This allows two RC Series controllers to be linked together.
The first controller is used to start the second controller.
The second controller will not start without the first controller
telling it to do so. This is useful when there are multiple
controllers on the job and two stations cannot operate together.
The second controller will automatically start when the first
controller reaches the last station. Do not connect the common
wire between the controllers. This violates National Electric
Code. If this is already done, refer to the Relay
Design For Looped Commons Technical Update.
How It Works
Install a 24 VAC relay (Rain Bird part number 621970)
in the second controller. Connect a wire from the relay
terminal B to the common of the first controller. Connect
a wire from relay terminal A to the last station of the
first controller. This will energize the relay when the
first controller reaches its last station.
The second controller must have a minor modification made
to it. The RED wire that connects to the DAY DIAL microswitch
must be cut and reconnected to the previously unused NC
(normally closed) terminal.
Install a wire from relay terminal 9 also to the NC terminal
on the DAY DIAL microswitch.
Install a wire from relay terminal 6 to the COM (common)
terminal of the HOUR DIAL microswitch. The existing YELLOW
wire should remain connected to the COM terminal.
Programming
The day and hour dials on the second controller do not affect
the operation of the first controller. The controller does
not respond to days on and start times set on these dials.
The controller may still be operated manually by rotating
the station dial counter-clockwise.
Adjust the time on the last station of the first controller
to its minimum setting (3-5 minutes). When controller one
reaches this station, controller two will start.
