Nu-Way MOL 3400-410 Installation & Maintenance Manual

Nu-Way MOL 3400-410 Installation & Maintenance Manual Manual pdf 24 page image

FAULT FINDINGIf the Burner Fails to StartMake sure that all the thermostats and switches in the control circuit are in the ‘made’ position and thatthe oil pre-heater ‘excess limit’ thermostat has not tripped. Reset if required. Check that the low oiltemperature thermostat is set correctly for the appropriate fuel.Check that the electricity supply to the burner is ‘live’ and that the control and main circuit fuses are intact.If a fuse is found to be ‘blown’ then the cause should be investigated and rectified before proceedingfurther.On steam boilers, check that the ‘water level interlocks’ are in the ‘made’ position.If the burner is found at lockout (red lockout lamp illuminated)Reset the burner and observe the starting sequence. (make reference to the Sequence Diagram and TimingCharts for the Flame Failure controls on page 27 for further information.Check the fan and oil pump motor overloads and reset if necessary.Check the operation of the air pressure switch. Failure of the switch to operate prevents the oil pump fromstarting.Flame Occurs Followed by Immediate LockoutCheck the PE cell and the air regulator for correct operation. Check that the oil pressures are correct. Ifnecessary, check and clean the pre-heater hot oil filter, ensure that there is sufficient oil in the storage tank,bleed the oil pump in case it is partially air-locked. Check to ensure that all stop/fire valves in the supplyline are fully open. Check residual fuel oil temperature – check the ring main for correct operation inrespect of temperature and pressure.The Burner Starts With The Correct Oil Pressure But No Flame AppearsCheck the ignition system, HT lead connections, electrode gap and the condition of the electrodeinsulators. Check that the nozzle cut-off is functioning and that the air damper cable is not broken ordisconnected (the air regulator will be fully open). It is important to note that continued re-setting ofthe burner should be avoided as this can lead to a dangerous situation.Modulating SystemIf malfunction of the modulating controller RWF 40 is suspected, check that only compatible componentssuch as the range insert and pressure/temperature detector have been used. If problems persist thenreplacement of the unit should be considered.Burner Commissioning SheetThis manual contains a record of the essential information and will have been completed by thecommissioning engineer with individual details of the burner. These details should be verified periodicallyand adjusted if variations are noted. Commissioning details must also be record in the appliance logbook.MOL 3400-4100 Issue 2 10/08 Page 23