Raytheon Beech Baron E55 - Page 448

Raytheon
Airrraff
Company
BARON
55
AND
58
SHOP
MANUAL
CHART1
TROUBLESHOOTING
HEATER
SYSTEM
(TC-1
THRU
TC-1657;
TE-I THRU
TE-967,
EXCEPT
TE-959;
TH-1
THRU
TH-436)
I
PROBLEM
PROBABLE
CAUSE
CORRECTIVE
ACTION
i.
Blower
runs
but
heater
will
not
a.
Blown
fuse.
a.
Check
ductstat
operation;
check
start.
combustion chamber
and
ducts
for
obstructions.
b.
Faulty
ignition
unit
vibrator,
b. Switch
to
reserve
vibrator
contacts.
If
this
corrects
trouble,
replace
vibrator
at
first
opportunity.
c.
Faulty
ignition
unit coil.
c.
Remove lead
from
spark
plug
and
hold
so
spark
may
jump
to
structure.
If
no
spark,
repair
or
replace
ignition
unit.
d.
Faulty
spark plug.
d.
If
test
in
(c) produces
spark,
remove
and
clean
or
replace
spark
plug.
e.
Fuel solenoid
valve
not
energized.
I
e.
Check
electrical
connections.
Disconnect fuel
line
and check
for
fuel
flow.
Replace
defective
valve.
f. Fuel
filter
clogged.
f.
Clean
filter.
g.
Spray
nozzle
clogged.
g.
Clean
spray
nozzle.
h.
Insufficient
combustion
air,
h. Remove
obstructions or
repair
leaks.
Check
for combustion
blower
operation.
i.
Faulty
differential
pressure
switch.
i.
With heater
ON,
check
terminals
to
ascertain
if
switch
is
open.
2.
Heater
will
not
shut
off
a.
Defective ductstat. a.
Connect
continuity
meter
across
automatically,
ductstat
leads
and
operate
control.
As
the control is
pulled
out,
ductstat
switch
should
close,
completing
the
circuit.
3.
Heaterbackfires
intermittently.
a.
Loose
connection in
control
circuit
a.
Check
electrical connections.
or
loose
ignition
lead
to
spark plug.
b.
Mixture
too
rich.
b. Make checks
in
item
4
below.
c.
Restriction
in
combustion
air duct.
c.
Check
duct
for
obstruction,
and
combustion
blower for
proper
operation.
4.
Fuel
mixture
too
rich;
exhaust
a.
Restriction
in combustion
air
duct,
a.
Check
ducts
for
obstructions
and
smudges
fuselage,
combustion
blower for
proper
operation.
b.
Restriction
in
exhaust
duct, b.
Check
exhaust outlet.
Jun
27/03Page
10
SECTION
10
E20