Pump Start Relay With Common Wire

If you are using a Pump Start Relay, or PSR, there will be two wires for the 24V connection. The gray port of the far right side of the wiring block on your Blossom controller is reserved for use for your PSR. Insert one of the wires from the PSR into this gray port. The other wire will be plugged into either one of the two black "common" ports.