Kärcher HDS 3.9/20 Ea Cage Operator's Manual page 18

MAINTENANCE
FUEL AIR ADJUSTMENT: BECKETT
Next, check the air adjustment on the burner. An oily,
black, smoky fire indicates a lack of air and the air
band should be moved to allow the air to flow through
the burner. Sharp, eye-burning white fumes indicate
too much air flowing through the combustion chamber.
Air Band
The air band should be moved to allow less air to flow
through the burner.
Transformer
To adjust: start machine and turn burner ON. Loosen
the two locking screws found in the air shutter openings
(refer to illustrations) and close air shutter until black
smoke appears from burner exhaust vent. Note air band
position. Next, slowly open the air shutter until white
98000780-24
Fuel
smoke just starts to appear. Turn air shutter halfway
Pump
back to the black smoke position previously noted.
Tighten locking screws.
Air Band
If the desired position cannot be obtained using only
Pressure
Adjustment
the air shutter, lock the air shutter in as close a position
Gauge Port
Screw
as can be obtained, then repeat the above procedure
Pressure
on the air band setting.
Adjustment Screw
Karcher Clearfire Oil Burner
Burner Air Adjustment: The oil burner on this machine
is preset for operation at altitudes below 1000 feet. If
operated at higher altitudes, it may be necessary to
adjust the air band for a #1 or #2 smoke spot on the
Bacharach scale.
To adjust, start machine and turn burner ON. Loosen
two locking screws found on the air band and close air
band until black smoke appears from burner exhaust
vent. Note air band position. Next, slowly open the air
band until white smoke just starts to appear. Turn air
band halfway back to the previously noted position.
Tighten locking screws.
Burner Air Adjustment
Reference Numbers
Air Band
Air Band Locking Screws
CAUTION: If white smoke appears from burner
exhaust vent during start-up or operation, discon-
tinue use and readjust air bands.
NOTE: If a flue is installed, have a professional service-
man adjust your burner for a #1 or #2 smoke spot on
18
the Bacharach scale.
HDS 505, 508, 509, 510 • 9.800-078.0 • Rev. 4/13