Emerson Alco 065874 Expansion Valve

The Emerson Alco 065874 Expansion Valve (Model AACE 4 ZW195 5FT 3/8 X 1/2 ODF S/T) is a high-performance thermal expansion valve engineered for R410A air conditioning and refrigeration systems. With a 4-ton capacity and low-temperature MOP 195 PSI charge, this externally equalized TXV ensures precise refrigerant metering and prevents compressor floodback during low-load conditions. The straight body design features 3/8" x 1/2" sweat ODF connections and an integrated internal check valve, making it ideal for heat pump applications or systems requiring bi-directional flow. The 5-foot capillary tube provides sufficient length for flexible sensing bulb placement on the suction line. This Alco AACE series expansion valve utilizes a stainless steel power element to resist corrosion and ensure long-term reliability in demanding HVACR environments. Its balanced port construction compensates for changing head pressures, maintaining stable superheat across a wide operating range for maximum system efficiency.

• R410A Compatibility: Specifically calibrated for high-pressure R410A systems with a 4-ton nominal capacity.
• MOP 195 PSI Charge: Maximum Operating Pressure protection prevents motor overload during high-load startups.
• Stainless Steel Power Element: Enhanced durability and resistance to stress-related failures in the field.
• Internal Check Valve: Eliminates the need for external piping in reverse-cycle heat pump configurations.
• Precise Superheat Control: Externally equalized design ensures accurate evaporator performance by compensating for pressure drops.

Common Technical Questions

What is the primary application for the AACE 4 ZW195?
This valve is designed for R410A systems requiring a 4-ton capacity, specifically where low-temperature MOP protection is needed to safeguard the compressor from excessive suction pressure.

Can this TXV be used in heat pump systems?
Yes, the internal check valve allows for bi-directional flow, making it a direct fit for heat pump applications without requiring an external bypass loop.

How do I ensure proper bulb placement?
The sensing bulb should be mounted on a horizontal section of the suction line at the 4 or 8 o’clock position, ensuring the 5' capillary tube is protected from vibration and sharp bends.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.