Weil McLain 383-500-390 Kit

The Weil-McLain 383-500-390 Gas Valve/Venturi Kit is a critical replacement component designed specifically for Liquid Propane (LP) fired Ultra Series high-efficiency condensing boilers. This integrated assembly ensures precise fuel-to-air mixing ratios, which is essential for maintaining optimal combustion stability and fuel economy. The kit includes the Honeywell gas valve, the venturi mixer, and the necessary LP conversion hardware to restore the unit to factory specifications. When troubleshooting ignition failures or CO level fluctuations in Weil-McLain Ultra Gas Boilers, replacing the gas valve/venturi assembly is often necessary to ensure the burner receives the correct manifold pressure. This OEM kit is engineered for drop-in compatibility, mitigating the risks associated with improper air-gas synchronization. Field technicians should verify the inlet and outlet pressure taps during installation to confirm the boiler gas valve replacement meets the required BTU input for the specific model size.

Key Benefits for Contractors

• Precise LP Combustion: Pre-configured for propane applications to ensure immediate flame stability and high-efficiency boiler performance.
• Integrated Venturi Design: Streamlines the replacement process by providing a factory-calibrated fuel-induction system.
• OEM Compatibility: Guaranteed fit for Weil-McLain Ultra Series units, reducing labor time spent on HVAC gas valve troubleshooting.
• Durability: Built to withstand the high-cycle demands of modulating condensing heat exchangers.

Common Questions

Is this gas valve kit compatible with Natural Gas (NG) models?
No, this specific kit is configured for Liquid Propane (LP). Using this assembly on a Natural Gas unit will cause improper combustion and potential safety hazards.

What are the signs that my Weil-McLain venturi assembly needs replacement?
Common indicators include persistent "no ignition" lockout codes, inconsistent flame signals, or the inability to maintain CO2 levels within the manufacturer's specified range during high and low fire testing.

Does the kit include gaskets and mounting hardware?
Yes, the Weil-McLain 383-500-390 includes the hardware necessary to secure the venturi and gas valve assembly to the blower housing.

This item is not eligible for free shipping.

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.