Rheem-Ruud 47-21604-03 Limit Switch

The Rheem-Ruud 47-21604-03 High Pressure Limit Switch is a critical safety component engineered for precise refrigerant pressure management in residential and commercial condensing units. This OEM Rheem replacement part features a factory-calibrated 440 PSI open setpoint, ensuring the system interrupts the control circuit before excessive head pressure causes terminal compressor failure or mechanical fatigue in the refrigerant lines. Designed with a 36-inch capillary tube and a 3/32" sweat connection, this switch provides the necessary reach and secure fitment for high-vibration HVACR environments.

As a manual reset pressure switch, the 47-21604-03 requires a technician’s intervention after a trip event, serving as a diagnostic signal to investigate airflow restrictions, fan motor failures, or non-condensables in the system. The snap-acting, trip-free mechanism prevents the switch from being held closed during a fault condition, maintaining strict safety protocols. Rated for 375 VAC with a single-pole, single-throw (SPST) normally closed configuration, this limit switch is built for long-term reliability in specialized heat pump and air conditioning applications.

• Precise System Protection: Triggers at 440 PSI to prevent high-side over-pressurization.
• Flexible Installation: The 36-inch capillary length and 38-inch wire leads accommodate various cabinet configurations.
• Durable Connection: Features a 3/32" sweat connection for a leak-resistant, permanent interface with the liquid line.
• Manual Reset Security: Ensures the system is inspected by a contractor before resuming operation after a high-pressure trip.
• Wide Compatibility: Direct replacement for several ProTech and Rheem-Ruud part numbers, including 47-20458 and 47-100326 series.

Is the Rheem 47-21604-03 an automatic or manual reset switch?
This is an OEM manual reset limit switch. Once the pressure hits the 440 PSI threshold and the switch opens, a technician must physically press the reset button after correcting the underlying fault.

What does the 440Op specification represent?
The 440Op indicates that the switch is calibrated to "Open" the electrical circuit when the system pressure reaches 440 PSI, effectively shutting down the compressor for safety.

Can this switch be used in heat pump systems?
Yes, the 47-21604-03 is commonly utilized in Rheem and Ruud RPMC series heat pumps and packaged units to monitor high-side refrigerant pressures during heating and cooling cycles.

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.