Specifications
MONITOR
HEATING
SYSTEMS
Section
4:
Maintenance
4-6
CLEANING
FUSIBLE
LINK
VALVE
INTAKE
(In
case
of the
Fusible
Link
Valve
is
mounted)
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:
.t.
WARNING:
UNPLUG
THE
HEATER.
POWER
TO THE
HEATER
SHOULD
BE OFF
DURING
THE
PERFORMANCE
OF
THIS
PROCEDURE
STEP1:
Close
off
Fuel
Supply
A.
'Shut
off
fuel
at the
Storage
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
fitting
at
rear
of the
heater. Disconnect
the
copper
tubing
which delivers
the
fuel from
the
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.
Avoid
scratching
the
inside
wall
of the
fitting.
With
a
cotton swab, wipe
the
interior area
of the
inlet
fitting.
STEP3:
Reconnect
Fuel
Line
A.
Reconnect
the
copper
tubing
to the
intake
fitting
and
tighten
the hex nut
B.
Turn
ON
fuel
at
Fusible
Link
Valve
and at
storage
tank.
C.
Check
for
leaks.
4-7
CORRECTIVE
MAINTENANCE
The two
procedures below
are
remedies
for
very
generalized types
of
operating
difficulties.
4-8
REPLACEMENT
OF
FUSES
A
short circuit
or
similar
electrical
malfunction
could
cause
the
fuse
to
blow.
Troubleshoot
the
cause
of
the
blown fuse.
Replace
the
fuse
as
follows:
WARNING:
DO
NOT
REPLACE
FUSE
WHILE
POWER
IS ON.
STEP1:
Removal
of
Fuse
A.
Unplug
heater.
Remove
Front
Cover
and
Louver
Assembly.
B.
Remove
the
fuse from
fuseholder
on the
Printed
Circuit Board.
STEP2:
Installation
of New
Fuse
A.
Install
a new
fuse into
the
fuseholder.
The
fuse
must
be a
250-V,
2 amp or a
250-V,
10 amp
type
as
marked
on the
printed circuit board.
Do
not use
oversized fuses.
B.
Replace
the
Louver
Assembly
and the
Front
Cov-
er
and
plug
the
heater
into
the
wall
outlet.
IMPORTANT:
Whenever
the
heater
is
unplugged,
for
more
than
30
minutes,
the mi-
croprocessor
must
be
reprogram-
med
when
power
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
the
fueling system, examine
and
clean
that
unif
s
filter,
as
well
as the
filter
located
in the
Fuel
Con-
stant Level Valve. When
it has
been determined
tha
water
or
some other contaminants have infiltrated
the
fuel,
the
following action must
be
taken:
A
WARNING:
BEFORE
PROCEEDING
FURTHER,
UNPLUG
THE
HEATER.
STEP1:
Remove
Contamination
A.
Shut
OFF the
fuel supply
at the
storage tank
or
at
the
Fusible
Link
Valve.
B.
Drain
off the
contaminants
from
the
fuel
storage
tank.
Fill
with
fresh,
clean
fuel.
STEP2:
Clean
the
Heater
A.
Clean
fuel
cnstant
level
valve
filter
and
filter
cmpartment.
B.
Remove
the
Front
Cover
and
Louver
Assembly
and
Solenoid
Pump
on the
constant
level
valve.
Clean
the
Solenoid
Pump
filter.
STEPS:
Reinstall Cleaned Components
A.
Replace
the
components correctly
and
install
new
gasket
B.
Turn
on the
fuel
at the
storage tank
and at the
fusible
link
valve,
and
apply power
to the
heater.
If
problem
still
exists
and
contaminated
fuel
is
suspected
it can be
checked
by
A.
Shutting
off the
fuel supply
at the
storage tank
and
at the
fusible
link
valve.
B.
Drain
off
fuel
at
constant level valve.
C.
Disconnect
fuel-line
at
back
of
heater
and
hook
up
a
temporary
tank
with
proven
good
fuel.
D.
Test
run
heater
to see if
problem clears
up
with
use
of new
fuel.
42