MONITOR
HEATING
SYSTEMS
Section
Servicing
5-1
INTRODUCTlON
Sewicing
is
required when the Monitor Heater is not
running at proper efficiency. This section covers
possible causes and corrective procedures for effi-
ciency loses.
Signs of improper heater efficiency and performance
would
be:
-
Yellowish lazy. flame
-
Smoke from flue
pipe
exhaust
-
Heavy soot and carbon build up in combustion
chamber
-
Lowered heat output.
5-2
MEASUREMENT OF FUEL FLOW
RATE
Fuel flow rates are preset and sealed. These rates
should not and we recommend they do not
be
readjusted.
5-3
REMOVAL OF WATER DEPOSITS AND
CONTAMINANTS FROM FUEL CONSTANT
LEVEL
VALVE AND FUEL
UNES
NOTE:
Disconnect the Monitor from power supply
(unplug) before proceeding.
1.
Use
a
syphon pump and a syringe to drain
off
any fuel in the fuel sump (in case
of
capsule
tank use on the Monitor
422).
2.
If
using separate tank on the Monitor
422
shut
of! fusible link valve. On
the
Monitor
441
shut
off valve of separate tank.
3.
Bend
a
piece
of
sheet metal or cardboard into a
U
shape and place it under the fuel constant
level valve strainer cover to drain bad fuel into
a
1-2
liter pan. (Figure
4-1)
A,
Remove strainer cover and drain.
8,
With strainer cover removed, inspect, clean
and/or replace strainer
if
damaged.
C.
Remove drain
port
screw and drain.
D.
Replace strainer, cover and screw.
E.
Open fusible link valve or shut-off valve to
refill system with fresh crystal clear ker-
osene.
F,
Repeat steps
1-3
until all COntami~ted fuel
is
drained
off.
4.
Remove fuel feed pipe
from
bumer
pot
and
solenoid pump, and drain fuel into pan.
5.
Once lines are clear, reconnect fuel
feed
pipe,
turn operation switch ON
and
start
a
test
run.
NOTE: Remwing and retightening bumer fuel
connection must
be
done when
a
bumer
cools down completely.
If
it
is done when
a
bumer is hot. the welding on the fuel joint
may
break. Fixing Torque for nut30
-40kg
.
crn(26 -351b.in).
54
CLEANING THE BURN CHAMBER
&
BURNER
POT
Under normal running conditions,
soot will not
deposit in great quantities inside the burner, and a
light covering of
soot will not affect the performance
of the unit thus
it.need not
be
cleaned. However,
if
heavy soat built up does occur the unit should
be
opened and cleaned.
The bumer is assembled using gaskets to maintain
its air tightness.
If
these gaskets leak. the extra alr
can cause a serious soot problem and or exhaust
gases to escape into the area being heated.
NOTE:
If any gaskets are tom when commnents
are removed, replace. Disconnect power
supply to unit.
If
cleaning is necessary, use the following method
1.
On
the Monitor
422
A.
Remove lower assembly.
8.
Remove front cover.
C.
Remove top cover and lead wire con-
nectors.
D.
Remove front and top heat shields that
cover
the
bum chamber and their lead
connectors.
E.
Remove fuel piping
from
bum chamber.
F. Remove igniter.
G.
Remove flame detective rod lead from
PCB
(DO
NOT
REMOVE
fROM
BURN CHAMBER).
H. Remove screw at top
of
bumer
cap
which
attached it to cabinet. Remove screw at
back
of
cabinet from exhaust duct and
remove
the
4
screws holding
the
bum
chamber to
base.
I.
Rock chamber back and
forth
lightly, raise
about
1/2'
and remove bum chamber and
heat exchanger,
as
one assembly from unit.
J.
Set chamber upside down and remove
the
4
screws which secure
the
bumer pot to
the
bum chamber. Pull the bumer pot up and
out.
2.
On
the Monitor
441
A.
Remove louver assembly.
8.
Remove
front
cover and wire connecto~.
C.
Remove
top
cover.
D.
Remove heat shield
that
covers combustion
chamber.
E.
Remwe service
panel.
F.
Remove Fbame detector
rod.
For a more thorough cleaning, use
the
same
procedure
as
for
the
W22
above.
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