Laars MagnaTherm MGH1600 Installation And Operation Instructions For

Also see for MagnaTherm MGH1600: Installation and operation instructions Installation and operation instructions Installation and operation instructions

Contents

Laars MagnaTherm MGH1600 Installation And Operation Instructions For Manual pdf 103 page image

MagnaTherm Boilers and Water HeatersPage 9912.G 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 48 shows the Control Snapshot screen.Menu 48. 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 49.Menu 49. 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.H Operating SequenceWhen there is a call for heat, the unit will close pumpcontacts to energize the customer supplied relay/contactor to start water flow. Once the LCI circuit(flow switch, gas pressure switches, LWCO, andHigh Limit aquastats) are completed the unit willstart the blower and begin the ignition sequence.The unit 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-ignitiontimer will start to allow the spark to begin. 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 the10 second timer has expired the control will openthe main valve and the Main Flame EstablishingPeriod will begin for a period of 5 seconds. If flameis established within those 5 seconds then unitwill proceed to Run, if flame does not establishthe unit will post-purge to 100% for 30 secondsand the sequence for ignition will begin again. ForNon CSD-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.