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That's what I was thinking BUT if you look at a wiring diagram for them you will see that terminals 2 & 3 are shown wired directly to TT on the boiler control without any indication of an isolation relay. Guess I'll call Taco today. Out of curiosity if nothing else.. Taco Circulator Relay SR501, SR502. Circulator Pump Relays SR503, SR504, SR506. Hydronic Heating System. TACO ZONE CONTROLS WIRING GUIDE Pages Switching Relays – Single Zone Wiring 2 – 2 Switching Relays – Oil Boiler Wiring Safety Notice 2 3– 4.
Taco SR501-4 Switching Relay / Honeywell RA832A Switching Relay - Taco SR502 pump relay wiring markup 2.png Source. Honeywell Wiring Diagram - Wiring Diagram And Schematics - Honeywell 28mm 2 Port Valve Wiring Diagram Diagram . Source. Honeywell Wireless thermostat Wiring Diagram Best Of Replacing - Honeywell Wireless thermostat Wiring Diagram Best Of. The SR501-HC-4's enclosure is unobtrusive and easy to mount in tight spaces, and the PC board was designed for quick maintenance and clean, simple wiring. Simple Servicing Easy-to-interpret external diagnostic lights and "ice cube" style replaceable relays mean that servicing a Taco. Zone Valve Wiring Hookups for Hydronic (Hot Water) Heating Systems. Individual Hydronic Heating Zone Valve & Control Wiring Notes by Brand. Illustration: the wiring diagram for the Taco ZVC 403 Multiple-Zone-Valve Controller..
The Taco SR503-4 Switching Relay is the best choice for all your zoning needs, with advanced PowerPort Cards, external diagnostic lights, switchable priority and contractor friendly PC board layouts..