Rupture Disk - Kärcher HDS 3.9/30 Pe Cage Operator's Manual

Deliming Coils:
Periodic flushing of coils or optional float tank is
recommended.
Step 1 Fill a container with 4 gallons of water, then .
add 1 lb. of deliming powder. Mix thoroughly.
Pour mixture into float tank.
Step 2 Remove wand assembly from spray gun and
put spray gun into float tank. Secure the trig-
ger on the spray gun into the open position.
Step 3 Turn engine on, allowing solution to be
pumped through coils back into the float tank.
The solution should be allowed to circulate 2- 4
hours or until the color changes.
Step 4 After circulating solution, flush the entire
system with fresh water. Clean out float tank
and then reinstall 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 flow 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).

Rupture Disk:

If pressure from pump or thermal expansion should
exceed safe limits, the rupture disk will burst allowing
high pressure to be discharged through hose to ground.
When disk ruptures it will need to be replaced.
Fuel:
Use clean fuel oil that is not contaminated with water
and debris. Replace fuel filter and drain tank every 100
hours of operation.
Use No.1 or No 2 Heating Oil (ASTM D306) only.
NEVER use gasoline in your burner fuel tank. Gasoline
is more combustible than fuel oil and could result in a
serious explosion. NEVER use crankcase or waste oil
in your burner. Fuel unit malfunction could result from
contamination.
Fuel Control System:
This machine utilizes a fuel solenoid valve located on
the fuel pump to control the flow of fuel to the combus-
tion chamber. The solenoid, which is normally closed,
is activated by a flow switch when water flows through
it. When the operator releases the trigger on the spray
gun, the flow of water through the flow switch stops,
turning off the electrical current to the fuel solenoid.
The solenoid then closes, shutting off the supply of
fuel to the combustion chamber. Controlling the flow
of fuel in this way gives an instantaneous burn-or-no-
burn situation, thereby eliminating high and low water
MAINTENANCE
temperatures and the combustion smoke normally
associated with machines incorporating a spray gun.
Periodic inspection, to insure that the fuel solenoid
valve functions properly, is recommended. This can
be done by operating the machine and checking to
see that the burner is not firing when the spray gun is
in the OFF position.
Fuel Pressure Adjustment:
To control water temperature, adjust fuel pressure
by turning the regulating pressure adjusting screw
clockwise to increase, counterclockwise to decrease.
Do not exceed 200 psi. NOTE: When changing fuel
pump, a bypass plug must be installed in return port
or fuel pump will not prime.
Burner Nozzle:
Keep the tip free of surface deposits by wiping it with
a clean, solvent saturated cloth, being careful not to
plug or enlarge the nozzle. For maximum efficiency,
replace the nozzle each season.
Electrode Setting
98000800-30
Top View
Periodically Check Wiring Connections. If Necessary
Beckett Burner Air Adjustment:
The oil burner on this machine is preset for opera-
tion at altitudes below 1000 ft. If operated at higher
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. A one-time initial correction for
your location will pay off in economy, performance,
and extended service life. 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 is being
used. Next, check the air adjustment on the burner.
To adjust, start machine and turn burner ON. Loosen
two locking screws found in the air shutter openings
(refer to illustration) and close air shutter until black
smoke appears from burner exhaust vent. Note air
band position. Next, slowly open the air shutter until
9.800-080.0 - G • HDS 600-606
5/32" Gap
Electrode
5/16"
1/16"
To Adjust Electrodes, Use Diagram.
Nozzle
Side View
13