Maintenance And Cleaning - Dunkirk 90-50 Installation, Operation & Maintenance Manual

Maintenance as outlined below can be performed by the
owner unless otherwise noted.
The acidic nature of flue gasses condensing on the aluminum boiler
sections will cause the formation of aluminum oxide. This oxide
formation is normal, is generally uniform throughout the boiler
sections, and represents a negligible mass of aluminum that is
consumed by oxidation during the life of the boiler. If left unchecked,
this buildup may eventually cause blockage of the flue gas passages
in the boiler sections, reducing efficiency, and ultimately shutting
down the boiler due to lack of combustion air flow. Regular service
and maintenance by a qualified service agency must be performed to
assure safe trouble free operation and maximum efficiency.
beginning of each Heating season
Annual service call by a qualified service agency, which
1.
includes:
A. Examine flue passages between boiler sections, burner,
and condensate lines, and clean if necessary following
the annual examination and cleaning instructions in para
graph "F" on the next page.
B. Visually inspect venting and air intake system for proper
function, deterioration or leakage. If the vent or air intake
show any signs of deterioration or leakage, repair or replace
them, immediately. Insure proper reassembly and resealing
of the vent and air intake system
C. Check for and remove any obstruction to the flow of
combustion air or venting of flue gases. Check the air baffle
located inside 1½" x 2" flexible coupling on the mixer,
clean it if necessary and make sure to put it back. Refer to
repair parts diagram of mixer and pressure switch assembly
for exact location.
D. Follow instructions for "PLACING BOILER IN
OPERATION".
E. Follow instructions for" CHECK OUT PROCEDURE
AND ADJUSTMENTS".
F. Visually inspect condensate drain line for proper operation
and deterioration. Check for plugged condensate drain
line.
G. Check the silicone rubber seals between boiler sections.
Insure that there are no leaks. Use RTV silicone rubber
adhesive sealant (available in caulking gun tubes) rated for
at least 400° F to replace or repair seals in locations where
original seals have deteriorated.
H. Check all gasketed joints for leakage, and tighten bolts or
replace gaskets if necessary.
I. Remove jacket front and top panels and check for piping
leaks around relief valve and other fittings. Repair, if found.
DO NOT use stop leak compounds.

mainTenanCe and Cleaning

Check that boiler area is free from combustible materials,
2.
gasoline, and other flammable vapors and liquids.
Circulator pump and blower motor furnished with boiler are
3.
permanently lubricated from factory and require no further
lubrication. Additional or non-factory supplied pumps and/
or motors should be lubricated according to the pump and/or
motor manufacturer's instruction.
daily during Heating season
Check for and remove any obstruction to the flow of
1.
combustion air or venting of flue gases.
Check that boiler area is free from combustible materials,
2.
gasoline, and other flammable vapors and liquids.
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