LAARS MagnaTherm MGV - Installation, Operation and Maintenance Instructions - Manual (Page 89)

MagnaTherm Boilers and Water Heaters Page 85
To use this function, select the parameter you want
to track from the pull-down list. The system will
present a graph that tracks that variable.
To see the graph for the currently-selected function,
press the View button.
Menu 44. Trend Analysis Graph
The time scale can be adjusted by pressing the
Seconds button in the lower left-hand corner.
12.7 Control Snapshot
The software allows you to take a “snapshot” of
the current state of the controller, including setup
information and operating information. This
information can be helpful during troubleshooting.
Menu 45 shows the Control Snapshot screen.
Menu 45. Control Snapshot List Screen
Select one of the controllers listed on the right side
of the screen. Press one of the buttons below the
right column to see the snapshot. See Menu 46.
Menu 46. Typical Control Snapshot
The Show Status button captures the current status
of the I/O of the control only. Show Configuration
captures the current parameter settings and the
control setup. You can save the snapshot, give it a
name, or send a copy to the USB port.
12.8 Operating Sequence
When there is a call for heat, the unit will close
pump contacts to energize the customer supplied
relay/contactor to start water flow. Once the LCI
circuit (flow switch, gas pressure switches, LWCO,
and High Limit aquastats) are completed the unit
will start the blower and begin the ignition sequence.
Magnatherm is equipped with a low and high fire air
pressure switch. The unit will pre-purge at 65% fan
for 30 seconds and prove fan through the blocked
intake switch. Once fan is proven, the blower will
proceed to 24% and the 10 second Pre-ignition timer
will start to allow the HSI to heat up. Once the
Pre-ignition timer has expired the control will open
the Pilot solenoid and the Pilot Flame Establishing
Period (PFEP) will start for 10 seconds to establish
flame. Once flame has been established and the 10
second timer has expired the control will open the
main valve and the Main Flame Establishing Period
will begin for a period of 5 seconds. If flame is
established within those 5 seconds then unit will
proceed to Run, if flame does not establish the unit
will post-purge to 100% for 30 seconds and the
sequence for ignition will begin again. For Non
CSD-1 units retry for ignition is 3 times before
Lockout 109 (Ignition Failure) occurs. For CSD-
1 units there is a single retry before Lockout 109
occurs.