Lennox 12J41 3/8″ ODM x 1/2″ ODF 3-Ton 5% Bleed TXV

Description

Lennox 12J41 Thermostatic Expansion Valve Overview

The Lennox 12J41 is a factory-engineered thermostatic expansion valve (TXV) designed to deliver precise refrigerant metering and optimal system efficiency in 3-ton HVAC applications. With a 3/8″ ODM inlet and 1/2″ ODF outlet, this valve is built for straightforward installation and a secure, leak-free connection in split-system air conditioners and heat pumps.

Key Features

• 3-ton rated capacity for accurate refrigerant flow control in residential and light commercial systems
• 3/8″ ODM (male) inlet connection for compatibility with standard liquid line configurations
• 1/2″ ODF (female) outlet connection for direct coil or evaporator hookup
• 5% internal bleed port ensures pressure equalization during off-cycles, enabling reliable compressor restart
• Genuine Lennox OEM replacement part — engineered to original equipment specifications
• Maintains consistent superheat settings for improved system efficiency and compressor protection

Technical Specifications

• SKU: 12J41
• Brand: Lennox
• Valve Type: Thermostatic Expansion Valve (TXV)
• Inlet Connection: 3/8″ ODM
• Outlet Connection: 1/2″ ODF
• System Capacity: 3 Ton
• Bleed: 5% Internal Bleed

Application

The Lennox 12J41 TXV is the ideal OEM replacement for Lennox split-system air conditioning and heat pump units requiring a 3-ton thermostatic expansion valve. The 5% internal bleed design allows refrigerant to slowly equalize pressure across the valve during the off-cycle, reducing compressor start load and extending equipment life. Proper TXV function is critical to maintaining correct superheat, preventing liquid slugging, and ensuring peak seasonal efficiency.