Lochinvar L100276822 Low Water Cutoff Manual Reset

Product Description

The LOCHINVAR L100276822 is a manual-reset low water cutoff designed to protect hydronic boilers from operating under low or no-water conditions. When water level drops below the minimum safe threshold, the device interrupts the burner circuit and holds the lockout until a technician manually resets it on-site. This fail-safe behavior makes it well-suited for hot water heating systems where unattended restart after a low-water event is not acceptable. Licensed plumbers, HVAC technicians, and boiler mechanics are the typical installers for this control.

This low water cutoff is intended for use on residential and light-commercial hydronic boilers where manual intervention is required after a low-water safety trip. The manual-reset design ensures that the root cause of the water-level drop is investigated and corrected before the boiler is returned to service, rather than allowing automatic restart that could mask a leak or fill-system fault.

Key Features

• Manual-reset lockout holds burner circuit open until a technician physically resets the device
• Protects boiler heat exchanger from dry-fire damage caused by low or lost system water
• Interrupts burner control circuit on low-water condition for a defined safety hold
• OEM replacement part sourced directly from LOCHINVAR

Compatibility

Designed as an OEM-style replacement low water cutoff for LOCHINVAR hydronic boiler systems. Consult the equipment nameplate and LOCHINVAR service documentation to confirm fitment before installation.

Installation Notes

Installation of a low water cutoff should be performed by a licensed plumber or qualified boiler technician in accordance with applicable local codes and ASME boiler and pressure vessel guidelines. Shut off electrical power to the boiler and close the gas supply before beginning any control replacement. After installation, verify correct wiring connections at the burner control circuit and test the device by initiating a controlled low-water condition per the boiler manufacturer service procedure. Do not bypass or jumper across the low water cutoff terminals during testing or troubleshooting.

Technical Specifications

• Reset Type: Manual
• Function: Low Water Cutoff

Standard Information

• Brand: LOCHINVAR
• Manufacturer Part Number: L100276822