Lennox 42W39 5/8″ x 1/2″ ODF 3-Ton Thermostatic Expansion Valve (TXV)

Description

Lennox 42W39 Thermostatic Expansion Valve Overview

The Lennox 42W39 is an OEM thermostatic expansion valve (TXV) engineered for reliable, precise refrigerant metering in 3-ton residential and light commercial cooling systems. Designed as a direct Lennox replacement, this valve maintains optimal system efficiency by regulating refrigerant flow into the evaporator coil in response to real-time superheat conditions — protecting the compressor and maximizing system performance.

Key Features

• OEM Lennox replacement TXV for assured fit and compatibility
• Rated for 3-ton (36,000 BTU/hr) system capacity
• 5/8″ ODF inlet connection for liquid line hookup
• 1/2″ ODF outlet connection for evaporator coil connection
• Thermostatic sensing bulb design for accurate superheat control
• Helps maintain system efficiency and protects compressor from liquid slugging
• Durable construction for long service life in demanding HVAC environments

Application

The 42W39 TXV is intended for use in Lennox split-system air conditioners and heat pumps where a factory-matched expansion valve is required. Always verify system compatibility using the equipment’s service literature or parts manual before installation.

Specifications

• SKU: 42W39
• Brand: Lennox
• Type: Thermostatic Expansion Valve (TXV)
• System Capacity: 3 Ton
• Inlet Connection: 5/8″ ODF
• Outlet Connection: 1/2″ ODF