Maintenance & Service - Kärcher Landa HOT 2-1100 Operator's Manual

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 settings. 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 tem-
perature inlet can impact fuel flow. In more extreme
temperatures, this local-site adjustment may also
require different fuel nozzles for fuel inlet tempera-
tures that are at seasonal extremes (higher or lower)
in locations where the temperature changes are
beyond moderate temperatures of between 40°F and
90°F. Colder temperatures will 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 configura-
tions from the baseline factory-supplied nozzle for
operating in such temperature extremes if perfor-
mance 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.
Burner Air Adjustment
Air
Band
Fuel
Pump
Locking Screws
The oil burner on this machine is preset for opera-
tion altitudes near 1700 feet. If operated at higher or
lower altitudes, it may be necessary to adjust the air
band setting. Adjust air band for a #1 or #2 smoke
spot on the Bacharach scale. If a smoky or eye-
burning exhaust is being emitted from the stack, two
things should be checked. First, check the fuel to be
certain that kerosene or No. 1 home heating fuel or
No. 2 Diesel being used. Next, check the air adjust-
ment on the burner. An oily, black, smoky fire indi-
cates a lack of air and the air band should be moved
to allow the air to flow through the burner. Sharp
14
MAINTENANCE & SERVICE
Air Adjustment
Screw
8.917-208.0 • HOT • Rev. 05/17
eye-burning white fumes indicate too much air flow-
ing through the combustion chamber. The air band
should be moved to allow less air to flow through the
burner.
To adjust, Loosen locking screw found on the air
band. Start machine and turn burner ON 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 ap-
pear and note air band position, again. Rotate the air
band halfway between to the previously noted posi-
tions. Tighten locking screws. Typical distance from
the 'black smoke' position is roughly 3/8"-1/2" more
open from the point of visible black smoke, but may
vary based upon local operating conditions.
• For higher altitudes, the air band opening may
need to be increased; for lower altitude, the air band
may need to be decreased.
• For higher humidity, the air band opening may
need to be increased; for lower relative humidity, the
air band may need to be decreased.
• For higher ambient temperatures the air band
opening may need to be increased; for lower ambi-
ent temperatures, the air band opening may need to
be decreased.
Adjust the burner to your operating location's envi-
ronment as-needed for best smoke spot and per-
formance compliant with local, state, and federal
regulations.
Example: a unit preset at a factory at 1700 feet
altitude with an air band of 1.1" and fuel pressure
of 190 PSI with Ambient temperature of 72 °F and
a relative humidity of 84% using #2 Diesel fuel oil.
The unit is shipped to a location at 5300 feet altitude
with ambient air temperature of 59 °F and a relative
humidity of 25%. The air band required adjustment
to 1.8" opening and fuel pressure lowered to 150 PSI
for a high altitude adjustment for both heat input ad-
justments and combustion air intake with the same
fuel type.