Dunkirk DMG-240 Installation, Operation & Maintenance Manual page 64

• Circulator pump and combustion air blower motor furnished
with boiler are permanently lubricated from factory and
require no further lubrication. Lubricate field sourced
pumps and/or motors according to pump and/or motor
manufacturer's instruction.
• Check following components are operating properly and are
free of blockages or obstructions:
• air vent;
• check venturi air inlet for blockage and clean as
required;
• verify pressure test port cap and combustion test port
are in place;
• return temperature sensor clip must be securely seated
on pipe; Check boiler for any sign of leaks.
• Check low water cutoff using user interface (if installed).
• Check operation by pressing test button on low water
cutoff.
• "Low Water" LED should illuminate and burner
should shut down.
• Should get error message on User Interface (E36).
• Every 5 years remove low water cutoff. Reinstall after
cleaning.
• Every 10 years replace low water cutoff.
• See Table 13 page 41 for flame signal rate at 100% firing
rate ( High fire).
• Visual inspection of flame through sight glass. Burner should
be fully illuminated. See figure 11-1.
• Check heating system expansion tank.
11 - GENERAL MAINTENANCE AND CLEANING
11.2 Annual Shut Down Procedure
• Follow instructions "To Turn Off Gas To Appliance" unless
boiler is also used to supply domestic hot water. See
section 10.
• Drain system completely if system does not have antifreeze
when heating system is to remain out of service during
freezing weather.
• Drain condensate lines when boiler is to be exposed to
freezing temperatures.
!
WARNING
Following service procedures must be performed
by qualified service agent. Boiler owner shall not
attempt these steps. Failure to do so could result in
death or serious injury.
11.3 Annual Inspection and Cleaning of Boiler
Components
• Obtain Burner Inspection Kit. Follow heat exchanger
cleaning kit instructions for examination and cleaning.
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P/N 240011656, Rev. E [07/30/2018]