensures a reliable fit in A-coil and heat pump configurations, bringing system performance back to original manufacturer specifications without the need for field modifications.

• Precise Refrigerant Control: Optimizes 1.5-3.0 ton system efficiency by maintaining exact superheat levels.
• Universal OEM Compatibility: Directly replaces 70M2901, 17W13, and R20408001 across various Lennox, Armstrong, and Ducane units.
• Enhanced System Reliability: Features durable construction and a 30" capillary to withstand high-vibration environment requirements.
• Optimized Heat Exchange: Prevents evaporator freezing and overfeeding to protect the compressor from damage during operation.

Is the Lennox 70M29 compatible with R-410A systems?
No, this specific model is engineered for R-22 and R-407C refrigerants. Check your system nameplate to confirm the refrigerant type before installation.

What is the difference between 70M29 and 70M2901?
There is no functional difference; 70M29 is identical to 70M2901. They are the same OEM component used interchangeably in manufacturer catalogs.

Does this kit include mounting hardware?
Standard kits typically include the thermal expansion valve, bulb mounting brackets, and necessary screws or nuts for securing the sensing bulb to the suction line.

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.