CHAPTER4
STARTING AND OPERATING INSTRUCfiONS
establis~ed
a;fter
several attemps, the conditions
preventing
oil flow must be determined and cor-
rected
~
avoid damage
to
the pump's internal
mechaniSm.
A vacuum (or
~ompound
pressure-vacuum)
gauge should
be mstalled in the oil suction line
and
its reading observed and recorded for future
guidance. This gauge reveals the tightness
of
the
system.
On
P~re
- Oil pressure
is
regulated at
several
points. The first
is
at the oil heater relief
valve (Figs.
1-2 and 1-8). This should be set so
that at maximum firing rate a minimum reading
of
75
psi
is
obtained on the oil supply pressure
gauge.
The other pressure adjustments are made at the
regulators on the fuel oil controller (Fig. 1-6).
Both
th~
pressure
regulat~ng
and the back pres·
s~re
rehef valves are equipped with tubing that
di~ts
and
a~ds
atomizing air pressure
to
the
adjustabl~
spnng
pr~ure.
Since the air pump
is
not runnmg at
th1s
time, only tentative adjust-
ments can be made. Without this air supply
adjust
th~
fuel oil pressure regulator so that
th~
burner
~II
p~ure
gauge registers approximate-
ly
3S.pst.
AdJUSt
the back pressure relief valve so
that
Its
gauge reads about 10 psi less than the
burner gauge.
After the burner
is
firing, further adjustments can
be
made if necessary
to
these valves.
The pressure will
be higher when a flame
is
present, and will increase as the firing rate in-
creases. The pressure
re~ding
on the two gauges
on the controller will, despite this fluctuation
should
be adjusted
to
retain a nearly constant
difference
of
10 psi.
Final regulation
of
oil flow to the nozzle can be
done,
if
necessary, by adjusting the metering cam
screws as outlined
in
Chapter
S.
Suggested oil pressures at high fire operation:
750-150
•
•
•
Oil supply at the fuel oil controller -
75
psi (minimum at maximum firing
rate).
Oil burner pressure gauge -
40-SO
psi
Oil return pressure gauge -
10 psi less
than oil supply pressure.
on
Temperature
CAUTION!
Before
turning
on
the
electric
oil
heater
switch,
make
certain
that
the
heater
shell
is
filled
with
fuel
oil
and
the
flow
Is
established
in
order
to
avoid
damage
to
the
equipment.
After determining that the heater shell
is
filled
and that fuel oil circulation exists, tum the oil
heater switch
to
"on." Adjust the electric oil
hea~r
thermostat (Figs. 1-2 and 1-8)
to
maintain
an
od temperature
of
approximately 200°F.
The electric heater on burners equipped for No.
6 fuel oil. is sized so that it
is
capable
of
supplying
heated
ml at a rate no greater than that required
for low
fue. operation and
is
primarily supplied
fo~.
C?nve~:uence
on cold starts. Heating coils
utllt~tng
etther.steam
or
hot water are supplied
to
provide suffictent heat so that higher rates
of
firing can
he:
acco~plished
once steam pressure
or hot water
IS available. In normal operation, the
thermostat governing the electric heating ele-
ment
is
kept at a lower setting than the thermostat
governing the admission
of
steam or hot water
circul~tion,
so that heating
is
not performed
electncally except when steam or hot water
is
not
available.
Set the steam thermostat (Fig. 1-8)) or the hot
water thermostat (Fig.
1-2) to maintain an oil
temperature
of
220·230°F. The electric heater
will
be turned
off
automatically
as
soon
as
steam
or hot water provides heat.
CHAPTER 4-7
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