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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 O f f 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 N S E S
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
I S
suspected it can be checked by
A. Shutting off the fuel supply at the storage tank
DO NOT REPUCE N S E WHILE
POWER
8 ON.
and at the fusible llnk valve.
B. Drain
o f f
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 ~ t h 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
- q Q + + +
I
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