Nu-Way MDFL 3300 Installation And Maintenance Manual

Nu-Way MDFL 3300 Installation And Maintenance Manual Manual pdf 36 page image

Modulating Control : Siemens RWF 40Basic displayThe diagram below shows the RWF40 after switching on the supply voltage. This conditions is calledthe basic display. The actual valve and the currently active set-pint are shown here. Manualoperation, self-optimisation, the operating parameter and configuration levels can be activated fromhere.To change the working set pointThe operating display shows the actual pressure/temperature of the boiler in red and the required setpoint pressure/temperature beneath in smaller green digits. One quick press of the PGM button, thedisplay changes to show the set point as the larger red digits and the SPI in the lower small greendigits.Alter the red display using the up/down buttons to show the new required set point, press exit or letthe unit time out to return to the basic display which should be the new set point figure.To enter a new parameterThe parameters dictate the way in which the burner firing rate alters in response to changes in thepressure/temperature of the boiler.A major factor that determines the need to change the parameters is if the burner is fitted to a steamor hot water boiler. The table below indicates the parameter and its setting for steam and hot waterboilers. It must be emphasised that it is only an indication and any departure from these settingsshould be made in small increments, with time given to see how the burner is reacting to the changedparameter.Press and hold the PGM button down until the green set point figure changes to an AL, the largerupper figures show the value. Use the up/down buttons to set the new values, press the PGM buttonto enter the value and change to the next screen. To cancel an entry press exit. Scroll through thescreens, (PGM button) modifying any value found to be in error (up/down buttons). At the last screenthe PGM button will return the controller to the original display.At any point in the procedure the original operating display can be obtained by letting the unit time out,the value in the display at the time out will be accepted.A value can only be altered within the permitted range of that parameter. All other parameters mustremain as supplied.Note: The detector range parameters SCL & SCH are given as °C for Hot Water (temperature) andbar for Steam (pressure).MDFL 3300 & MDFL 4000 Issue 2 08/08 Page 35K6PGM EXITSIEMENSLandis & Staefa RWF40Burner enableReduce outputIncrease outputManual operationLimit comparatorIncrease valueExit keyProcess value display (red)Setpoint display value (green)Reduce valuePGM keyRWF Recommended SettingsParameter Display HotWater SteamProportionalband Pb1 10 1Derivativetime Dt 10 5Reset time Rt 50 20Actuator time TtSet to the air Damperrunning time betweenlow and high flameSwitch onthreshold Hys 1 0 0Upper offthreshold Hyst 3 99.9 999.9Detector:range start SCL 0 0Detector:range end SCH 100 25