Hi,
I'm a home owner with an old Hydrotek model 2520 with a two zone Hydrotek 4000 valve system. I recently purchased the Hunter Xcore however don't know how to install it as the wiring is different. The old system uses 220 VAC with copper wires and I don't know how to install the hunter X-core with this configuration.
If there's a pump in the sprinkler supply, then you shouldn't have bought the X-Core. The original controller is designed to directly power a pump, and to provide the delay between zones that is needed by the indexing valve that feeds the two zones.