MONITOR
HEATING
SYSTEMS
Section
4:
Maintenance
4-6
CLEANING NSIBLE
UNK
VALVE
INTAKE
FIS-
TING
ON
M422
At periodic intervals, the fitting on the Fusible Link
Valve should
be
cleaned to prevent any accumula-
tion of foreign materials from clogging the inlet. This
is accomplished as follows:
UNPLUG
THE
HEATER. POWER TO THE HEATER
SHOULD
BE
OFF DURING THE PERFORMANCE OF
THIS PROCEDURE.
STEP(: Close off Fuel Supply
A. Shut off fuel at the Storage Tank or remove fuel
from the fuel sump tank with siphon and
syrlnge
if using the capsule fuel tank.
B.
Manually turn handle to close Fusible Link
Valve.
NOTE: Place paper towels
underneath the Fusible
Link Valve to catch any spilled fuel.
STEP2:
Clean Valve
A.
Loosen hex nut on Fusible Link Valve inlet
fittlng at rear of me heater. Disconnect the
copper
tub~ng which delivers the fuel from the
STEPP: Installation
of
New
Fuse
A,
Install a new fuse into the fuseholder. The fuse
must
be
a
2WV,
2
amp or
a
250-V,
10
amp
type
as marked on the printed circuit
board.
Do
not
use
oversized fuses.
8.
Reptace the Front Cover and the Louver
Assembly and
plug the heater into the wall
outlet.
IMPORTRNT: Whenever the heater is unplugged,
the.
Microprocessor must
be
repro.
srammed when Dower is restored.
-
4-9
FUEL CONTAMINATION
Fuel, contamination is
often difficult to diagnose,
even though it will adversely affect heater operation
and performance. The best course of action to take
when fuel contamination is suspected is to examine
all of the system's fuel filters, beginning with the fuel
storage tank.
If
a Monitor Kerosene Lifter is part of
me fueling system, examine and clean that unit's
filter, as well as
the filter located in the Fuel Con-
stant Level Valve. When
it
has been determined that
water or some other contaminants have infiltrated
the
fuel,
the
following action must
be
taken:
storage or the fuel sump tank.
B.
Using
a
small, straight piece
of
wire carefully
and slowly ream-out the inlet fitting on the
Fusible Link Valve.
BEFORE
PROCEEDING FURTHER, UNPLUG THE
Avoid scratching the inside wall of the fitting.
HEATER
With a cotton swab, wipe the interior area of the
STEPI:
Remove
Contarninetion
inlet fitting.
A, Shut
Off
the fuel supply at the storage tank or
at the Fusible Link
Valve.
STEP3: Reconnect
Fuel
Line
B.
Drain off the
contaminants
from
the
fuel storage
A.
Reconnect the copper tub~ng to the intake
tank or
the
fuel sump tank(M-422).
Fill
with
fitting and tlghten the hex nut.
fresh,
clean fuel.
B.
Turn
ON
fuel at Fusible Link Valve and
at
SIEP2:
Clsan
the
storage tank or fuel sump tank.
A. Clean fuel constant level valve filter and filter
C.
Check for leaks.
compartment.
4-7
CORRECTIVE MAINTENANCE
B.
Remove the Louver Assembly and Solenold
The two procedures below are remed~es for very Bump on the constant level valve. Clean the
generalized types of operating
difficult~es. Solenoid Pump filter.
4-8
REPLACEMEM
OF
NSES
SIEP3:
Reinstall Cleaned Components
A
short circuit or s~milar
electrical
malfunction
could
A.
Rep1ace
the
cmmnts
coKect'y
and
lnstall
cause the fuse to blow. Troubleshoot the
cause
of
new gasket.
the blown fuse.
B.
Turn on the fuel at the storage tank and at the
fusible
llnk valve, and apply power to the heater.
Replace the
fuse
as
follows:
If problem still
exists and contammated fuel
IS
suspected
it
can be checked by
A. Shutting off the fuel supply at the storage tank
DO
NOT
REPUCE NSE
WHILE
POWER
8
ON.
and at the fusible llnk valve.
B.
Drain
off
fuel at constant level valve.
STEP(: Removal of
Fuse
C. Dcconnect fuel ltne at back of heater and hook
A.
Unplug heater. Remove LOWer Assembly and
up a
5
gallon qu~ck tank w~th woven good fuel.
Front Cover.
D.
Test run heater to
see
if problem clears
up
wrth
8.
Remove the fuse from fuseholder on
the
Printed
use of new fuel.
Circuit Board.
38
-qQ+++
I
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