Clean Fuel Constant Level Valve Filter; Visual Inspection; Verify Igniter Operation 4-9 Fuel Contamination - Monitor Products, Inc M2400 Service Manual

MONITOR HEATING SYSTEMS
Section 4: Maintenance
4-4 VERIFY IGNITER OPERATION
Visually inspect Igniter Operation
WARNING:
WARNING:
HEATER IS OPERATIONAL DURING THIS INSPEC-
TION. AVOID DIRECT CONTACT WITH ANY
HEATED OR ELECTRICAL COMPONENT.
STEP1: Prepare for Inspection
Remove Front Cover and Louver Assembly.
STEP2: Visual Inspection
A. Turn heater ON.
B. Look (downward) through window on the Com-
bustion Chamber. 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.
STEP3: Reassembly of Heater
Turn the heater OFF and replace the Louver Assem-
bly.
4-5 CLEAN FUEL CONSTANT LEVEL VALVE FIL-
TER
Note: Use a quality fuel filter at the tank to minimize
need for cleaning constant level valve filter, A
water separate type filter works well, and
avoid felt type filter elements.
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 pores.
Whenever a filter is torn or disfigured (enlarged
pores), it should immediately be replaced.
Inspect and clean the filter as indicated by the
procedure below:
Strainer
Strainer spring
Constant Level
Valve
Strainer
Cover
Drain Guide
Container
Constanl Level
Valve Drain Screw
CLOSE SHUT-OFF VALVE OF THE EXTERNAL
FUEL TANK TO AVOID DRAINING ALL FUEL
FROM TANKS.
NOTE: Power should be OFF during the perfor-
mance of this procedure.
STEP1: Disassembly
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.
STEP2: 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 portion of fuel constant level
valve, back out phillips head screw which is
located slightly above and to the left of filter
cover plate. (See Fig4-1)
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.
B. Replace both the rubber gasket and the cover
plate. (Take care to properly align the screw
holes in the gasket and cover plate).
C. Wipe up any spilled fuel.
Figure 4-1 CLEAN FUEL CONSTANT LEVEL VALVE
41