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c. Remove
blower
assembly
fl'om
unit.
Remove
screws
securing
blower
to gas
partition
and
slide
assembly
out.
Be
carefld
not
to
teal"
insulation
in
blower
compartment.
d.
Ensure
proper
reassembly
by marking
blower
wheel
and
motor
in
relation
to
blower
housing
before
disassembly.
e. Loosen
setscrew(s)
that
secures
wheel
to motor
shaft,
relnove
screws
that
secure
ii-!otor inoun{
brackets
to
housing,
and
slide
motor
and
motor
mount
out
of
housing.
2. Lubricate
motor
as follows:
a.
Thoroughly
clean
all accumulations
of dirt
or grease
from
motor
housing.
b.
Remove
dust
caps
or plugs
from
oil ports
located
at
each
end
of motor.
c. Use
a good
grade
of SAE
20 nondetergent
motor
oil
and
put
one
teaspoon
(3/,_ oz. or 16 to 25 drops)
in
each
oil port.
d.
Allow
time
for oil to be absorbed
by each
bearing,
then
wipe
excess
oil fl'om
motor
housing.
e. Replace
dust
caps
or plugs
in oil ports.
3. Remove
and
clean
blower
wheel
as follows:
a.
Ensure
proper
reassembly
by
marking
wheel
orientation.
b.
Lift wheel
fl'om
housing.
When
handling
and/or
clean-
ing blower
wheel,
be sure not to disturb
balance
weights
(clips)
on blower
wheel
vanes.
c. Remove
caked-on
dirt
from
wheel
and
housing
with
a brush.
Remove
lint
and/or
dirt
accumulations
from
wheel
and
housing
with
vacuum
cleaner,
using
soft
brush
attachment.
Remove
grease
and
oil with
mild
solvent.
d.
Reassemble
wheel
into
housing.
e. Reassemble
motor
into housing.
Be sure
setscrews
are
tightened
on motor
shaft
fiats
and
not on round
part
of shaft.
f. Reinstall
blower
access
door.
4. Restore
electrical
power,
then
gas
supply
to unit.
Start
unit
and check for proper
blower
rotation
and motor
speeds
during
heating
and
cooling
cycles,
IV. FLUE
GAS PASSAGEWAYS
To inspect
the
flue
collector
box
and
upper
areas
of the
heat
exchanger:
1. Remove
the
combustion
blower
wheel
and
motor
assem
bly according
to directions
in Combustion
Air Blower
sec
tion
on this
page.
2. Remove
tile 3 screws
holding
the
blower
housing
to the
title
collector
box
cover
(see Fig.
24).
3. Remove
the
12 screws
holding
the title collector
box cover
(Fig. 24) to the
heat
exchanger
assembly.
Inspect
the heat
exchangers.
4. Clean
all surfaces
as required
using
the
wire
brush.
FLUE COLLECTOR
BOX
INDUCED
DRAFT
MOTOR
MOUNTING
PLATE
BLOWER
HOUSING
BURNER
RACK
MOUNTING
SCREW
Fig. 24 -- Blower Housing and Flue Collector Box
V. COMBUSTION-AIR
BLOWER
Clean
periodically
to assure
proper
airflow
and
heating
effi-
ciency.
Inspect
blower
wheel
every
fall
and
periodically
dur
ing heating
season.
For the
first heating
season,
inspect
blower
wheel
bimonthly
to determine
proper
cleaning
fl'equency.
To inspect
blower
wheel,
remove
draft
hood
assembly.
Shine
a flashlight
into
opening
to inspect
wheel.
If cleaning
is re
quired,
remove
motor
and
wheel
as follows:
1. Remove
burner
access
panel.
(See
Fig.
25.)
2.
Remove
the
7 screws
that
attach
induced-draft
motor
mounting
plate
to blower
housing.
(See
Fig.
24.)
3.
Slide
the
motor
and
blower
wheel
assembly
out
of the
blower
housing.
(See
Fig.
26.)
Clean
the
blower
wheel.
If additional
cleaning
is required,
continue
with
Steps
4
and
5.
4. To remove
blower,
remove
2 setscrews.
See Fig.
26.
5. To remove
motor,
remove
4 screws
that
hold
blower
hous-
ing to mounting
plate.
Remove
the
motor
cooling
fan by
removing
one setscrew.
Remove
nuts
that
hold
motor
to
mounting
plate.
6. To reinstall,
reverse
the
procedure
outlined
above.
Vl. LIMIT SWITCH
Remove
blower
panel.
Limit
switch
is located
on
the
gas
partition.
VII. BURNER IGNITION
Unit
is equipped
with
a direct
spark
ignition
100%
lockout
system.
Ignition
module
is located
in the control
box.
Module
contains
a selfdiagnostic
LED.
During
servicing,
refer
to la-
bel diagram
for LED
interpretation.
If lockout
occurs,
unit
may
be reset
by either
momentarily
interrupting
power
supply
to unit,
or turning
selector
switch
to OFF
position
at the
thermostat.
--31--
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