Landa PGHW4-3000 Operator's Manual - Pghw Series Pressure Washer
10
PGHW SERIES PRESSURE WASHER
OPERATOR’S MANUAL
LANDA PGHW • 96-6031 • REV. 7/03
Removal of Soot and 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 on page 11).
Rupture Disk:
If pressure from pump or thermal expansion should ex-
ceed 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. Torque new rup-
ture disk to 35 ft. lbs.
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 ex-
plosion. 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 combustion cham-
ber. The solenoid, which is normally closed, is activated by
a flow switch when water flows through it. When the opera-
tor releases the trigger on the spray gun, the flow of water
through the flow 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 flow of fuel in this
way gives an instantaneous burn-or-no-burn situation,
thereby eliminating high and low water 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 recom-
mended. 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 turn-
ing 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.
Electrodes Setting: Wayne
(See Illustration Below)
Electrodes Setting: Beckett
(See Illustration Below)
Air Adjustment:
Machines are preset and performance tested at the fac-
tory - elevation 100'. A one-time initial correction for your
location will pay off in economy, performance, and ex-
tended 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 kero-
sene or No. 1 home heating fuel is being used. Next,
check the air adjustment on the burner.
Gap
1/8"
1/8"
3/8"
1/2"
3/16"
Top View
Side View
Nozzle
Adapter
2-7/8"
Periodically Check Wiring Connections. If Necessary
To Adjust Electrodes, Use Diagram.
Electrodes
1/16"
5/32" Gap
Nozzle
7/16"
Electrode
Top View
Side View