Laars MagnaTherm MGH1600, Инструкции по установке и эксплуатации для

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MagnaTherm Boilers and Water Heaters
Page 99
12.G 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 48 shows the Control Snapshot screen.
Menu 48. 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 49.
Menu 49. 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.H 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.
The unit 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 spark to begin. 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.