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

Fuel Pressure Adjustment:
To adjust fuel pressure, turn the adjusting screw with a
standard screwdriver (located on the fuel pump) clock-
wise to in crease, coun ter clock wise to decrease. Do not
ex ceed 200 PSI.
Karcher Clearfi re Oil Burner
Burner Air Adjustment: The oil burner on this machine
is preset for operation at altitudes below 500 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.
18
MAINTENANCE
Burner Air Adjustment
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 fl ue is installed, have a professional service-
man adjust your burner for a #1 or #2 smoke spot on
the Bacharach scale.
HDS 505, 508, 509, 510 • 9.800-078.0 - N
Reference Numbers
Air Band