York S1-VLV-012B-410 TXV Freon allowing for ventilation timing and

allowing for ventilation timing and precise control over indoor air quality

It is factory-calibrated for natural gas applications with a standard 4" W

Simplified Inventory: Serves as the official VG1243AD replacement

Engineered as the direct FSAF24-S replacement

Key Benefits Universal Voltage Compatibility: Operates efficiently across 120V to 277V AC

York S1-VLV-012B-410 TXV Freon allowing for ventilation timing andThe York S1 VLV 012B 410 TXV is a precision engineered OEM thermostatic expansion valve designed specifically for 1 ton residential and light commercial R410A systems. This metering device is critical for maintaining the correct evaporator superheat, preventing liquid slugging to the compressor while ensuring maximum heat transfer efficiency across the coil. Featuring 3 8 x 1 2 inch ODF sweat connections, this valve provides a reliable, leak resistant