Weil Mclain 511624405 Pressure Switch 0.75 Inch Wc

Product Description

The WEIL MCLAIN 511624405 is a pressure switch set at 0.75 inches water column (WC), designed for use in gas-fired heating appliances. Pressure switches are safety devices that monitor combustion air pressure during the burner cycle. This switch confirms that the inducer motor is producing adequate draft before allowing the ignition sequence to proceed. When pressure falls outside the setpoint, the switch opens the control circuit and locks out the burner, protecting against unsafe flue or combustion conditions. Licensed HVAC technicians install and service this component as part of routine furnace or boiler maintenance and fault diagnostics.

This pressure switch is appropriate for residential or light commercial gas-fired heating equipment where a 0.75 inch WC setpoint is specified. It is typically found in induced-draft or forced-draft furnace and boiler applications. When diagnosing a no-heat call or a pressure switch fault code, technicians verify inducer operation, check hose connections for cracks or blockages, and confirm the switch opens and closes at the correct setpoint before condemning the part.

Key Features

• Factory-set at 0.75 inches water column (WC) — no field adjustment required
• Functions as a safety interlock in the burner control sequence
• Designed for induced-draft and forced-draft gas heating applications
• OEM replacement part sourced directly from WEIL MCLAIN

Compatibility

Designed as an OEM replacement pressure switch for WEIL MCLAIN gas-fired furnace and boiler equipment requiring a 0.75 inch WC setpoint. Consult equipment documentation or the nameplate to confirm this setpoint matches the original switch before installation.

Installation Notes

Installation should be performed by a licensed HVAC technician familiar with gas appliance controls and local mechanical codes. Shut off power to the unit and allow the system to cool before removing the existing switch. Inspect pressure tap hoses for cracks, blockages, or improper routing before installing the replacement. Verify the new switch operates correctly through a full ignition cycle before returning the unit to service.

Technical Specifications

• Pressure Setpoint: 0.75 inches water column (WC)
• UPC: 672619167957

Standard Information

• Brand: WEIL MCLAIN
• Manufacturer Part Number: 511624405