CHAPTER 7
Tum
the burner switch off. Reset the safety
switch. Reopen the gas pilot shutoff cock and
re-establish main fuel supply.
Checking Failure
to
Light Main
Flame
Leave the gas pilot shutoff cock open
..
Shut
off
the main burner fuel supply.
Tum
the burner
switch on. The pilot will light upon completion
of
the pre-purge period. The main fuel valve(s)
will
be energized, but there should
be
no main
flame.
The fuel valve(s) will be de-energized within 4
seconds after the main burner ignition trial ends.
The control will lock
out
on a safety shutdown.
The flame failure light (and optional alarm) will
be
activated. The blower motor will run through
the post-purge and stop.
Tum
the burner switch off. Reset the safety
switch.
Re-establish main fuel supply.
Checking Loss of Flame
With the burner
in
normal operation, shut
off
the
main burner fuel supply to extinguish main
flame.
The fuel valve(s) will be de-energized and the
relay will signal
this condition within 4 seconds.
The control will then lock out on a safety
shut-
down.
The
flame failure light (and optional
alarm) will be activated. The blower motor will
run through the post-purge and stop.
Tum
the burner switch off. Reset the safety
switch.
Re-establish main fuel supply.
G.
OIL
BURNER
l\t1AINTENANCE
The burner should be inspected for evidence
of
damage due to improperly adjusted combustion.
Any soot buidup on the diffuser or the oil nozzle
should
be
removed. The setting
of
the oil nozzle
750-150
INSPECTION AND MAINTENANCE
in
relation
to
the diffuser and other components
is imponant for proper firing and should be
checked.
See
Section
Tin
Chapter 5.
NOTE:
WHEN
INSTAWNG,
THS
HOLE MUST BE LO.
CATEO
AT
BOTTOM
OF
NOZZLE
BOOY.
NOZZLE
TIP
\
0~
~
.
)wiRLER
\
SWIRLER
SPRING
NOZZLE
BODY
[FIGURE 7-3 I EXPLODED VIEW OF
STANOARD BURNER NOZZLE]
Oil Strainers
Oil
strainers should
be
cleaned frequently
to
maintain a free
and.
full flow
of
fuel.
Light Oil Strainers
The fuel oil strainer screen must be removed and
cleaned at regular intervals. It
is
advisable
to
remove this screen each month and clean
it
thoroughly by immersing
in
solvent and blowing
it
dry with compressed air. To remove, loosen the
cover cap screw being careful not to lose the
copper gasket.
If
necessary, tap the strainer cover
gently
to loosen. Check the cover gasket for
damage and replace
if
necessary. Slip pliers into
the cross on the top
of
the strainer and twist
counter-clockwise to remove the
basket
Reas-
semble in reverse order.
Heavy Oil Strainers
Keep the cartridge
of
the oil strainer clear by
regularly giving the exterior handle one complete
tum
in
either direction. Do this often until ex-
perience indicates the cleaning frequency neces-
sary to maintain optimum conditions
of
flow.
If
the
handle
turns
liard,
through
occasional
CHAPTER 7-7.
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