Taco 503 Switching Relay Wiring Diagram

Use the cold start wiring diagram.

Taco 503 switching relay wiring diagram. No end switch must use jumper taco 3 wire zone valve 1 2 3 jumper 3 4 motor end switch 4 wire power open self closing jumper 3 4 power controls zvc 404 exp 4 four zone expandable zone valve control factory installed transformer 24 vac 120 vac input white black power in 24 vac 120 vac factory installed transformer 24 vac input white black no com nc pump end switch zone 4 pump end. I have a taco sr503 4 three zone switching relay. Sr503 exp 4 relays pdf manual download. Thermostat installation wiring diagrams.

All switching relays are relay type dpst have a thermostat current of 18 and have a single phase motor rating per zone of 13 hp 72a at 120 vac. The taco sr503 4 zone switching relay has a built in 24v transformer that is only. External indicator lights priority simplified wiring fully enclosed snap out relays fuse protected outputs compact design 100 factory tested isolated end switch contractor friendly pc. External indicator lights plug in powerport cards switchable priority simplified wiring add on power.

Sign in. March 1 2006 plant id 9300 860 features. Taco sr503 4 three zone switching relay question. The current thermostats use batteries and two wires r w.

Instruction sheet sr503 exp switching relay 102 086 supersedes. Ev607797 nc i believe that those are just relay contacts. Youll need to provide a 24 volt power source transformer and a slave relay to actually provide the switching of an. The sr501 exp taco switching relay is the best choice for all your zoning needs with advanced timer and boiler functions external diagnostic lights switch.

I dont see a common to connect the c wire. Taco sr 503 switching relay runnning circulator pump. Tt on boiler 120 volt circulators zc zr x x end switch zone1 zone2 zone3 zone4 power input sr 504 zone 2 power zone 1 zone 3 zone 4 jumper t wr com 3 wire thermostat 3 wire. 3 wire thermostat connected to taco switching relay boiler h n t t t four zone switching relay with optional priority zone 4 on off priority 120v relay fuse 1 amp 24 vac power zone 1 zone 2 zone 3 zone 4 120 vac input to.

The tankless coil refered in diagram 2 is a boiler that maintains temperature not a wall hung tankless. Primary circulator optional for cold start boiler application. Taco zone controls wiring guide pages switching relays single zone wiring 2 12 switching relays non exp connected together with priority 3 19 switching relays exp connected together with priority 10 11 switching relays multiple indirect hot water heaters 12 13 switching relays exp connected to reset controls pc700 702 705 14 21 zone valve controls. Where should i connect common for the ecobee3 thermostats.

All switching relays are relay type dpst have a thermostat current of 18 and have a single phase motor rating per zone of 13 hp 50a at 120 vac. Taco zone controls wiring guide pages switching relays single zone wiring 2 2 switching relays oil boiler wiring safety notice 2 3 4 switching relays non exp connected together with priority 5 11 switching relays exp connected together with priority 12 14 switching relays multiple indirect hot water heaters 15 16 switching relays exp connected to.