Specifications
MONITOR HEATING SYSTEMS
Section
1:
Description
1-22
FUEL
DEUVERY
SYSTEM
Fuel
Delivery
is a
very
important
aspect
of the
Monitor's
operation.
The
fuel
flow must
be
maintained
at a
level corre-
sponding
to the
burn mode,
so
that
combustion
can
be
conducted efficiently.
Fuel moves
by
gravity-flow
from
the
external fuel
storage
tank
or the
capsule fuel tank
to the
Fuel
Constant Level Valve.
The
Solenoid Pump meters
the
flow
of
fuel from
the
Fuel Constant Level Valve
to the
Burner Pot.
The
metered flow
of
fuel
is
carried
to the
Burner
Pot
by
a
copper fuel
line.
1-23
EXTERNAL
FUEL TANK
Fuel
for the
Monitors
can be
stored
in,
and fed
from
an
external storage
tank.
The
tank,
which generally
is
dealer
installed,
should
contain
a
shutoff
valve,
a
fuel
filter
and a
vent.
Installation
of the
tank should
conform
to
local
regulations
and to the
specifica-
tions
and
guidelines
documented
in
this
Service
Manual.
1-24 FUSIBLE LINK
VALVE
Basically,
the
Fusible Link Valve
is a
safety mecha-
nism that
cuts-off
fuel
to the
heater
in the
event
of
an
overheat
condition
at the
valve.
In
M-2400/M-2200,
Fusible
Link
Valve
is not
instal-
led,
If
necessary,
it can be
installed
outside
of the
appliance.
The
Fusible Link Valve
is a
springloaded
device that
cuts
off the
supply
of
fuel
to the
heater when
the
temperature level
(at the
valve)
exceeds
a
predefined maximum
limit.
An
inlet
on the
bottom
of the
valve
allows
fuel
to
pass
into
the
heater.
The
handle-which
can
also
manually
be
opened
or
closed-sits
on a
spring-
loaded stem which contains
a
low-melting point
alloy.
Fuel
enters
the
Fuel Constant
Level
Valve
through
an
inlet
at the
bottom
of the
reservoir.
As the
level
of
fuel rises,
it
passes through
a
filter (which
removes
most
particles
and
foreign matter
from
the
fuel),
flows
up
through
an
open inlet valve
and
enters
the
tank.
IMPORTANT:
The
Fuel
Constant
Level
Valve
filter
should
be
cleaned
or
replaced peri-
odically.
Time
intervals
will depend
on
purity
and
quality
of
fuel.
Within
the
Valve,
a
float mechanism controls
the
level
of
fuel that will
be
permitted
to the
reservoir.
As
the
fuel level drops,
the
float drops down
to
increase
the
inlet
valve opening
to
admit
more
fuel
into
the
valve.
When
the
fuel level reaches
its
maximum
volume,
the
float
rises
to
shut
the
inlet valve.
In the
event
that
fuel
within
the
reservoir
rises
to an
abnormally high level,
a
float within
the
reservoir
rises
to
trip
a
safety magnet. This safety magnet
locks
out the
float
to
prevent fuel from entering
in the
reservoir.
Should
a
foreign substance cause
the
inlet
valve
to
stick
(or
prevent
it
from opening),
the
Fuel
Set
Lever
is
utilized
to
free
the
valve
and to
admit fuel
to the
reservoir.
A
CAUTION:
Care
must
be
taken
to
prevent
dust,
dirt,
or
other debris from
clogging
or
blocking
the
inlet
valve.
If
debris collects
on the
seat
of the
inlet
valve
it may
cause
tripping
of the
safety
lever
and
will
require cleaning.
1-25
FUEL
CONSTANT
LEVEL
VALVE
This valve
has an
automatic shutoff safety mecha-
nism
and a
Fuel
Set
Lever.
The
safety mechanism
prevents
fuel from flooding
or
overflowing
from
the
fuel
reservoir.
The
Fuel
Set
Lever resets
the
float
so
the
Fuel Constant Level Valve
can
resume opera-
tion.
The
fuel reservoir
is a
tank which contains
a
float
assembly,
a
safety mechanism,
and a
priming lever.