Westinghouse 669566R Txv R-410A 3 Ton Air Handler

Product Description

The WESTINGHOUSE 669566R is a thermal expansion valve (TXV) designed for use with R-410A refrigerant in residential variable speed indoor air handler systems. Rated at 3 tons of cooling capacity, this TXV meters refrigerant flow into the evaporator coil, maintaining the correct superheat level across the operating range of the system. It is a direct OEM-style replacement component installed by licensed HVAC technicians during system servicing, coil replacement, or refrigerant circuit repair on compatible WESTINGHOUSE air handler equipment.

This TXV is specified for use with the WESTINGHOUSE PAH4VM-X36K-B variable speed indoor air handler, part of the PAH4VM model family. Variable speed air handlers require precisely matched expansion devices to support proper system efficiency and capacity at varying compressor and blower speeds. Installing the correct 3-ton R-410A TXV ensures the refrigerant circuit operates within design parameters across all system stages.

Key Features

• Rated for 3-ton cooling capacity with R-410A refrigerant
• Designed specifically for variable speed indoor air handler applications
• OEM-specified replacement part for the PAH4VM-X36K-B air handler
• Controls refrigerant superheat for efficient evaporator coil operation
• Direct fitment eliminates field modification during installation

Compatibility

Specified for the WESTINGHOUSE PAH4VM-X36K-B variable speed indoor air handler (model family: PAH4VM).

Installation Notes

TXV replacement is performed by EPA Section 608 certified HVAC technicians. Recover all refrigerant from the system before opening the refrigerant circuit. Follow all applicable mechanical and refrigeration codes, including local jurisdiction requirements, when brazing or connecting refrigerant lines. After installation, leak-check all connections and perform a proper system evacuation before recharging with R-410A refrigerant.

Technical Specifications

• Part Type: Thermal Expansion Valve (TXV)
• Refrigerant: R-410A
• Capacity: 3 Ton
• Application: Variable Speed Indoor Air Handler
• Compatible Unit Part Number: PAH4VM-X36K-B
• Compatible Model Family: PAH4VM

Standard Information

• Brand: WESTINGHOUSE
• Manufacturer Part Number: 669566R