Lochinvar & A.O. Smith 100073333 Kit

The Lochinvar & A.O. Smith 100073333 Kit is a specialized FTX HI/LOW PRESSURE SWITCH KIT engineered for precise gas pressure monitoring in FTX600-850 heating systems. This OEM-certified kit includes both high gas pressure switch and low gas pressure switch components, providing a critical failsafe to protect the boiler heat exchanger and combustion assembly from erratic supply pressures. Featuring a manual reset mechanism, the 100073333 ensures that if a pressure threshold is breached, the system remains in a safe lockout state until a technician can verify the gas manifold pressure and overall system integrity. Designed for high-efficiency commercial boilers, this kit maintains the safety-limit string, preventing equipment damage caused by low-pressure flame instability or high-pressure over-firing. Its 0.68lb compact build allows for seamless integration into existing control manifolds, ensuring long-term HVAC system reliability and compliance with rigorous safety standards for Lochinvar FTX units.

Key Benefits:

• Dual-point protection monitors both high and low gas pressure thresholds simultaneously.
• Manual reset functionality prevents automatic restarts after a safety Trip for enhanced site security.
• Genuine Lochinvar OEM part ensures exact calibration and direct fit for FTX600-850 models.
• Robust construction withstands the high-cycling demands of commercial boiler applications.
• Critical for maintaining the burner's combustion stability and preventing component fatigue.

Common Questions:

Which boiler models are compatible with this kit?
The 100073333 is specifically designed for the Lochinvar FTX600 through FTX850 series boilers. For FTX500 models, specific alternates like the 100073334 may be required.

Does this switch require professional calibration?
While factory-calibrated, these switches must be installed and verified by a licensed technician using a manometer to confirm they align with the specific manifold pressure requirements of your installation.

What causes these switches to trip frequently?
Frequent trips are often indicative of gas supply fluctuations, a failing external regulator, or debris in the gas line. If the manual reset will not hold, it is essential to check the upstream gas pressure during high-demand cycles.

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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.