CHAPTER4
STARTING AND OPERATING INSTRUCfiONS
D.
ATOMIZING
AIR
The supply and pressure
of
the atomizin'g air on
an
oil fired burner should be checked. Before
starting,
inspect the oil pump lube oil level. Add
oil
if
necessary to bring the level to the mid-point
or slightly higher
of
the sight glass. Use SAE 20
detergent oil
of
a grade mentioned
in
Chapter 7
and
fill in accordance with the instructions given
there.
Check the oil level
of
the air intake strainer.
To
verify air flow and pressure, place the run/test
switch on the program relay
to
the test position.
If
this
is
a combination fuel burner, make sure
that the gas/oil selector switch
is
set
to
"oil." Tum
the
burner switch on. The burner will cycle
to
the
low
fire pre-purge position and stop there.
Observe the
readmg on the air pressure gauge
(Fig. 4-1). With
no
oil flow, the pressure should
be
a minimum
of
7
psi.
If
there
is
no
pressure, determine the
cause
and
correct it before proceeding. Check for obstruc·
tions
in
the air inlet line, incorrect rotation (air
pump rotation
is
clockwise), or a loose oil nozzle
or other leaks.
If
the pressure
is
much higher
without
any
oil flow, check for
an
obstruction·in
the
discharge line or at
the
oil nozzle.
The air pressure will increase when an oil flow
exists. At low firing rate, the air pressure may rise
to 12 psi or more.
CAUTION!
The
air
pressure
should
not
ex-
ceed 30
psi
at
high
fire. Greater
air
pressure
causes
excessive
wear
of
the
air
pump,
Increases
lube
oil
usage, and can
overload
the
motor,
thus
causing
damage
to
the
equipment.
CHAPTER4-4
FUB.OIL
UNE
0RAweA
IN
FOFIWAFIO
POSITION
FOR
EI.IRNING
OIL
OAAWER
IN
REAFIWAAD
POSITION
~
EI.IRNING
GAS
[FIGURE
4-1 I
POSITIONS
OF
BURNER DRAWER
FOR
OIL AND
GAS]
750-150
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