Kärcher TRS-SSG • Operators • 9.801-330.0-G
21
PRESSURE W
ASHER
OPERA
T
OR’S MAN
U
AL
PRESSURE WASHER MAINTENANCE
Deliming Coils:
Periodic flushing of coils or optional float tank is
rec om mend ed.
Step 1
Fill a container with 4 gallons of wa ter, then .
add 1 lb. of deliming pow der. Mix thor ough ly.
Pour mixture into fl oat tank.
Step 2
Remove wand assembly from spray gun and
put spray gun into fl oat tank. Se cure the trig-
ger on the spray gun into the open po si tion.
Step 3
Turn engine on, allowing solution to be
pumped through coils back into the fl oat tank.
The solution should be al lowed to cir cu late 2- 4
hours or until the color chang es.
Step 4
After circulating solution, flush the en tire
system with fresh water. Clean out fl oat tank
and then re in stall wand assembly to spray gun.
Removal of Soot from Heating Coil:
In the heating process, fuel residue in the form of soot
deposits may develop between the heating coil pipe,
and block air fl ow which will affect burner combustion.
When soot has been detected on visual observation,
the soot on the coil must be washed off after following
the coil removal steps (See Coil Removal section).
Relief Valve
If pressure from pump or thermal expansion should
exceed safe limits, the relief valve will burst allowing
high pressure to be discharged through hose to ground.
Fuel:
Use clean fuel oil that is not contaminated with water
and debris. Replace fuel fi lter and drain tank every 100
hours of operation.
Use No.1 or No 2 Heating Oil (ASTM D306) only.
NEV ER use gasoline in your burner fuel tank. Gas o line
is more combustible than fuel oil and could result in a
serious ex plo sion. NEVER
use crankcase or waste oil
in your burn er. Fuel unit malfunction could result from
con tam i na tion.
Fuel Control System:
This machine utilizes a fuel solenoid valve located on
the fuel pump to control the fl ow of fuel to the com bus -
tion cham ber. The solenoid, which is normally closed,
is activated by a fl ow switch when water fl ows through
it. When the op er a tor releases the trigger on the spray
gun, the fl ow of water through the fl ow switch stops,
turning off the electrical cur rent to the fuel solenoid.
The solenoid then closes, shutting off the supply of
fuel to the combustion chamber. Controlling the fl ow
of fuel in this way gives an instantaneous burn-or-no-
burn sit u a tion, there by eliminating high and low water
tem per a tures and the combustion smoke normally
as so ci at ed with ma chines in cor po rat ing a spray gun.
Pe ri od ic in spec tion, to insure that the fuel solenoid
valve func tions properly, is rec om mend ed. This can
be done by op er at ing the ma chine and checking to
see that the burner is not fi ring when the spray gun is
in the OFF position.
Fuel Pressure Adjustment:
To adjust fuel pressure, First install a pressure gage
into the port just after the pump fuel exit. Turn the
adjusting screw (located at the regulator port)
clockwise to increase, and counterclockwise to
decrease. Do not exceed 200 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
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 temperature
inlet can impact fuel fl ow. In more extreme tempera-
tures, 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 temperature changes are beyond moderate
temperatures of between 40°F and 90°F. Colder
temperatures will make for a thicker fl ow and less fi ne a
fuel spray while hotter temperatures will make for a
thinner fl ow a more fi ne spray with the same nozzle.
Consider alternate nozzle confi gurations 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.
