@rpw128 - For just two zones I would put in two Single Pole Single throw (SPST) normally open relays that would active the side yard master valve that is on zone 5. The relays are inexpensive, ~$7-8 last time I looked.
Here’s is how one would wire it up:
Zone 6 - two wires, one to the Lawn West and one to the coil wire on the relay.
Relay - other size of the coil wire to C(ommon)
Relay Common - 24 V- VAC (if you have a Gen 3, then I think you’d use the 24-VAC terminal and a Gen 2 I believe you’d use the SC (@Gene determined this is right one to use, instead of SP) - unless Rachio has changed things with the Costco version or an updated hardware.
Relay Normally Open Pole - output to the Side Yard Supply valve, can be combined together with the other relay pole.
Zone 7 - two wires, one to the Side Garden and one to the coil wire on the relay.
Relay - other size of the coil wire to C(ommon)
Relay Common - 24 V+ VAC (if you have a Gen 3, then I think you’d use the 24+VAC terminal and a Gen 2 I believe you’d use the SC (@Gene determined this is right one to use, instead of SP) - unless Rachio has changed things with the Costco version or an updated hardware.
Relay Normally Open Pole - output to the Side Yard Supply valve, can be combined together with the other relay pole.
For relay, look for one with a 24 VAC coil that is normally open.
As an example:
One can use a SPDT (Single Pole Double Throw) relay, instead of the SPST, just use the Normally Open and Common tabs (don’t use the Normally Closed tab).
Let me know if you have any questions, the wiring and relays are easy and will all be right there by the Rachio.