14
Maintenance
Preventative Maintenance
•
Use clean fuel - kerosene, No. 1 home heating
fuel or diesel. Clean or replace fuel filter every
100 hours of operation. Avoid water contami-
nated fuel as it will seize up the fuel pump. De-
soot coils monthly or use an additive if diesel is
being used.
•
Check to see that water pump is properly lubri-
cated.
•
Follow winterizing procedure to prevent freeze
damage to pump and coils.
•
Always flush detergents from system after use.
•
If water is known to be high in mineral content,
use a water softener on your water system or
use a
LANDA
recognized coil cleaning deter-
gent.
•
Do not allow acidic, caustic or abrasive fluids to
be pumped through the system.
•
Always use high grade quality
LANDA
cleaning
detergents.
•
Never run pump dry for extended periods of
time.
•
Periodically descale coils per instructions.
•
If machine is operated with smoky or eye-
burning exhaust, coils will soot up and prevent
water from reaching maximum operating tem-
perature. See section on burner adjustments.
Maintenance And Service
Pump Lubrication
Use only
LANDA
SAE 10W-40 weight, non-foaming oil.
Change oil after first 50 hours of use. Thereafter,
change oil every year or at 500 hour intervals. Oil level
should be checked through use of dipstick found on top
of pump or red dot visible through oil gauge window. Oil
should be maintained at that level
Fuel
Use clean (not contaminated with water and debris)
kerosene, No. 1 home heating fuel or diesel. Drain fuel
tank and replace fuel filter every 100 hours of opera-
tion.
Electrode Setting
Ignition Circuit
Periodically inspect wires, spring contact and elec-
trodes for condition, security and proper spacing.
Transformer test:
CAUTION:
10,000 volts — use defect
free insulated 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
below).
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 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
clockwise 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.
Burner Nozzle
Keep tip free of surface deposits by wiping with clean,
solvent-saturated cloth, being careful not to plug or
enlarge nozzle. For maximum efficiency, replace nozzle
each season.
Landa PHW Operator’s Manual 8.917-417.0 - D
1/8" Gap
10/32"
1/16"
Electrode
Nozzle
EL
YRIA,
OHIO, U.S.A.
