Weil Mclain 510-312-015 Aquastat

The Weil-McLain 510-312-015 Aquastat with Well is a critical high-limit temperature control designed specifically for hydronic heating systems. Engineered for Weil-McLain HE, HE II, and VHE boiler models, this SPST (Single Pole Single Throw) control acts as a safety limit by sensing boiler water temperature directly via the included immersion well. The 510-312-015 features an adjustable temperature range of 100°F to 240°F and a 5°F to 30°F adjustable differential, allowing for precise calibration based on specific system demands and load profiles. This model employs an automatic recycle function, ensuring the burner circuit re-energizes once water temperatures fall within the safe differential setpoint. For technicians performing boiler maintenance or Aquastat replacement, this OEM Weil-McLain part ensures full compatibility with the combustion control circuit, maintaining the integrity of the High Limit Temperature Control circuit and preventing lockout issues or erratic system cycling under heavy demand.

Key Benefits

• Compatible with Weil-McLain HE, HE II, and VHE series boilers for exact fitment and reliable operation.
• Features an adjustable differential range (5°F to 30°F) to optimize burner run times and prevent short-cycling.
• Includes a sensing well for direct immersion, providing accurate real-time water temperature monitoring.
• Equipped with automatic recycle logic to restore operation automatically after cooling.
• Technical specifications include a robust 100°F to 240°F temperature range for versatile high-limit settings.

Common Questions

Which boiler models work with the 510-312-015?
This high-limit control is engineered specifically for Weil-McLain gas boilers, including the HE, HE II, and VHE series. Always verify the part number against your specific boiler wiring diagram before installation.

Does this Aquastat include the immersion well?
Yes, the 510-312-015 comes as a kit that includes the immersion well, though it is also compatible with existing wells if the threads and depth match the sensor bulb. Using the new well is recommended to ensure optimal heat transfer.

What is the function of the adjustable differential on this control?
The 510-312-015 adjustable differential allows contractors to set the temperature drop required before the boiler restarts. A wider differential can improve efficiency by reducing the frequency of burner starts.

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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.