MQNlTQR HEATING
SYSTEMS
Section
4:
Maintenance
44
VERIFY
IGNER OPERATION
Visually inspect Igniter Operation
CLOSE
FUSIBLE
UNK
VALVE
ON
M422
OR
CLOSE
SHLJT-OFF VALVE OF THE EXTERNAL
FUEL
TANK
ON
M-441
TO
AVOID DRAINING
AlL
NU,
FROM
HEATER
IS
OPERATIONAL DURING THIS INSPEC- TANKS.
TION. AVOID DIRECT CONTACT
WITH
ANY
HEATED
OR
ELECTRICAL COMPONENT.
STEP1, prepare' for Inspection
Remove Louver Assembly.
STEP2:
Visual Inspection
A.
Turn heater
ON.
5,
Look (downward) through window on the Corn:
bustionchamber. Verity that igniter is glowing.
If igniter does not glow, something is wrong.
Refer to the Troubleshooting Chart
in
Section
6
of this Service Manual to diagnose the problem.
C.
An alternate inspection
is
to feel the igniter
cover after the unit has been in
the
ignition
stage for about
5
minutes. It should
be
warm.
CAUTION:
If
igniter is broken,do not operate the
'ON
/OFF
switch button repeatedly.
STEPS:
Reassembly
of
Heater
Turn the heater
OR
and replace the Louver Assem-
bly.
4-5
CLEAN
NU.
CONSTANT
LEVEL
VALVE
FIL-
TER
Contaminants
are trapped by
the
filter
to
prevent
them
from clogging the Fuel Constant Level Valve.
The filter, itself has a great number of small pares.
Whenever a filter is tom or disfigured (enlarged
pores), it should immediately
be
replaced.
Inspect and clean the filter
as
indicated by the
procedure below:
NOTE: Power should
be
OR
during the
perfor-
mance
of
this procedure.
STEW:
Disassernbiy
A.
Using a phillips head screwdriver, unscrew the
screws holding the rounded diamond-shaped
cover plate at the bottom of the Fuel Constant
Level Valve. Remove the cover plate.
NOTE: Position a six inch
U
shaped piece of metal
or cardboard under strainer cover to drain
fuel into
a
pan.
B.
Carefully remove the rubber gasket which is
located behind the cover plate.
STEPP:
Inspection and Cleaning
A.
Pull the filter straight out of the fuel reservoir.
B,
If the filter
is
dirty (but undamaged), rinse the
filter in fresh, clean kerosene to remove all
particles. Replace damaged filters.
C.
To drain
off
upper mion
of
fuel constant level
valve, back out phillips head screw which is
located slightly above and to
the
left
of
filter
cover plate.
(See
Fig411
D.
If
upper portion drain is
dirty
or containing
water. then remove pump and inspect and
clean
its
screen.
STEPS:
Reassembly
A,
Push the (new or cleaned) filter back into the
bottom of the
fuel
reservoir.
8,
Replace
both
the,rubber gasket and the cover
plate.
flake .care
to
properly align the screw
holes in
the
gasket and cwer plate).
C.
Wipe up any spilled fuel.
I
DNn
Gudc
Carm~ner
!
Dram
Guide
&tnlner
I
M-441
M-422
Figure
64
CLEAN
FUEL
CONSTANT
mEL
VALVE
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