On the front cover of the receiver you willsee that there is the On/Off switch and twoLight Emitting diodes (LEDs). The switchallows you to turn off the receiver ifnecessary to prevent it calling for heat. Thetop LED (red) will illuminate when theswitch is in the ‘On’ position and the unit isreceiving power. The top LED (green)illuminates when the receiver isreceiving a heat call transmission from thethermostat. The wiring terminals and RF Address Code setting DIP switchesare located on the rear of the receiver, as shown above:RECEIVER WIRING TERMINALSTerminal Identifier Description1 NO Normally Open (N/O) Volt free contacts2 COM Common terminal (COM) Volt free contacts3 L Live supply (230V AC)4 N NeutralTYPICAL WIRING INSTALLATIONSThe RT receiver is wired the sameway no matter if you are wirings230V or 24V, the receiver willalways need a 230V Live andNeutral feed connected into L &N terminals. The COM and NO isto be connected to the boilersexternal loop (see diagrambelow), if connected in this waythe receiver relay can only switchvoltage supplied by the boiler.RECEIVER BOILERMAINSFEEDNLN.O. COM L NThermostat loop (Remove link)Live FeedN L SL L N ERXRT505 INSTRUCTION MANUAL6