Cleveland Controls NS2-0172-00 Pressure Switch

The Cleveland Controls NS2-0172-00 Pressure Switch is the manufacturer-designated direct replacement for RSS-495-172, engineered for high-accuracy air flow sensing in residential and light commercial HVAC systems. This air pressure sensing switch features a durable glass-filled polycarbonate body and a resilient silicone diaphragm, ensuring stable performance across a broad operating temperature range of -40°F to 180°F. As a veteran technician knows, the switch is designed to sense positive, negative, or differential pressure with a narrow switching differential for precise limit control. Note that during installation, you must replace the existing 3/8" nut for 1/4" tubing with the included 7/16" nut to ensure a leak-proof seal. This HVAC pressure switch is factory-calibrated but versatile, accommodating various sample line connectors via its color-coded pressure ports (Black for positive, Gray for negative). Its integral snap-acting switch and 90° male quick-connect terminals provide a reliable electrical interface for furnace pressure switch applications, maintaining system safety and efficiency even in contaminant-heavy environments.

• Precise Airflow Monitoring: Provides high set-point stability and narrow differential control to prevent short-cycling.
• Streamlined Retrofit: Specifically kitted to replace obsolete RSS-495-172 units with the essential 7/16" nut hardware included.
• Rugged Construction: Contaminant-free design with a glass-filled polycarbonate housing for long-term field reliability.
• Versatile Application: Capable of sensing positive, negative, or differential air pressure in diverse pneumatic configurations.
• Safe Operation: Industrial-grade silicone diaphragm performs consistently from -40°F to 180°F.

Is the NS2-0172-00 a perfect match for my old RSS-495-172?
Yes, it is the official direct replacement. However, you must use the supplied 7/16" nut for your 1/4" tubing, as the original 3/8" nut from the RSS series will not thread onto the new NS2 body.

What is the correct mounting orientation for this switch?
To maintain factory-calibrated set-point accuracy, the switch should be mounted with the diaphragm in a vertical plane. Mounting at other angles may shift the activation point due to the weight of the internal components.

Which ports do I use for a differential pressure setup?
Connect the higher pressure (or positive) sample line to the Black port and the lower pressure (or negative/vacuum) line to the Gray port.

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.