Laars NeoTherm NTH Installation And Operation Instructions Manual

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Laars NeoTherm NTH Installation And Operation Instructions Manual Manual pdf 47 page image

NeoTherm Boilers and Water Heaters Page 47appliance. Remove the front door to the appliance andthe control panel plastic bezel. Remove all wireconnections from the control board. The control boardconnections are keyed to only allow connection in theproper location, but proper handling techniques shouldbe used to avoid damage to the wiring or connectors. Toremove the control push in on the two tabs on the leftside of the board to unlatch the clips from the controlpanel. Rotate the control around the fastening points onthe right side of the control to remove the hooks fromthe control panel. To replace the control repeat the stepsabove in the reverse order making sure to connect allwires in the proper location. Place the appliance inoperation following the steps outlined in Section 10.11.2.4 Ignitor AssemblyThe ignitor assembly is a two rod system thatconsists of a ground rod and a sense rod. To remove theignitor assembly, shut off the 120 Volt power supply tothe appliance. Turn off all manual gas valves connectingthe appliance to the main gas supply line. Remove thefront door of the boiler to gain access to the ignitorassembly. Remove the two wires connected to theassembly. Then remove the two bolts connecting theignitor assembly to the burner door. Remove andreplace the old ignitor assembly gasket. Reinstall a newignitor assembly in the reverse order if the old assemblyis determined defective. Replace gasket if necessary.11.2.5 Flame SensorThe flame sensor is a single rod system. To replacethe flame sensor electrode, shut off the 120 Volt powersupply to the boiler. Turn off all manual gas valvesconnecting the boiler to the main gas supply line.Remove the front door of the boiler to gain access to theflame sensor electrode. Remove the flame sensor wirefrom the electrode. Remove the two bolts fastening theelectrode to the burner doors. Remove and replace theold flame sensor gasket. Reinstall a new flame sensorelectrode in the reverse order if the old electrode isdetermined defective.CautionIgniters and sensors get hot andcan cause burns or injury.Figure 34. Burner Service.