2
1
Mu
c
h
soot
a
cc
umu
l
ated
inside
the
boi
l
er
wi
ll
redu
c
e
the
l
ife
and
e
ffic
ien
c
y.
At
l
east
on
c
e
a
year,
cl
ean
the
boi
l
er
inside.
Cleaning
the
boiler
In
c
ase
that
the
oi
l
fi
l
ter
gets
dirty,
stop
operating,
l
o
c
k
the
oi
l
va
l
ve,
and
remove
dust
or
rust
a
cc
umu
l
ated
be
l
ow
the
oi
l c
up.
Deta
c
h
the
oi
l c
up
by
rotating
right
and
l
eft.
Pu
ll
down
the
fi
l
ter.
Cleaning
the
oil
filter
Wash
the
fi
l
ter
and
the
inside
of
the
oi
l c
up
with
cl
ean
heating
oi
l
(
l
ight
oi
l
)
Water
may
get
mired
in
during
feeding
oi
l
or
get
a
cc
usmu
l
ated
natura
ll
y
during
the
l
ong
period
in
the
oi
l
tank.
In
this
c
ase,
drain
water
off
through
the
drain
p
l
ug
in
the
oi
l
tank,
and
when
oi
l
starts
to
get
out,
l
o
c
k
it.
Cleaning
the
oil
tank
Summary of Contents for KDB-203 STC
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