Topic(s): Device HelpRC2 – ARC – ST8

Wiring a Pump Start Relay to the RC2 Controller

The RC2 supports the use of a pump start relay when your irrigation system includes a pump. This section explains how to wire the relay to the controller and safely connect power.

⚠️ WARNING
DO NOT route the pump start relay wires through the same opening as the power wires.

NOTICE
A pump start relay connects to the controller in the same way as a master valve, but connects differently at the water source. This controller DOES NOT provide power for a pump. A relay must be wired according to the pump manufacturers’ installation instructions.

1. Using a direct burial cable, connect one of the wires from the pump start relay to the master valve terminal (M).
2. Connect the remaining wire from the pump start relay to the common terminal (C).
3. To avoid possible pump damage in the event run times are assigned to unused zones, connect a short jumper wire from all unused zone terminals to the nearest zone terminal in use.
4. For detailed installation and operation of pump start relay, refer to pump manufacturer’s installation instructions.

Connect Power

• The controller can be installed indoors or outdoors (if plugged into a weatherproof external outlet).
• The controller has an internal transformer that reduces supply voltage from 230 V~ to 24 V∼. You will need to connect power supply wires to the transformer’s three wires (live, neutral, ground). Refer to “Connect Fixed Wiring” section for installation details.

⚠️ WARNING
Electric shock can cause severe injury or death. Ensure power supply is turned OFF before connecting power wires. Never plug in or apply power to the controller until you have completed and checked all wiring connections. Disconnect or turn off the external power source before connecting or disconnecting wiring to the controller.