I bought a taco sr503 zone controller off the internet. I had to purchase the relays separately. I am having trouble getting it to work. I can put it in reset mode and a two wire thermostat will generate a red light showing the zone is turned on but the 120 volt circulator is not energized. I have the ZC and ZR jumpered but there is no end switch. In normal mode all I get is the one green light showing the unit is working but no response (red light) when the thermostat calls for heat. The relays are all the same, 120volt coil Ice cube DPDT relays. Do I need different relays or is it something to do with not having an end switch?

The setup is a Polaris 130000 BTU 50 Gal with 3 Zones + DHW. One zone is an air handler. The other two are radiant zones. It is an open system. All I need are the circulators to come on when the tstat calls for heat. The water heater will come on if its tstat senses a drop in temp so there is no need to conect it to the SR503.

Any Ideas?