Manual Karcher STP 9.801-191.0 - B
11
PRESSURE W
ASHER
OPERA
TOR’S MANU
AL
PREVENTATIVE MAINTENANCE AND SERVICE
If the desired position cannot be obtained using only
the air shutter, lock the air shutter in as close a position
as can be obtained, then repeat the above procedure
on the air band setting.
CAUTION: If white smoke appears from burner
exhaust vent during start-up or operation, discon-
tinue use and readjust air bands.
Wayne Burner Fuel Pressure Adjustment:
To adjust fuel pressure, first install a pressure gage into
the port just after the pump fuel exit. Turn the adjust-
ing screw (located at the regulator port) clockwise to
increase, and counterclockwise to decrease. Do not
exceed 205 psi or lower the pressure below 130 PSI,
when checked at the post-pump pressure port.
The fuel pressure may need to be adjusted due to
altitude. For every 500 ft altitude above sea level, the
boiling point of water goes down 1 °F. At high altitude
environments, this boiling point change may require
the heat input to be lowered so the water input does
not turn to steam earlier than at the factory settings
and activate the pressure sensors and pressure relief
equipment when the unit is operated and much higher
altitudes from factory settings or local dealer site set-
tings. Check with your dealer before making local site
fuel pressure adjustments.
Also, as ambient temperature changes seasonally, the
fuel temperature in the feed tank and air temperature in-
let can impact fuel flow. In more extreme temperatures,
this local-site adjustment may also require different fuel
nozzles for fuel inlet temperatures that are at seasonal
extremes (higher or lower) in locations where the tem-
perature changes are beyond moderate temperatures
of between 40°F and 90°F. Colder temperatures will
Air Band
Locking Screw
Air Band
make for a thicker flow and less fine a fuel spray while
hotter temperatures will make for a thinner flow a more
fine spray with the same nozzle. Consider alternate
nozzle configurations from the baseline factory-supplied
nozzle for operating in such temperature extremes if
performance is not meeting needs with air band and
fuel pressure settings alone.
NOTE:
When changing fuel pump, a by-pass plug must
be installed in return line port or fuel pump will not prime.
KNA Clear Flame 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 Locking Screws
Air Band
CAUTION:
If white smoke appears from burner ex-
haust vent during start-up or operation, discontinue
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
the Bacharach scale.
