this 24VAC gas valve features a 1-1/4" NPT connection

For ammonia applications

If the furnace requires more than two stages of sequenced delay

Diagnostic LED: Provides immediate visual feedback on system status

It is functionally identical to the 140S-3-3/4-150 and LF140S3-150-3/4 models

York S1-025-37421-460 Crankcase Heater 321702-401 this 24VAC gas valve featuresThe York S1 025 37421 460 is a high specification belt type crankcase heater engineered for heavy duty industrial and commercial HVAC applications. Operating at 480 Volts with a 70 Watts power rating, this component is essential for maintaining optimal compressor oil temperature. By keeping the lubricant warmer than the coldest part of the system, it effectively prevents refrigerant migration and subsequent liquid slugging during low ambient startups.