UTICA BOILERS UB90 125 Installation Manual And Operating Instructions page 27

ANNUAL SHUT DOWN PROCEDURE
(END OF EACH HEATING SEASON)
1. Follow the instructions in "To Turn Off Gas To Ap-
pliance" in Section XII.
2. If heating system is to remain out of service dur-
ing freezing weather, and does not contain antifreeze,
drain system completely. If boiler will be exposed to
freezing temperatures, drain condensate lines. Oth-
erwise, do not drain system or boiler.
ANNUAL EXAMINATION AND CLEANING
OF BOILER COMPONENTS
The following service procedures must be per-
formed only by a qualified service agency. Boil-
er owner should not attempt these procedures.
1. Before servicing, turn off electrical power to boil-
er at service switch. Close manual gas valve to turn
off gas supply to boiler.
2. Examine flue passages by removing blower as-
sembly from casting as shown in the separately
provided "Repair Parts Manual." The procedure for
examining and cleaning the burner is described be-
low.
Any buildup of sediment or aluminum oxide (white
powdery or flaky substance) in the flue passages
must be cleaned as follows:
a. Remove jacket front and top panels.
b. Confirm that 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 but do not remove five nuts attaching
blower adapter assembly to boiler.
f. Remove two igniter screws and very carefully
remove the igniter. The igniter element is very
sensitive. Do not touch the igniter element
with your fingers or hands as oils or debris
will cause premature failure.
g. Remove five nuts and blower adapter assem-
bly. Remove burner and gaskets.
h. Aluminum oxide deposits are water soluble
and may be rinsed away with spraying or run-
ning water.
i. Use a flexible handle nylon brush to loosen
sediment and aluminum oxide on all exposed
heating surfaces of boiler (see "Repair Parts
Manual" for diagram). Be sure that brush does
not get stuck in heat exhanger!
j. After brushing and rinsing, remove any remain-
ing loosened sediment using a shop vacuum
with a snorkel attachment.
k. Inspect burner for any foreign matter in the
flame ports or inside the burner. Any foreign
matter should be removed by blowing with com-
pressed air or vacuuming.
l. Reinstall burner and gaskets and position
blower adapter assembly over studs. Install five
nuts but do not tighten. Reinstall igniter and ig-
niter gasket and fasten with two screws. The ig-
niter element is very sensitive. Do not touch
the 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 as-
sembly to gas valve (using 2" x 1½" flexible cou-
pling); pressure switch hose to gas valve and
air inlet assembly; 2" flexible coupling to boiler
exhaust port; igniter wires; and gas valve wires.
3. Visually inspect the condensate trap. Refer to re-
pair parts diagrams. Any foreign material or debris
that is visible in the condensate lines needs to be
cleaned out as described below.
a. Inspect for sediment or blockage.
b. Flush out with water or vacuum.
c. Follow the instructions under "Near Boiler Pip-
ing" in Section XII for filling condensate trap with
water.
4. Inspection of the flue connector requires the fol-
lowing steps. Refer to the "Repair Parts Manual"
for diagram.
a. Loosen clamp on draft inducer end of 2" flex-
ible coupling that connects vent tee to exhaust
port.
b. Inspect interior of vent tee. Any buildup of sed-
iment on the inside surface must be cleaned.
c. Reconnect the 2" flexible coupling to the draft
inducer outlet.
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