240005126 Rev A 10/27/2005
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Burner information for the HTL series furnace.
Table A-1 Beckett AF Oil Burner Set-Up
Beckett AF Series Oil Burner
Furnace
Model
Output
BTU/Hr
Burner
Model
Nozzle
Pump
Pressure
Flow Rate
Head
1
Static
Plate
HTL-80C
79,000
AF65XN
0.65 / 80°A
100
PSIG
0.65
USGPH
F3 2-¾
in.
HTL-90C
90,000
AF65XN
0.75 / 80°A
100
PSIG
0.75
USGPH
F3 2-¾
in.
HTL-100C
101,000
AF65XN
0.85 / 80°A
100
PSIG
0.85
USGPH
F3 2-¾
in.
HTL-120C
119,000
AF65XN
1.00 / 60°A
100
PSIG
1.00
USGPH
F3 2-¾
in.
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.
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.
A.3 START UP
The furnace should be operated for a minimum of 15
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. Typical temperature rise values range
between 65°F and 95°F.
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 furnace burner
mounting plate 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
RESULTING IN HIGHER SMOKE LEVELS AND
PREMATURE SOOTING OF THE HEAT
EXCHANGER.
Appendix A
HTL-C
