Kärcher 1.575-511.0, Manual

Manual Karcher 9.800-191.0

OPERA

TOR’S MANUAL

 PRESSURE 

W

ASHER  

12

PREVENTATIVE MAINTENANCE AND SERVICE

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 

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.

Air Band 

Locking Screw

Air Band

NOTE: 

When changing fuel pump, a by-pass plug must 

be installed in return line port or fuel pump will not prime.

Karcher Clear Fire 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.

KNA 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.