Weil McLain 511-624-532 Pressure Switch

The Weil McLain 511-624-532 Differential Pressure Switch is an SPST switch with a 0.30 inch W.C. set point, rated for installations from sea level to 4,000 ft. In Weil McLain's AHE parts list it is the pressure switch shown for the AHE-60, which makes it a manufacturer-specified part and not a general-purpose cross-fit. The switch is supplied on a mounting bracket, as shown in the photo.

A differential pressure switch like the 511-624-532 monitors the pressure difference created by the combustion air blower and closes its contacts when that difference reaches the set point. The boiler control reads that closure as proof that combustion air is moving, and only then does it continue the ignition sequence. SPST means single pole, single throw, so there is one set of contacts that is either open or closed. If airflow falls below the set point because of a blocked vent, a restricted intake or a failing blower, the contacts open and the control holds the burner off.

Set point and elevation range are both part of the specification, and they differ between models. Weil McLain also lists 511-624-530 as a 0.35 inch W.C. switch for the AHE-45, and the two are not interchangeable with 511-624-532. Confirm the set point printed on the switch you are replacing before you order, and never bypass the switch to run the boiler.

Key Benefits

• AHE-60 Specific: Weil McLain's AHE parts list shows 511-624-532 as the pressure switch for the AHE-60, so you are ordering the manufacturer's own part.
• 0.30 Inch W.C. Set Point: The proving point is matched to the boiler's combustion air system, with a rated range from sea level to 4,000 ft.
• Simple SPST Contacts: A single set of contacts that closes on adequate airflow keeps the wiring straightforward and easy to check with a meter.
• Mounting Bracket Included: Supplied on its bracket so it can be mounted the way the original switch was.

Common Questions

• What is the set point of the 511-624-532? 0.30 inch W.C., SPST, rated for sea level to 4,000 ft.
• Is it the same as 511-624-530? No. The 511-624-530 is a 0.35 inch W.C. switch that Weil McLain lists for the AHE-45. The 511-624-532 is the 0.30 inch W.C. switch listed for the AHE-60.
• Which boiler uses the 511-624-532? The Weil McLain AHE parts list shows it for the AHE-60. Send us your boiler model and serial number if you want our team to double-check fit before you buy.

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.