Taco Sr506 Wiring Diagrams. 120 vac wiring must have a minimum temperature rating of 75c. March 1 2013 effective.
Sr506 6 with priority 120 vac input 20 amps 11 3 4 7 1 2 3 all switching relays are relay type dpst have a thermostat current of 18 and have a single phase motor rating per zone of 1 3 hp 7 2a 120 vac. March 1 2013 effective. Sr506 exp 4 switching relay 102 365 supersedes.
Taco sr502 wiring diagram.
However i found this newer diagram directly from taco which has a common terminal clearly marked where the old one just says 24 vac power. As with you my old thermostat only needed 2 wires and the wiring to it i tried to connect a honeywell rtf wifi thermostat to my taco. Failure to follow these wiring instructions may result in a secondary source of power. Cold start boiler application.