The Emerson Alco 059603 (Model AAEB 3 HCA) is a high-performance thermal expansion valve designed specifically for air conditioning and heat pump applications. Engineered for R22 and R407C refrigerants, this 3-ton TXV features a straight-through body with 3/8 x 1/2 ODF sweat connections. The externally equalized design ensures accurate superheat control across varying evaporator loads, while the HCA heat pump charge provides stable bulb control during low ambient conditions. This unit is built with a 30-inch capillary tube for flexible bulb placement and includes an integrated bleed hole to facilitate pressure equalization during the off-cycle, making it compatible with permanent split capacitor (PSC) compressors. Reliable superheat regulation is critical for preventing liquid slugging and maintaining system efficiency in residential HVAC systems. For contractors performing retrofits or repairs, the AAEB series offers a stainless steel power element that resists corrosion and extends the service life of the refrigerant metering device. Precise Superheat Control: The externally equalized port compensates for pressure drops in the evaporator, ensuring maximum coil efficiency. Application Versatility: Direct replacement for R22/R407C 3-ton systems, utilizing a heat pump charge to minimize hunt and maintain stability. Durable Construction: Features a hermetic design with a stainless steel power assembly to protect against harsh environments and vibration. Off-Cycle Equalization: Equipped with a bleed hole to balance high and low side pressures, reducing motor torque requirements at startup. Commonly Asked Questions Can I use the AAEB 3 HCA on an R410A system? No, this TXV is specifically calibrated for the pressure-temperature curves of R22 and R407C. Using it with R410A will lead to improper refrigerant flow and potential compressor damage. What is the purpose of the 15% bleed hole in this valve? The bleed hole allows a small amount of refrigerant to bypass the seat during the off-cycle. This equalizes the system pressure, allowing compressors with low starting torque to restart without stalling. What is the advantage of the HCA charge in heat pump applications? The HCA charge is a liquid-charged power element designed to prevent "charge migration" to the head of the valve, ensuring the bulb retains control even if the valve body becomes colder than the bulb. 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.
