Macon Controls EVO-28 Sensor

The Macon Controls EVO-28 Sensor is a professional-grade, self-acting thermostatic operator engineered for precise radiator temperature control in hydronic and low-pressure steam systems. As the direct replacement for MTW-28, this non-electric thermostatic head features a built-in sensor and a direct mount design that eliminates the need for external capillary tubes. Built with heat-resistant thermoplastic and a low-lead brass nut, the EVO-28 provides a thermostatic radiator valve (TRV) solution that maintains an adjustable temperature range of 50°F to 82°F. It is fully compatible with all Macon NT series valves and conforms to ASHRAE standardization for temperature regulation, offering a 0.9°F hysteresis for tight environmental control. Designed for high-performance mechanical rooms, this unit handles maximum steam pressure up to 15 psig and maximum water temperatures of 250°F. The integrated frost protection and manual shut-off capabilities ensure system safety and flexibility during seasonal maintenance or unoccupied periods.

• Universal Compatibility: Serves as a 1:1 MTW-28 replacement, mounting directly to existing NT series valve bodies without system drainage.
• Precision Calibration: Features a self-acting sensor with a 0.125-inch maximum movement to provide accurate modulation and prevent room overheating.
• Advanced Limiting: Includes hidden temperature locking and high/low limit stops to prevent unauthorized adjustments in public or multi-unit residential spaces.
• High Durability: Engineered to withstand a maximum differential pressure of 20 psi and ambient temperatures up to 122°F.

What valves are compatible with the EVO-28?
This operator is designed specifically for Macon NT Series valves. If you are retrofitting older valves from other manufacturers, an Umbrella Adapter may be required for a secure fit.

How do I set the maximum and minimum temperature limits?
The EVO-28 utilizes a limit tool located behind the dial window. By depressing the adjustment pins, technicians can lock the rotation of the handwheel to a specific setpoint range.

Can this be used on steam radiators?
Yes, it is rated for low-pressure steam up to 15 psig. For one-pipe steam applications, ensure you are using the correct Macon steam air vent and valve configuration.

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.