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Raytheon Beech Baron E55 - Troubleshooting Heater System (TC-1658 & After;

Raytheon Beech Baron E55
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RayRleon
Aircraft
Company
BARON
55
AND
58
SHOP
MANUAL
CHARTP
I
TROUBLESHOOTING
HEATER
SYSTEM
(TC-1658
AND
AFTER;
TE-959,
TE-968
AND
AFTER;
TH-437
AND
AFTER)
I
PROBLEM
PROBABLE
CAUSE
CORRECTIVE
ACTION
I
1.
Blower
runs
but
heater
will
not
a.
Overtemp
circuit
breaker
tripped.
a.
Check
ductstat
operation;
check
start,
combustion
chamber
and
duels
for
obstructions.
b.
Faulty
ignition
unit
vibrator,
b.
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.
i
d.
If
test
in
(c)
produces
spark.
remove
and
clean
or
replace
spark
plug.
e.
Fuel
solenoid
valve
not
energized.
e.
Check
electrical
connections.
Disconnect
fuel
line
and
check
for
fuel
flow.
Replace
defective
valve.
f.
Fuel
filter
in
fuel
pump
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.
Faulty
ductstat.
a.
Connect
continuity
meter
across
automatically.
ductstat
leads
and
operate
control.
As
the
control
is
pulled
out,
the
ductstat
switch
should
close,
completing
the
circuit.
3.
Heaterbackfires
intermittently.
a.
Loose
connection
in
controlcircuit
i
a.
Check
electrical
connections.
or
loose
ignition
lead
to
spark
plug.
b.
Mixture
too
rich.
b.
Make
checks
in
Item
4.
c.
Restriction
in
combustion
air
duct,
c.
Check
duct
for
obstruction.
Check
combustion
blower
for
proper
operation.
4.
Fuel
mixture
too
rich;
exhaust
a.
Restriction
in
combustion
air
duct.
a.
Check
iris
valve.
Check
ducts
for
smudges
fuselage.
obstruction.
b.
Restriction
in
exhaust
duct.
b.
Check
exhaust
outlet.
c.
Loose
core
in
fuel
nozzle.
c.
Clean
nozzle.
Make
sure
core
is
seated
tightly
in
shell.
E20
SECTION
10
Page
19
Jun
27/03

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