CHAPTER4
STARTING
AND
OPERATING INSTRUCfiONS
!WARNING
Do
not
re-light the
pilot
or
attempt
to
start the main burner, either oil
or
gas, If the
combustion
cham-
ber Is
hot
and/or If gas
or
oil
vapor
combustion gases are present In
the furnance
or
flue passages.
Fallur
to
heed
this
warning could
result In
serious personal Injury
or
death.
CAUTION!
The
burner
and
control
system
are
designed
to
provide
a
"pre-
purge"
period
of
fan
operation
prior
to
establishing
ignition
spark
and
pilot
flame. Do
not
attempt
to
alter
the
system
or
take
any
action
that
might
cir-
cumvent
this
feature
thus
caus-
ing
damage
to
the
equipment.
After main flame ignition, the burner should be
left on manual control at its low fire setting (that
is,
with manual flame control at "close") until the
boiler is properly warmed. Close the steam
header.
·
In
the case
of
a steam boiler, CLOSE
THE
TEST VALVE when steam begins to appear.
A hot water boiler must have a continuous flow
of
system water through the vessel during the
wann·up period. The entire water content
of
the
system and boiler must
be warmed prior to
in-
creasing fuel input.
If
the flame at low fire provides insufficient heat
to reach normal operating pressure or tempera-
ture after 30 minutes, w-adually
increa.Se
the
firing rate
by
turning the manual flame control
in
one point increments
to
no
higher than the third
cam screw.
Operate at this increased fuel input
rate for a period
of
time until an increase
is
noted
in
pressure or temperature.
CHAPTER 4-10
After the boiler is thoroughly warmed, tum the
manual flame control
to high fue. At this point,
a combustion analysis should be made with
in-
struments, and the fuel flow regulated as re-
quired.
Refer
to
adjustment
procedures
in
Cbapter
5.
After making the high-fire adjust-
ment, manually decrease the firing rate, stopping
at each
cam
screw
to
analyze combustion gases
and adjust
as
required.
To properly perform this testing and adjusting,
it
is
necessary that the burner be allowed to fire at
each rate sufficiently long enough
to
achieve a
stable condition.
Operating - Normal operation
of
the burner
should be with the switch in the automatic
posi-
tion and under the direction
of
the modulating
control. The manual position is provided for
initial adjustment
of
the burner over the entire
firing range. When a shutdown
occurs while
operating in the manual position at other than low
fire, the damper will not
be in a closed position,
thus allowing
more air . than desired
to
flow
through the boiler. The hot flame to cool air
cycling subjects the pressure vessel metal and
refractory to
undesi~ble
conditions.
With the switch set at
"auto," the burner will
operate on a modulating basis according to the
load de.mand.
The burner will continue to operate with modu-
lated firing until operating limit pressure
or
temperature is reached, unless:
(1) The burner is manually turned "off."
(2) A low water condition
is
detected
by
the low water level control.
(3) The current or fuel supply
is
inter-
rupted.
(4) Combustion
or
atomizing air pressure
drops below the minimum level.
750-150
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