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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. 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. 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: 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. 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