Tech Tip #10 Remote Relay Unit The Remote Relay Unit (RRU) is used at remote locations when it is desirable to control several large loads such as second service panels, hot tubs, electric furnaces or electric boilers by simply running low-voltage wire loads to the remote location instead of trying to work with high-voltage, high-current wires. The RRU contains: Four double-pole, single-throw (DPST) relays. Relay coil wiring harnesses (one for each relay), and Relay coil wiring harnesses (for connecting remote relays to the controller board). Note: RRUs are available with one to eight relays. The unit shown below is standard. Click on image for a close-up view Hook-up 1. Install the RRU at the desired location. 2. Run low-voltage wire from the control unit location to the location of the RRU. Use the same number of conductors as wires in the wire harness of the remote unit, two per relay. 3. Wire-nut the low-voltage wires to the remote unit wire harness. Be sure to write down the wire color matchups. 4. Wire to the contacts of the relays, just as you would if you were wiring the control unit. You may need to refer to the particular unit's installation manual or its appropriate Tech Tip to be sure this is correct. Always follow NEC and/or local codes. 5. Attach the other end of the low-voltage wires to the harnesses supplied for attaching to the contoller's logic board. See the diagram. 6. Remove the cover from the controller's logic card to make it easier to attach the plugs to the logic board's output jacks. Plug each remote relay's plug into the desired control point jack on the controller's logic board. 7. Connect the wires to the logic card as shown in the diagram. a) You may move the relays already connected to the controller to other positions, or you may disconnect them as required to achieve the desired control point position. b) The diagram shows one such hookup. Obviously, many combinations are available. See the table below for some possible combinations. Caution Do not common any relay wires together. Switching Order The Energy Sentry® RRU uses four DPST relays with an 8-wire harness (two for each relay). These wires are tied into the main control unit via an 8-conductor, 18-gauge wire that connects to the control point output jacks on the logic board with the connectors provided. The switching order depends on the priority programmed for each auxiliary relay. Remote Relay Unit: Example of Priority Hookups   Electric Furnace or Electric Boiler Last Shed 24-hour control First Shed Relay 1 2 3 4 5 6 7 8 Load Dryer Optional (A/C) 5KW Heat Water Heater 5KW Heat 5-10KW Heat 5-10KW Heat     Heat Pump with Individual Element Control Last Shed 24-hour control First Shed Relay 1 2 3 4 5 6 7 8 Load Dryer H.P. Compressor Water Heater 5KW Heat 5KW Heat 5KW Heat 5KW Heat   Return To Tech Support Go To Next Tech Tip

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