Unico txv-3t-454 Txv Kit 3 Ton R454B Chatleff

Product Description

The UNICO txv-3t-454 is a thermostatic expansion valve kit designed for use with R454B refrigerant systems rated at 3 tons. The kit includes Chatleff connections, which are the standard fitting type required for A2L-compatible refrigerant circuits. Licensed HVAC technicians install this valve as part of the metering device assembly in a split or air handler system. The TXV regulates refrigerant flow into the evaporator coil, maintaining proper superheat and protecting the compressor from liquid flood-back. This kit format simplifies field installation by supplying the valve and connection hardware together.

This valve kit is intended for residential and light-commercial cooling systems operating on R454B, a lower-GWP A2L refrigerant now common in newer equipment. It is sized for 3-ton capacity systems and is suited for use with Unico high-velocity air handler systems or compatible equipment that calls for Chatleff-style TXV connections. Install scenarios typically include new equipment commissioning or refrigerant-circuit component replacement during a system upgrade from legacy refrigerants.

Key Features

• Rated for 3-ton system capacity
• Configured for R454B refrigerant, an A2L lower-GWP replacement refrigerant
• Chatleff connections included for A2L-compatible circuit fittings
• Kit format supplies valve and connection hardware together for field installation
• Functions as the metering device to regulate refrigerant flow and maintain proper superheat

Compatibility

Designed for use with 3-ton R454B refrigerant systems requiring Chatleff-style TXV connections, consistent with Unico high-velocity system applications.

Installation Notes

Installation must be performed by an EPA Section 608-certified HVAC technician familiar with A2L refrigerant handling requirements. Recover all refrigerant and de-energize the system before removing the existing metering device. Follow equipment manufacturer torque and brazing specifications for Chatleff fittings, and verify superheat after recharge to confirm proper valve operation. Consult local codes and ASHRAE 15 guidelines for A2L refrigerant safety requirements in the installation space.

Technical Specifications

• Refrigerant Type: R454B
• System Capacity: 3 tons
• Connection Type: Chatleff
• Valve Type: Thermostatic Expansion Valve (TXV)

Standard Information

• Brand: UNICO
• Manufacturer Part Number: txv-3t-454