PHW/PHWS SERIES PRESSURE WASHER
OPERATOR’S MANUAL
9
Fuel Control System:
These machines utilize a fuel solenoid valve located on
the fuel pump to control the flow of fuel to the combustion
chamber. This solenoid, which is normally closed, is acti-
vated by the unloader's pressure switch. When an opera-
tor releases the trigger on the spray gun, the unloader
goes into a by-pass mode, thus stopping electrical cur-
rent to the fuel solenoid coil. With the solenoid closed, the
fuel supply to the combustion chamber ceases. 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 when the spray gun
is in the off position, the burner is not firing.
Fuel Pressure Adjustment:
To adjust fuel pressure, turn the adjusting screw clock-
wise to increase, counterclockwise to decrease. Do not
exceed 200 PSI.
NOTE:
When changing fuel pump, a by-
pass plug must be installed in return line port or fuel pump
will not prime. (See illustration below.)
Burner Nozzle:
Keep tip free of surface deposits by wiping with clean, sol-
vent-saturated cloth, being careful not to plug or enlarge
nozzle. For maximum efficiency, replace nozzle each sea-
son.
Air Adjustment:
Machines are preset and performance tested at the fac-
tory elevation of 100'. A onetime 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. An oily, smoky fire indicates a lack of air
and the air band should be moved to allow the air to flow
through the burner. Sharp eye-burning fumes indicate too
much air flowing through the combustion chamber. The
air band should be readjusted to allow less air to flow
through the burner.
Cleaning of Coils:
In alkaline water areas lime deposits can accumulate rap-
idly inside the coil pipes. This growth is increased by the
extreme heat buildup in the coil. In areas where alkaline
water is an extreme problem, periodic use of
LANDA
Deliming Powder will remove lime and other deposits be-
fore coil becomes plugged. (See Deliming instructions for
use of
LANDA Deliming Powder).
Deliming Coils:
Periodic flushing of coils is recommended.
1. Fill the float tank with 4 gallons of water, then add 1 lb.
of deliming powder. Mix thoroughly.
2. Remove nozzle from wand assembly and put spray
gun and wand assembly into float tank. Attach a ny-
lon stocking to the end of the wand to collect debris.
3. Turn pump switch on, allowing solution to be pumped
through coils and back into the float tank. Solution
should be allowed to circulate 2 - 4 hours.
4. After circulating solution, clean and drain float tank
and flush entire system with fresh water. Replace
nozzle in wand.
Spray Nozzles:
Each machine is equipped with one spray nozzle. Differ-
ent spray nozzles are calibrated for each machine depend-
ing on the flow and pressure of that particular model. Spray
nozzles vary in bore size and angle of spray. Popular spray
angles are 0°, 15°, 25° and 40°. When ordering, please
specify size and angle of nozzle. Nozzle size for each ma-
chine is located on the serial plate.
Unloader Valves:
Unloader valves are preset and tested at the factory be-
fore shipping. Occasional adjustment of unloader may be
necessary to maintain correct pressure. (See section in
manual and consult your local
LANDA Dealer for the cor-
rect procedures in adjusting the unloader valve.)
Winterizing Procedure:
Damage due to freezing is not covered by warranty. Ad-
here to the following cold weather procedures whenever
the washer must be stored or operated outdoors under
freezing conditions.
Pressure
Gauge Port
Return Line with
1/16" By-pass Plug
Adjusting
Screw
7-0009611
115V Solenoid Kit
Air Adjustment
Screw
7-3713824
115V Coil
7-3753895
Cord Set
7-0009
Fuel Unit
Air Band