Carrier S-4004UA Oil Filter Refrigerant this is a Direct Spark

this is a Direct Spark Ignition (DSI) control designed to spark directly to the main burner

As an inner spring

this SPST pressure switch is factory-calibrated to a -1

This is a critical component for furnace repair and preventative maintenance across various ICP HVAC equipment models

For contractors managing HVAC filtration

Carrier S-4004UA Oil Filter Refrigerant this is a Direct SparkThe Carrier S 4004UA Oil Filter is a critical service component designed for high pressure refrigeration and HVAC systems requiring ultra fine filtration. Rated for a 375 PSIG maximum working pressure, this filter is engineered to maintain lubricant chemistry and protect precision internal compressor parts from abrasive contaminants. With a 4 micron filtration rating, it effectively captures microscopic metallic shavings, carbon deposits, and sludge