RADIANT SERVICES™ INSTALLATION OPERATION AND SERVICE M ANUAL58SECTION 14: OPERATIONFigure 35: Sequence of Operation Chart14.1 Heater Lockout Indication (Optional)In case of flame loss during operation of the heater, theburner control unit goes to lockout mode after threeignition trials. At this stage a 230 V signal is providedwhich enables the RADIANT SERVICES™ controller,BMS system, etc. to indicate precisely which heater hasfailed. If your heater is equipped with "Heater Lockout"indication, an additional wire has to be installed from theheater’s lockout indicator connector to the monitoringcomputer. See Page 58, Figure 35 for alarm sequence.Cut/Pinch HazardWear protective gearduring installation,operation and service.Edges are sharp.WARNINGFailure to follow these instructions can result in death, electric shock, injury or property damage.Burn HazardAllow heater to coolbefore service.Tubing may still be hotafter operation.Explosion HazardTurn off gas supply toheater before service.DANGERElectrical Shock HazardDisconnect electricbefore service.More than onedisconnect switch maybe required todisconnect electric fromheater.Heater must beconnected to a properlygrounded electricalsource.PPFan NeonBurner NeonNeonIgnitionGasValveFlameSensingPressureSwitchFanThermostatKEY TOSYMBOLST0 T1 T2 T3 T4 T5 T6 T710 secTp40 sec max. Interruption of mainTp10 secTs10 secflame sensing11 sec typicalT8Lockout AlarmSignal (optional)Burner Lockoutsignal received after3 ignition trialfailures
