CHAPTER4
STARTING AND OPERATING
INSTRUCfiONS
NOTE: Abnormally high pressure indi-
cated
on
the nozzle air
pr~ure
gauge is an indication that the
burner
nozzle
has
become
clogged.
In
this event, check the
nozzle and clean as
n~ary.
After the air flow has been verified, tum the
burner switch
off
and return the run/test switch
to the run position.
E.
FIRING PREPARATIONS
FORN0.201L
(SERIES 1 00-200)
Prior to initial firing, oil flow and pressure should
be
established and verified. Atomizing air pres-
sure should also be established
as
outlined in
Section D. The schematic flow diagram (Fig.
1-11) indicates the flow
of
fuel and atomizing air.
. If the burner is a combination fuel
mOdel,
make
certain that the main gas shut-off cock
is
closed
and set the gas/oil selector switch to
"oil." Insert
the burner drawer gun . into its most forward
position and latch
it
in
place (see Fig. 4-1).
Oil
Flow-
Open all valves in the oil suction and
oil return lines.
If
the oil supply tank
is
located above the level
of
the pump and flow to the pump
is
by gravity,
then
it
usually will be necessary
to
vent the
suction line to allow oil to fill the line. This
generally can be accomplished
by
cracking a
union fitting, or by opening the cap
of
the oil
strainer using care to prevent spillage
of
oil.
Tighten fitting
or
cap as soon as oil flow appears.
If
the oil supply tank
is
below the level
of
oil
pump, it
is
MANDATORY that the suction line
to the pump must be completely filled with oil
prior to starting the pump
to avoid the possibility
of
damage
to
the pump gears through operation
750-150
without the lubrication afforded
by
the fuel oil.
Non-lubricating fluids such as kerosene should
not
be
used
for priming.
Prior to priming the suction line and the initial
start, check
to make certain that all plugs, con-
nections, etc., have been securely tightened
to
prevent leaks.
If
the fuel oil supply originates from a pres-
surized loop, it
is
assumed that the pressure
of
the
loop will
be
at a minimum
of
75 psi. Boilers
would not then have individual pumps furnished
as
standard equipment Under these conditions,
the relief valve at the terminal block should be
adjusted to the point where it becomes
inopera-
tive.
A standard equipped boiler has a selector switch
incorporated
in
the oil pump motor starter.
Momentarily energize the starter
to check for
proper pump rotation. With the rotation verified,
operate the pump to determine that oil circulation
exists. Observe the oil burner pressure gauge for
·indication that flow
is
established. If no pressure
shows on this
gaug~
after a few moments, stop
the oil
pump· and re-prime. If the supply tank
is
lower than the pump, it is possible that the initial
priming
of
the suction line, followed by opera-
tion
of
the pump, will not eStablish oil flow. This
might be caused
by
obstruction
in
the suction
line, excessive lift, inadequate priming, suction
line leaks, etc.
If the oil flow is not read
i1
y
established, avoid prolonged operation
of
the
pump to minimize risk
of
damage to internal
parts
of
the
pump.lftheoil
flow
is
not established
after a second
or
third priming attempt, a full
investigation
is
required to determine the cause.
A vacuum (or a compound pressure-vacuum)
gauge should be installed at the suction
port
of
the pump and its reading observed and recorded
for future guidance. If a vacuum condition exists,
this reading will reveal the tightness
of
the
sys·
tem. It is advisable
to
maintain the vacuum read-
ing at less than 10" W.C. A vacuum
in
excess
of
this may allow oil to vaporize causing cavitation,
loss
of
prime, and an unstable firing condition.
CHAPTER
4..S
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