CHAPTER4
STARTING AND OPERATING INSTRUCfiONS
Oil
Pressure-
Oil
supply pressure is regulated
by
adjusting
the
pressure relief valve
at
the
oil
terminal block (Fig. 1-1). A pressure gauge
should
be
installed
in
the terminal block
and
the
relief valve adjusted
to
obtain a minimum read·
ing
of
75
psi when
the
burner is flring
at
maxi-
mum
rate.
When
oil
is
supplied
from
a pressurized loop to
a multiple boiler installation,
the
relief valve
in
the
loop should
be
properly adjusted to provide
this
reading.
In
this circumstance,
the
relief valve
at
the terminal block should be adjusted to
the
point where
it
will
be
inoperative (or removed
and
openings plugged).
To
render the valve in-
operative, tum
the
adjusting screw
in
as
far
as
possible. ·
Adjustment
may
also be required
to
the regulator
on
the
fuel
oil
controller (Fig. 1-5). This pressure
regulating valve
is
equipped with tubing
that
directs
and
adds atomizing air pressure to
the
adjustable spring pressure. Since the atomizing
air pump
is
not running
at
this
time, only tentative
adjustment can
be made. Without this air supply,
adjust the
fuel
oil pressure regulator so
that
the
oil
burner gauge registers approximately
35
psi.
The pressure will
be
higher when
the
flame
is
present,
and
will increase
as
the
firing rate in-
creases. After the burner
is
firing
and
when
the
air
pump
is
running, final adjustment can be
made
at
the
fuel
oil
controller.
Final regulation
of
the oil
flow
to
the
nozzle can
be
done later, if necessary,
by
adjusting
the
metering
cam
screws
as
outlined
in
Chapter
5.
Suggested oil pressures
at
high fire operation:
Oil
Supply
at
the
Fuel
Oil
Controller . . .
75
psi
Oil
Burner
Pressure Guage . . . . .30-45
psi
CHAPTER4-6
Starting - When
all
the
conditions covered
above
and
in
Sections A,
B,
C
and
D are assured,
the
burner
is
ready for firing. Refer to Section H
?f
this
c~apter
for
funher starting
and
operating
mfortnation.
F.
FIRING
PREPARATION
FORNO. SOIL
(SERIES
400-600)
Prior to initial firing, the oil flow, pressure,
and
temperature should be established
and
verified.
The atomizing air pressure should also
be estab-
lished
as
outlined
in
Section
D.
The schematic
flow
diagram (Fig.1-12) indicates
the
flow
of
fuel
and
atomizing
air.
If
the
boiler
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
burnet 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. Open
the
by-pass valve on
the
fuel
oil
controller (Fig.
1..6)
until
the
oil
flow
is
established. Nonnally,
the
orifice valve
is
left
in
a closed position. However, on cold starts,
it
may
be
opened
for
brief periods
to
aid
in
establishing
oil
flow.
The by-pass
and
orifice valves
must
be
returned
to
a closed position
as
soon
as
proper
oil
flow
is
established
as
indicated
by
a reading
on
the
oil
supply pressure gauge (Figs. 1-2
and
1..S).
Do not attempt
to
set pressures while these valves
are
open.
Momentarily energize
the
fuel
oil pump starter
to
check for proper pump rotation. With
the
rotation
verified, prime the suction line strainer with
oil
and
start
the
fuel
oil pump
by
closing its power
entrance switch. Observe
the
oil supply pressure
gauge
for
indication
that
oil
flow
is established.
If
no
pressure shows on gauge after a
few
mo-
ments,
stop
the
oil
pump
and
re-prime.
Heavy
oil
in
the
storage tank
must
be
at
a temperature
to
provide
oil
viscosity to permit
flow
through
the
oil
pump
and
suction
line.
If oil
flow
is
not
750-150
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