Taco switching relays combine clearly labeled PC board layouts with advanced features that allow for total system customization. Whether using basic priority switching or the advanced features of the EXP controls, the job is made easy. External indicator lights provide instant diagnostic feedback, making a snap of service calls or new installation start-ups. All switching relays are UL listed, are compatible with conventional and programmable thermostats.

Taco Comfort Solutions® Switching Relay, 120 VAC, 2-3/8 in Overall Length, 4-7/8 in Overall Width, 6-5/8 in Overall Height, For Use With: 2, 3 and 4-Wire Zone Valves

• Front diagnostic lights
• Switchable priority
• Built-in priority protection
• Simplified wiring
• Compact design
• Fuse protected
• 100% factory tested
• 2 pump end switches can control up to 3 pumps, system, secondary and DHW
• Contractor friendly PC board layout
• Universal thermostat compatibility
• 24 V power output for hard wired thermostats
• Field replaceable transformer

• Instruction/Installation Manual https://assets.unilogcorp.com/267/ITEM/DOC/Taco_Comfort_Solutions_SR501_4_Instruction_Installation_Manual.pdf
• Specification Sheet https://assets.unilogcorp.com/267/ITEM/DOC/Taco_Comfort_Solutions_SR506_4_Specification_Sheet.pdf