This control is specifically optimized for refrigeration pressure control where unmonitored equipment requires a fail-safe manual intervention circuit after a high-pressure event

typically used for the blower motor

or a complete seized motor resulting in a "No Heat" service call

Precise Pressure Sensing: Utilizes time-tested bellows technology to maintain a 9 PSI fixed differential for consistent performance across non-corrosive refrigerants

Standardized Output: Provides a consistent 0-10 VDC or 4-20 mA output (depending on configuration) for universal controller compatibility

Weil McLain 383-500-407 Burner Replacement Kit Refrigerant This control is specifically optimizedWhen you are troubleshooting an Ultra Gas Boiler that isn't maintaining a stable flame or is showing signs of combustion instability, the Weil McLain 383 500 407 Burner Replacement Kit is the specified OEM solution for Ultra 299 and Ultra 399 Series 1 and 2 units. This professional grade kit is engineered to restore the precise fuel to air mixture required for high efficiency condensing applications. As a genuine Weil McLain part, it ensures that the