Laars MAGNATHERM MGH2000 Installation And Operation Instructions For

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Laars MAGNATHERM MGH2000 Installation And Operation Instructions For Manual pdf 89 page image

MagnaTherm Boilers and Water HeatersPage 85To use this function, select the parameter you wantto track from the pull-down list. The system willpresent a graph that tracks that variable.To see the graph for the currently-selected function,press the View button.menu 42. trend analysis GraphThe time scale can be adjusted by pressing theSeconds button in the lower left-hand corner.12.7 Control SnapshotThe software allows you to take a “snapshot” ofthe current state of the controller, including setupinformation and operating information. Thisinformation can be helpful during troubleshooting.Menu 43 shows the control Snapshot screen.menu 43. Control Snapshot list ScreenSelect one of the controllers listed on the right sideof the screen. Press one of the buttons below theright column to see the snapshot. See Menu 44.menu 44. typical Control SnapshotThe Show Status button captures the current statusof the I/O of the control only. Show Configurationcaptures the current parameter settings and thecontrol setup. you can save the snapshot, give it aname, or send a copy to the USB port.12.8 operating Sequencewhen there is a call for heat, the unit will closepump contacts to energize the customer suppliedrelay/contactor to start water flow. Once the LCIcircuit (flow switch, gas pressure switches, LWCO,and High Limit aquastats) are completed the unitwill start the blower and begin the ignition sequence.Magnatherm is equipped with a low and high fire airpressure switch. The unit will pre-purge at 65% fanfor 30 seconds and prove fan through the blockedintake switch. Once fan is proven, the blower willproceed to 24% and the 10 second Pre-ignition timerwill start to allow the HSi to heat up. Once thePre-ignition timer has expired the control will openthe Pilot solenoid and the Pilot Flame EstablishingPeriod (PFEP) will start for 10 seconds to establishflame. Once flame has been established and the 10second timer has expired the control will open themain valve and the Main Flame Establishing Periodwill begin for a period of 5 seconds. If flame isestablished within those 5 seconds then unit willproceed to Run, if flame does not establish the unitwill post-purge to 100% for 30 seconds and thesequence for ignition will begin again. For noncSD-1 units retry for ignition is 3 times beforeLockout 109 (ignition Failure) occurs. For cSD-1 units there is a single retry before Lockout 109occurs.