The PSR-B was developed to provide a solution for irrigation controller and pump start relays installations that have insufficient power to energize the pump relay. A common cause for this problem is the use of too small a wire size for the distance from controller to the pump start relay. The PSR-B allows the operation of the pump start relay through the PSR-B relay, which requires only a small amount of current draw. For correct wire sizing where the PRS-B is not required, please click on the following link: PSR Wiring Chart.
NOTE: Connecting the Pump Start Relay Booster should only be done by a licensed electrician following local codes. Improper installation could result in shock or fire hazard.
NOTE: Be sure to install a wire nut on the unused brown or black wire.