White-Rodgers 752-1 Switch

The White-Rodgers 752-1 is a high-performance SPDT changeover switch engineered for hydronic systems utilizing 1/2-inch (5/8-inch O.D.) tubing. Built for demanding mechanical environments, this automatic changeover control facilitates the critical transition between heating and cooling circuits in combination hot and chilled water systems. It eliminates the need for manual intervention by automatically toggling the thermostat to operate the appropriate zone valve based on line temperature, with precise set points that open at 85°F and close at 70°F. The heavy-duty bimetallic disc sensing element is curved for maximum surface contact with the copper pipe, while the snap-action contacts are sealed in an epoxy resin to prevent ingress from dust, dirt, and oil.

Equipped with 12-inch color-coded leads (red, brown, and black) and a 105°C insulated No. 18 wire, the 752-1 changeover switch is designed for straightforward integration into existing control logic. For contractors managing HVAC zone valve control, this unit serves as the direct replacement for the 753 series and older changeover models. This hydronic piping switch is rated for a maximum ambient temperature of 220°F and is furnished with a removable spring clip for quick, secure attachment to the piping, ensuring a reliable line voltage control interface for boiler, chiller, and circulator operations.

• Efficient Automation: Provides seamless SPDT automatic changeover to switch thermostat control between heating and cooling circuits.
• Enhanced Durability: Epoxy resin seal shields internal snap-action contacts from corrosion and job-site debris.
• Precise Thermal Transfer: Curved sensing element ensures high-conductivity contact for accurate temperature sensing on 1/2" tubing.
• Contractor-Friendly Install: Features 12" leads and a standard conduit connector to simplify wiring in restricted mechanical spaces.
• Broad Compatibility: The 752-1 is an industry-standard replacement switch for many legacy zone control systems.

• What are the specific temperature set points? The switch is calibrated to open the red-to-black circuit at 85°F (+/- 6°) and open the red-to-brown circuit at 70°F (+/- 6°).
• Can this be used on 3/4" tubing? No, this specific model is sized for 1/2" (5/8" O.D.) tubing; however, it is the modern direct replacement for several older 3/4" series switches when adapted to modern piping configurations.
• Is a conduit connector included? Yes, this model includes the built-in conduit connector for secure electrical housing integration.

This item is not eligible for free shipping.

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.