The Robertshaw 2353-501 R503-1 is a pneumodular diverting relay designed to control the direction of pneumatic signals in HVAC and building automation systems. Operating within a 3–20 PSIG input range, this relay redirects air pressure between output ports based on signal strength, making it ideal for applications that require selective control of pneumatic devices. Compact and modular, the R503-1 integrates easily into control panels and field-mounted systems.
Technical Specifications
• Model: 2353-501 R503-1
• Type: Pneumodular Diverting Relay
• Signal Range: 3–20 PSIG
• Function: Directs pneumatic output based on input signal strength
• Ports: Multiple output paths for selective routing
• Mounting: Panel or snap-track mount
• Manufacturer: Robertshaw
Key Features
• Diverts pneumatic signals to alternate outputs
• Operates within standard 3–20 PSIG range
• Modular design for quick installation and maintenance
• Improves flexibility in pneumatic control logic
• Ideal for sequencing and conditional control setups
• OEM-grade reliability for HVAC and automation systems
Compatible Components & Accessories
• Pneumatic thermostats and transmitters
• Actuators and dampers
• Control panels and snap-track systems
• Robertshaw modular pneumatic components
Industry Applications
• Commercial HVAC zoning and sequencing
• Building automation pneumatic logic circuits
• Industrial process air routing
• Pneumatic control panels and logic systems
• Retrofit and expansion of control systems
Installation & Maintenance Notes
• Mount relay securely on panel or track
• Connect pneumatic tubing to input and output ports
• Confirm pressure range compatibility before operation
• Test output direction with varying input pressure
• Inspect periodically for leaks, dust, or diaphragm wear
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