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The terminal designations (1
Engineered to handle a wide range of refrigerants
ensuring durability in harsh environments like cooling towers
Durable Construction: Built to endure the thermal stresses and corrosive byproducts of solid fuel combustion
Standard industry practice dictates replacing the internal oil filter during any major HVAC system diagnostic or when oil analysis indicates high acid or metal counts
Lochinvar & A.O. Smith 100227399 Pressure Switch 320720-756 The terminal designations (1The Lochinvar & A. O. Smith 100227399 Pressure Switch is a critical safety component engineered for precise combustion air pressure sensing in high efficiency boilers and water heaters. As a normally closed (N. C.) pressure switch factory set to 2. 12" WC (Water Column), this OEM replacement part ensures the inducer motor is moving sufficient air for safe ignition and sustained burner operation. When troubleshooting a pressure switch stuck closed or