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A.1 OIL BURNER AIR ADJUSTMENT
For complete details, consult the oil burner instruction
manual provided in the furnace documents envelope.
Beckett AF Burner
Adjust the air shutter by loosening the locking screws
and moving the air shutter, and if necessary, the bulk
air band.
Beckett AFII Burner
Adjust
the
burner
air supply
by
first loosening
the
locking screw located on the black dial to the right of
the burner.
Turn the black dial clockwise to increase
the combustion
air and counter-clockwise to decrease
the combustion air.
Re-tighten the locking screw after
obtaining the proper setting.
A.2 BURNER ELECTRODES
Adjustment of the electrode tips with respect to each
other, the nozzle, and to the rest of the burner is very
important
to ensure
smooth
start-ups
and
to permit
efficient combustion.
Beckett AF Burner
Electrode gap: 5/32 inch.
Distance above
horizontal centerline: 5/16 inch. Older
instruction
sheets
specify
7/16
inch.
The
current
specification is 5/16 inch.
Distance ahead of nozzle:
1/16 inch.
"Z' dimension,
the distance from the front of the end
cone (head) to the face of the nozzle should be 1-1/8
inches.
If a ceramic
head
is used,
the distance from
the end cone to the nozzle face is increased to 1-3/8
inches.
11
A.3 START UP
The furnace should be operated for a minimum
of 10
minutes
to reach
steady
state
conditions
before fine
tuning
combustion.
The
warm
up
time
is
ideal
for
testing the oil pump pressure.
Drill a 1/4-inch
test port in the venting
between
the
furnace
flue
outlet
and
draft
regulator
(barometric
damper).
Insert a stack thermometer and note the flue
gas
temperature.
The
flue gases
should
be within
a
range of 350°F to 450°F.
If the flue gases
are below
the
range,
it may
be
necessary
to
slow
down
the
blower fan. If the flue gases are above the range, the
blower
fan
may
require
speeding
up.
Stack
temperature
varies
directly
with
the
system
temperature
rise.
System
temperature
rise
is
the
difference between the furnace outlet temperature and
furnace inlet temperature as measured in the vicinity of
the connection
between
the plenum
take-offs and the
trunk
ducts.
Temperature
rise value
is listed on
the
system rating plate.
Perform a smoke spot test. The smoke spot should not
exceed No. 1 on the Bacharach Scale.
After the
air adjustments
have
been
completed,
re-
check the draft pressure at the test port on the burner
mounting plate as shown
in Figure 2. The draft should
be adjusted to -0.02 inches w.c.
In the United
States,
the Beckett AF
Burner
may
be
equipped with Beckett's "Inlet Air Shut-Off" to increase
efficiency. (Beckett Part No. AF/A 5861).
NOTE: USE OF THE INLET AIR SHUT-OFF COULD
CAUSE POST COMBUSTION NOZZLE DRIP.
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