Landa PHW2-1100 Operator's Manual page 9

PHW SERIES PRESSURE WASHER
Ignition Circuit:
Periodically inspect wires, spring contact and electrodes
for condition, security and proper spacing. Transformer
test: CAUTION: 10,000 volts — use defect free insu-
lated screwdriver and keep fingers off blade! Lay blade
across one contact: OK if arc will span 1/2" between end
of blade and other contact (see illustration).
Transformer Check:
Fuel Control System:
These machines utilize a fuel solenoid valve located on
the fuel pump to control the flow of fuel to the combus-
tion chamber. This solenoid, which is normally closed, is
activated by the flow switch. When an operator releases
the trigger on the spray gun, the unloader goes into a
by-pass mode, thus stopping electrical current 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 ma-
chine 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
bypass plug must be installed in return line port or fuel
pump will not prime.
Air Shutter
Locking Screw
Air Shutter
Air Band
Air Band Locking
Air Shutter
Locking Screw
Screw
LANDA PHW • 9/02
OPERATOR'S MANUAL
Burner Nozzle:
Keep tip free of surface deposits by wiping with clean,
solvent-saturated cloth, being careful not to plug or en-
large nozzle. For maximum efficiency, replace nozzle
each season.
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 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. An oily, smoky fire indi-
cates a lack of air and the air band should be moved to
allow the air to flow through the burner. Sharp eye-burn-
ing fumes indicate too much air flowing through the com-
bustion chamber. The air band should be readjusted to
allow less air to flow through the burner.
To adjust, start machine and turn burner ON. Loosen
two locking screws found in the air shutter openings (re-
fer to illustration) and close air shutter until black smoke
appears from burner exhaust vent. Note air band posi-
tion. Next, slowly open the air shutter until white smoke
just starts to appear. Turn air shutter halfway back to the
black smoke position previously noted. Tighten locking
screws.
If the desired position cannot be obtained using only the
air shutter, lock the air shutter in as close a position as
can be obtained, then repeat the above procedure on
the air band setting.
Cleaning of Coils:
In alkaline water areas lime deposits can accumulate
rapidly inside the coil pipes. This growth is increased by
the extreme heat buildup in the coil. In areas where al-
kaline water is an extreme problem, periodic use of
LANDA Deliming Powder will remove lime and other de-
posits before coil becomes plugged. (See Deliming in-
structions 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.
9