Dunkirk DMG-240 Installation, Operation & Maintenance Manual page 65

!
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.
!
WARNING
Combustion chamber insulation in this product
contains ceramic fiber material. Ceramic fibers
can be converted to cristobalite in very high
temperature applications. The International Agency
for Research on Cancer (IARC) has concluded,
Crystalline silica inhaled in the form of quartz
or cristobalite from occupational sources is
carcinogenic to humans (Group1). Avoid breathing
dust and contact with skin and eyes. Use NIOSH
certified dust respirator (N95). This type of
respirator is based on the OSHA requirements
for cristobalite at the time this document was
written. Other types of respirators may be
needed depending on the job site conditions.
Current NIOSH recommendations can be found
on the NIOSH website http://www.cdc.gov/niosh/
homepage.html. NIOSH approved respirators,
manufacturers, and phone numbers are also listed
on this website. Wear long-sleeved, loose fitting
clothing, gloves, and eye protection. Apply enough
water to the combustion chamber lining to prevent
dust. Wash potentially contaminated clothes
separately from other clothing. Rinse clothes
washer thoroughly.
NIOSH stated First Aid. Eye: Irrigate immediately.
Breathing: Fresh air.
!
CAUTION
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation. Failure to follow these
instructions could result in minor or moderate
injury.
11 - GENERAL MAINTENANCE AND CLEANING
11.4 Maintenance And Routine Servicing
Check and service boiler as necessary.
Frequency of servicing will depend upon installation conditions
and usage, manufacturer recommends annually.
• Check flue termination outside verify it is not blocked.
• Operate boiler and verify operation of its controls and
meets acceptable parameters.
• Ensure all system connections and fittings are tight and
not leaking. Redo any joints and check the tightness of
any fittings that may be leaking.
• Verify safety relief valve is in working order following its
manufacturer's instructions.
To ensure boiler is operating at peak efficiency perform the
following inspection:
• check appearance and tightness of gas and combustion
circuit gaskets
• check condition and position of ignition/flame sensing
electrode
• check condition of burner and ensure it's secure to
aluminum flange
• check for any dirt in combustion chamber. Use nylon
brush with white vinegar and water to clean combustion
chamber.
• heat exchanger cleaning kit is available see parts book
for details
• check gas valve is calibrated correctly
• check there is no dirt in condensate trap
• check the central heating system pressure
• check on expansion tank pressure
• check vent system and clean it if necessary
Record details and maintain service history.
11.5 Component Replacement And Cleaning
1.
Remove any deposits from heat exchanger using suitable
soft brush. Do not use brush with metallic bristles.
2.
Check condition of the combustion chamber insulation
panels. Any damaged panels must be replaced.
3.
Check condition of burner injector on the manifold,
carefully clean it with a soft brush if necessary. Do not
use a brush with metallic bristles this might damage the
injector.
4.
Remove any fallen deposits from bottom of inner case.
5.
Clean burner with soft brush and check flame ports are
clear. Blockages may be removed with stiffer brush.
6.
Check condition of electrodes.
7.
Check spark gap, positioning and height of electrodes.
8.
Check fan impeller is clean and free to rotate.
65
P/N 240011656, Rev. E [07/30/2018]