Description
Lennox 42W37 Thermostatic Expansion Valve Overview
The Lennox 42W37 is an OEM thermostatic expansion valve (TXV) engineered for reliable, precise refrigerant metering in 3-ton residential and light commercial HVAC systems. Designed to maintain optimal evaporator superheat under varying load conditions, this TXV helps maximize system efficiency, protect the compressor from liquid slugging, and extend overall equipment life.
Key Features
- OEM Lennox replacement TXV for accurate, drop-in fitment
- 3/8″ ODF inlet (liquid line) connection
- 1/2″ ODF outlet (suction line) connection
- Rated for 3-ton (36,000 BTU/hr) system capacity
- Maintains consistent evaporator superheat for peak system performance
- Helps prevent compressor damage caused by liquid refrigerant slugging
- Designed for compatibility with Lennox split-system air conditioners and heat pumps
Why Use an OEM TXV?
A properly sized and matched thermostatic expansion valve is critical to system efficiency and longevity. The Lennox 42W37 is factory-engineered to work seamlessly with compatible Lennox equipment, ensuring the correct refrigerant flow rate, superheat control, and system balance — reducing callbacks and comebacks in the field.
Application
- Residential and light commercial split-system air conditioners
- Heat pump systems requiring precise refrigerant metering
- Direct OEM replacement for compatible Lennox 3-ton systems
Specifications
- Brand: Lennox
- Part Number / SKU: 42W37
- Valve Type: Thermostatic Expansion Valve (TXV)
- System Capacity: 3 Ton (36,000 BTU/hr)
- Inlet Connection: 3/8″ ODF
- Outlet Connection: 1/2″ ODF
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