5.2 Servicing Procedure - Major Component Parts
Flue
A visual inspection
should
be carried
out
to
ensure
that the flue remains adequately
supported,
both
internally as well as externally,
and
that the
various
joints are effectively sealed. Inspection
covers,
where
fitted,
should
be
removed
and
the flue checked to see
whether
cleaning is required.
If
inspection
covers
are
not
fitted
the
gas
exit
duct
and
flue
spigot
will
provide
not
only
an
indication of the cleanliness of the flue,
but
will also enable access for cleaning. The presence of the
flue terminal
should
be checked.
If
a condensate
trap
and
drain
facility is fitted this
should
be checked to ensure that it continues
to function correctly,
and
the
drainage
of condensates is
not
impaired.
Main Fan Motor
Remove access panel.
Dust
and
other
foreign
matter
should
be
cleaned
by
blowing
over
with
compressed air
and
through
the use of a soft bristle
brush
and
cloth. Solvent wipes
may
be
used
to
remove
heavy
soiling from
the
motor
casing. Traces
of
surplus
lubricants
spreading
from
the
bearings
should
also be cleaned away. Where motors are fitted
with
grease nipples bearings
should
be lubricatd
with
the correct
grade
of lubricant. Motors
which
do
not
have grease nipples feature
sealed bearings
which
are lubricated
during
manufacture
for their life.
The electrical connections
should
be checked as follows. The cover to the terminal box
should
be
removed
by
undoing
the
screws
which
secure
it.
Check
connections
for signs of corrosion,
tightness,
and
ensure
that
there
are
no
stray
strands
which
could
form a
short
circuit.
Clean,
tighten,
and
replace as necessary. Replace cover
and
secure.
Main Fan
Remove
dust
and
other
foreign
matter
by
blowing
off
with
compressed air
or
through
the
use
of
a soft bristle brush. Check
that
the
bearings
do
not
show
signs of excessive wear.
It
should
be
noted
that
these
bearings
do
not
require
lubricating.
If
the
bearings
require
replacing
the
following
procedure
should
be followed.
(a) Remove belt(s).
(b) Loosen set screw
on
eccentric collar
and
tap
the collar in the
opposite
direction to fan rotation.
(c)
Remove collar
and
bearing.
(d) Check shaft for alignment
and
straightness.
(e)
Locate the
bearing
in its seat
and
place
on
the shaft
with
the
cam
facing outwards.
(f)
Fit the eccentric collar
and
engage the cams.
(g) Tighten initially by rotating,
and
then by
tapping
in the direction of the fan rotation.
(h) Replace fasteners
and
secure.
(i) Turn
by
hand
to ensure free fan rotation.
Pulleys
Check pulleys for alignment using a straight edge,
if
necessary reposition either
or
both
of the
pulleys
and
the fan motor. Check for excessive
wear
within
the
root
and
sides of the grooves,
and
check for
any
other
signs of
wear
or
damage,
if necessary replace the pulley as follows.
(a) Release tension
on
belts
and
remove.
(b) Release the
taper
locks
by
slackening the securing screws by several complete turns.
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