Dunkirk Q90-200 Series II - Manual (Page 49)

49
Annual Shut Down Procedure (End Of Each Heating
Season)
1.
Follow the instructions in “WHAT TO DO IF YOU SMELL
GAS” on page 29.
2.
If heating system is to remain out of service during
freezing weather, and does not contain antifreeze,
drain system completely. If boiler will be exposed
to freezing temperatures, drain condensate lines.
Otherwise, do not drain system or boiler.
Annual Examination And Cleaning Of Boiler
Components
1.
Examine flue passages. Remove blower assembly from
casting. Follow procedure for examining and cleaning
burner is described below.
Any buildup of sediment or aluminum oxide (white powdery
or flaky substance) in flue passages must be cleaned as
follows:
A. Remove jacket front and top panels.
B. Confirm manual gas valve is closed and disconnect
gas line to gas valve at union.
C. Disconnect wires to gas valve and igniter.
D. Remove air inlet assembly from gas valve.
E. Loosen, do not remove five nuts attaching blower
adapter assembly to boiler.
F. Remove two igniter screws. Carefully remove
igniter. Do not touch igniter element with your
fingers or hands as oils or debris will cause
premature failure.
G. Remove five nuts and blower adapter assembly.
Remove burner and gaskets.
H. Aluminum oxide deposits are water soluble and
may be rinsed away with spraying or running
water.
I. Use flexible handle nylon brush to loosen sediment
and aluminum oxide on all exposed heating
surfaces of boiler. Take care brush does not get
stuck in heat exchanger.
J. After brushing and rinsing, remove any remaining
loosened sediment using vacuum with snorkel
attachment.
K. Inspect burner for foreign matter in flame ports
or inside burner. Remove any foreign matter by
blowing with compressed air or vacuuming.
L. Install burner and gaskets. Position blower adapter
assembly over studs. Install five nuts, do not
tighten. Install igniter and igniter gasket and fasten
with two screws. Do not touch igniter element with
your fingers or hands as oils or debris will cause
premature failure. Tighten five nuts holding blower
adapter assembly.
M. Connect gas line to gas valve; air inlet assembly
to gas valve (using 2” x 1½” flexible coupling);
pressure switch hose to gas valve and air inlet
assembly; 2” flexible coupling to boiler exhaust
port; igniter wires; and gas valve wires.
2.
Visually inspect condensate trap. Clean out any visible
foreign material or debris from condensate lines as
described below.
A. Inspect for sediment or blockage.
B. Flush out with water or vacuum.
C. Follow instructions in “Near Boiler Piping” on page
8, for filling condensate trap with water.
3.
Inspect flue connector using following steps.
A. Loosen clamp on draft inducer end of 2” flexible
coupling connecting vent tee to exhaust port.
B. Inspect interior of vent tee. Clean any buildup of
sediment on inside surface.
C. Connect 2” flexible coupling to draft inducer outlet.
16 - MAINTENANCE AND CLEANING
DANGER
Before servicing, turn off electrical power to boiler
at service switch. Close manual gas valve to turn
gas supply OFF to boiler. Failure to comply will result
in death or serious injury.
!
NOTICE
Perform regular service and maintenance by
qualified service agency at least once every 12
months to assure safe, trouble free operation and
maximum efficiency.
NOTICE
Verify proper operation after servicing.
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.
!