shaft
for
distorted
or
cracked shoulders, Re-
place connector
as
necessary.
Inspect
rubber
coupling
for
visible damage or
deterioration. Replace
if
necessary.
In
spect
heater
burner
blower to
burner
and
exchanger housing flexible hose,
grommet
and
clamp for deterioration
or
other
visible damage.
Replace hose
with
grommet
if
necessary. Re-
place clamp
if
necessary.
NOTE:
The ignition
unit
CL8sentbly
U a sealed
unit and should not
be
disassembled.
If
inspec-
tion or tests indicate the
unit
to
be faulty, re-
place the assembly.
In
spect
heater
case lower half
for
distortion,
broken
'
....
elds
or
other
visible damage. Repair as
necessary.
In
spect
heat
exchanger assembly for broken
seams, broken welds, distortion
or
other
visible
damage.
Repair
or
replace
heat
exchanger
as
necessary.
In
spect louver
plate
and
mixer
assembly
for
loose
rivets
broken ground electrode, distortion,
or
loose bame plate.
Repair
or
replace
as
nec-
essary.
In
spect
burner
and exchanger housing
for
cracks, restricted fuel inlet scree
n,
broken
or
di
sto
rted
spark
plug
gasket
seating
surfaces,
loose
or
missing
heater
blower
air
metering
hole plug,
or
damaged housing
thread
s.
If
in-
spection reveals housing is
not
fit
for
further
servic
e,
replace the assembly.
Check nozzle f
or
restricted
metering
hole,
plugged screen
or
damaged threads.
Blowout
metering
hole
with
a limited amount of
air
pres
-
sure. B
lowout
screen.
Ii
other
visible
dama
ge
is evident, replace
the
nozzle.
In
spect
the
spark
plug and gaskets. Inspect
spark
plug
for
cracked porcelain, broken or ex-
cessively
burnt
electrode. Replace s
park
plug
and
gaskets
if
necessary.
Inspect
spa
rk
plug
cap
for
cracks
or
distor-
tion. Replace
cap
if
necessary.
Inspect
fuel line inlet fitting
for
di
stortion
or
damaged threads. Replace fitting
if
either
of
these conditions exist.
Inspect
fuel valve
co
il
for
loose, broken
ter-
minals or
other
visible damage. Replace coil and
retainer
gas
ket
if
any
of these condit ons e
xist
.
91
Inspect coil
retainer
cover
for
corrosion or
loose
terminal
rivet
s.
Correct
as
necessary.
Inspe
ct
burner
and
exchanger
assembly to
heat
exchanger
clamp assembly for broken
welds, cracks
or
other
visible damage. Replace
clamp assembly if necesary.
Inspect
burner
and
exchanger
assembly to
heat
exchanger
gasket
for
deteriora
tion
or
other
visible damage. Replace
gasket
as
nec-
essary
.
Inspect the
overheat
switch located in
the
upper half of
the
heater
case
for
broken porce-
lain, burned
or
broken wiring, loose
or
broken
contact points,
or
other
visible damage.
If
the
wire
connections
are
loose
at
the
overheat
switch,
correct
by soldering.
If
any of the
other
conditions exist, replace
the
ove
rhe
at
switch as-
sembly by first un
so
ldering
the
one white wire
at
the
capacitor (condenser), disengage both
wi
reo:.
from
under
the
cover clip, then remove
the two
overheat
switch
attaching
screws and
remove the overheat switch assembly with
wires.
If
the
capacitor
(condenser) is
to
be re-
placed,
umolder
the
two wires
at
the
terminal
block in
the
cover and remove
the
capacitor.
Replace
the
damaged
parts
with new ones and
install by
reversing
the
above procedure.
Inspect
the
burner
blower
metering
port
plug
grommet
for
deterioration or other visible dam-
age. Replace
grommet
as
necessary.
TESTING HEATER SYSTEM
AND COMPONENTS
Where
the
heating
system is
not
functioning
properly (insufficient
01'
no hellt)
the
cause will
be found in
either
the
electrical or fuel systems
or
a combination of both system
s.
Simple pro-
cedures
for
isolating
the
causes of
the
trouble
and
the
methods of correcting the
sa
me
are
as
follows:
ELECTRICAL SYSTEM
Turn
the
ignition,
temperature
control
and
the
blower switches to
the
"ON" position. R
efer
to
the
wiring
diagram,
Figure
3;
with
the
aid
of a 12-volt
test
lamp check
the
continuity of
the
electrical
circuit
as
follows: Connect one
lead of
the
test
lamp to a good ground
and
touch
the
remaining lead
at
each of
the
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