York S1-1TVMBB1 Expansion Valve

Maintain precise superheat control in R410A systems with the York S1-1TVMBB1 expansion valve. This 2-ton thermostatic expansion valve (TXV) is engineered specifically for York, Luxaire, and Coleman air handlers and indoor coils, featuring the necessary 3/4 inch Chatleff connector for a secure, leak-free mechanical fit. Designed for both cooling-only and heat pump applications, this direct OEM replacement includes an internal check valve to handle reverse flow requirements seamlessly. The 30BLD flowrater assembly ensures the 30,000 BTU/hr capacity is managed with surgical precision, preventing liquid slugging and protecting the compressor from saturation during low-load conditions. As any seasoned tech knows, moving from a fixed orifice to an adjustable TXV like the S1-1TVMBB1 is the best way to stabilize suction pressures and optimize the SEER rating of the split system. This kit comes with the sensing bulb, bulb clamps, and high-density thermal insulation to ensure ambient air doesn't skew your superheat readings.

• Optimized Refrigerant Metering: Specifically calibrated for 2-ton R410A evaporator coils to keep superheat at the target 8-12°F range.
• Chatleff Connection Design: Features a 3/4" Chatleff nut that simplifies installation on compatible York indoor units without the need for additional brazing at the distributor.
• Internal Check Valve: Engineered for split-system heat pumps, allowing unrestricted flow in heating mode while providing precise metering in cooling mode.
• System Efficiency: Replaces standard flowrater pistons to provide dynamic response to load changes, improving humidity removal and energy performance.

Is this TXV compatible with older R-22 systems?
No, the York S1-1TVMBB1 is strictly for R410A refrigerant. The spring pressure and power element are factory-set for the high-pressure characteristics of 410A; using it with R-22 will result in improper metering.

Do I need a hard start kit when installing this valve?
In most residential split-system applications where the compressor uses a permanent split capacitor (PSC) motor, a hard start kit is recommended to help the compressor overcome the pressure differential across the S1-1TVMBB1 during startup.

Where should the sensing bulb be positioned?
For 7/8" suction lines, the sensing bulb should be mounted at the 10 o'clock or 2 o'clock position on a horizontal run. Always ensure the bulb is insulated with the provided wrap to prevent the thermal expansion valve from hunting due to ambient temperature influence.

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.