SR503-EXP-4 | 3 Zone Switching Relay w/ Priority | Taco

3 Zone Switching Relay w/ Priority

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Taco Switching Relays combine clearly labeled PC board layouts with advanced features that allowfor total system customization. Whether using basic priority switching or the advanced featuresof the -EXP controls, the job is made easy. External indicator lights provide instant diagnosticfeedback, making a snap of service calls or new installation start-ups. All switching relays are ULand CSA listed, use standard ?ice cube? replaceable relays and are compatible with conventionaland programmable thermostats.

Whether you want to expand up to 20 zones or utilize the advanced features of the PowerPortCards and Add-on Power Controls, Taco -EXP controls allow for simple integration of advancedfeatures. Plug in any combination of cards and controls to optimize the operation of any system.

Features include:

• External Indicator Lights
• Switchable Priority
• Simplified Wiring
• Fully Enclosed Snap-Out Relays
• Compact Design
• Fuse Protected
• 100% Factory Tested
• Isolated End Switch
• Contractor Friendly PC Board Layout
• Universal Thermostat Compatibility
• UL and CSA Approved
• 24 Volt Power Input or Output Terminal
• Extended 3 Year Warranty
• Made in the USA

Additional -EXP Features

• Plug-in PowerPort Card Slots
• Add-on Power Control Plug
• Expandable to 20 Zones
• Interface with -EXP Zone Valve Controls