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Taco SR503-EXP-4 - 3 Zone Switching Relay w/ Priority - Note: Image may not the main loop pump on all the time unless i manually shut the switch off. Taco's Enhanced Switching Relays are the best choice for all your zoning needs, with advanced timer and boiler functions, external diagnostic lightsThe Taco Zone Switching Relay - Three Zones - Expandable SR503-EXP-4 has been discontinued SR503-EXP-4 Taco SR503-EXP Switching Relay Instruction Manual. must be followed so power originates from the boiler aquastat. Failure to follow these wiring instructions may result in a secondary source of power being View and Download Taco SR503-EXP-4 instruction sheet online. Switching Relay. SR503-EXP-4 relays pdf manual download. Taco SR503-EXP Pdf User Manuals. View online or download Taco SR503-EXP Wiring Manual. Boston Heating Supply has the Taco SR503-EXP Three Zone Pump Switching Relay in stock. We also have many other products Product Manuals and Downloads: