RT 260A (017D002466) Danfoss Pressure Switch RT Series

Product Overview

The RT 260A (017D002466) is a high-performance differential pressure switch engineered for critical regulation and monitoring within industrial HVAC, marine, and refrigeration plant sectors. This heavy-duty component provides reliable pressure control for liquid and gaseous media, ensuring operational stability in complex systems like pumping stations and cooling towers. By integrating the Danfoss RT 260A into your automation architecture, you effectively mitigate the risk of pump cavitation and system overpressure, significantly reducing unscheduled downtime and extending the lifecycle of downstream assets such as compressors and boilers. Its robust bellows design is optimized for durability in harsh environments where vibration and mechanical stress are prevalent.

Technical Configuration

The RT 260A features a specialized differential pressure mechanism utilizing a single-pole changeover (SPDT) switch system. The internal architecture consists of two balanced bellows—the LP (Low Pressure) and HP (High Pressure) sides—acting against a precision-calibrated spring. The "A" suffix in the RT 260A designation indicates that the unit is specifically designed for use with ammonia (R717) and other non-corrosive fluorinated refrigerants, featuring high-grade steel bellows to prevent chemical degradation. The adjustable neutral zone is absent in this specific configuration (fixed at 0), providing a direct and repeatable response to pressure fluctuations across a regulation range of 0.5 to 6 bar.

Technical Specifications

Technical FAQs

Is the RT 260A compatible with ammonia systems?

Yes, the RT 260A is specifically engineered with high-strength materials compatible with R717 (Ammonia) as well as standard fluorinated refrigerants.

What is the primary difference between the RT 260 and the RT 260A?

The "A" version incorporates stainless steel bellows and specialized seals, making it suitable for aggressive media like ammonia, whereas the standard RT 260 typically uses copper alloy bellows.

How does the mechanical differential affect system performance?

The 0.5 bar differential determines the reset point of the switch. Once the set pressure is reached, the pressure must drop by 0.5 bar before the contacts return to their original state, preventing rapid cycling or "chatter" of the connected equipment.

Engineering & Installation Guide

• Pressure Connection Integrity: Use a 14 mm wrench to secure the G 3/8 A connection. Ensure the pipe is properly deburred and flushed before mounting. For ammonia applications, use only steel or authorized synthetic gaskets; avoid copper washers which will corrode rapidly.

• Vibration Mitigation: While the RT series is designed for industrial use, mounting the switch on a vibration-damped bracket is recommended if installed near high-frequency reciprocating compressors. This ensures the accuracy of the setpoint and prevents premature contact wear.

• Wiring Safety: When wiring the SPDT contacts, ensure the cables are routed through the PG 13.5 cable entry to maintain the IP66 seal integrity. Use ferrules on stranded wire to prevent short circuits within the compact terminal housing.