SR504-EXP-1 Taco 4 Zone Switching Relay With Priority & 3 Ports

• Switching Relay
• Item Switching Relay
• Type Compact, Sealed, Zone
• Applicable Standard UL, CSA
• Switch Type DPDT
• Overall Dimensions 10-1/4" Width x 2-3/4" Depth x 6-3/4" Height
• Current Rating 20 Amp
• Input Supply Rating 120 Volt AC
• Inclusions/Features Front Diagnostic Light, Isolated End Switch, Field Replaceable Transformer, Power Control Plug
• Application Cold Start Boiler/Tankless Coil Boiler
• Number of Zone 4
• Warranty 3 Year

Install Instructions

Taco Switching Relay Combine Clearly-Labeled Pc Board Layouts with Advanced Features that Allow to Completely Customize System; Whether Using Basic Priority Switching, Taco Plug-In Power Port Cards/Add-On Power Control, Tailoring the System has Never Been Easier; External Indicator Lights Give Instant Diagnostic Feedback, Making Service Calls/New Installation Start-Ups a Snap; Use Standard "Ice Cube" Replaceable Relay and are Compatible with Conventional and Programmable Thermostat; Switchable Priority; Built-In Priority Protection; Simplified Wiring; Fuse Protected; 100 Percent Factory Tested; Contractor Friendly Pc Board Layout; Universal Thermostat Compatibility; Built-In; Switchable Primary Circulator Output; Two Boiler Contact, Utilizes Full Functionality of Mod-Con Boiler; Interface with -Exp Zone Valve Control; Expandable to 20 Zoning Panel; Interface with -Exp Zone Valve Control; Extended 3 Year Warranty