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1. Follow the instructions in "To Turn Off Gas To Ap-
pliance" in Section Xll.
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 exhangeH
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.
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.
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. 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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