8.913-943.0 • LANDA HS • Rev. 4/13
OPERA
TOR’S MANU
AL
PRESSURE
W
ASHER
12
MAINTENANCE & SERVICE
PREVENTATIVE
MAINTENANCE
1. Use clean fuel - kerosene, No. 1 home heating
fuel or diesel. Clean or replace fuel filter every
100 hours of operation. Avoid water contaminated
fuel as it will seize up the fuel pump. De-soot coils
monthly. Use an additive if diesel is being used.
2. Check to see that the attached pressure washer
water pump is properly lubricated.
3. Follow winterizing instructions to prevent freeze
damage to pump and coils.
4. Always neutralize and flush detergent from system
after use.
5. If water is known to be high in mineral content, use
a water softener on your water system, or de-scale
as needed.
6. Do not allow acidic, caustic or abrasive fluids to
be pumped through system.
7. Always use high grade quality Landa cleaning
products.
8. Never run attached pressure washer pump dry for
extended periods of time.
9. If machine is operated with smoky or eye burning
exhaust, coils will soot up, not letting water reach
maximum operating temperature. (See section on
Air Adjustments).
10. Never allow water to be sprayed on or near the
motor or burner assembly or any electrical com-
ponent.
11. Delime coils as per instructions.
It is advisable, periodically, to visually inspect the
burner. Check air inlet to make sure it is not clogged
or blocked. Wipe off any oil spills and keep this equip-
ment clean and dry.
The areas around the Landa washer should be kept
clean and free of combustible materials, gasoline and
other flammable vapors and liquids.
The flow of combustion and ventilating air to the burner
must not be blocked or obstructed in any manner.
MAINTENANCE AND SERVICE
Winterizing Procedure
Damage due to freezing is not covered by warranty.
Adhere to the following cold weather procedures when-
ever the washer must be stored or operated outdoors
under freezing conditions.
During winter months, when temperatures drop be-
low 32°F, protecting your machine against freezing is
necessary. Store the machine in a heated room. If this
is not possible use compressed air on the 9 ft. hose
end and, by injecting compressed air, all water will be
blown out of the system.
High Limit Thermostat
For safety, each machine is equipped with a high limit
control switch. In the event the temperature of the water
should exceed its operating temperature the high limit
control will turn the burner off until the water cools.
Cleaning of Coils
In alkaline water areas, lime deposits can accumulate
rapidly inside the coil pipes. This growth is increased
by the extreme heat build up in the coil. The best
prevention for liming conditions is to use high quality
cleaning detergents. In areas where alkaline water is
an extreme problem, periodic use of Landa Delim-
ing Powder (Landa Part #9-028008) will remove lime
and other deposits before coil becomes plugged.
(See Deliming Instructions for use of Landa Deliming
Powder.)
Deliming Coils
Periodic flushing of coils or optional float tank is rec-
ommended.
Step 1 Fill a container or float tank with 4 gallons
of water, then add 1 lb. of deliming powder.
Mix thoroughly.
Step 2 Remove nozzle from wand assembly and
put spray gun and wand assembly into float
tank. Attach a nylon stocking to the end of
the wand to collect debris.
Step 3 Attach a short section (3-5 ft.) of garden
hose to the attached pressure washer to
siphon solution from an elevated container.
Turn attached pressure washer switch on,
allowing solution to be pumped through coils
back into the container. Solution should be
allowed to circulate 2-4 hours.
Step 4
After circulating solution flush entire system
with fresh water. Reinstall high pressure
nozzle into wand.
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 follow-
ing the coil removal steps (See Coil Removal on page
10).
Rupture Disk
If pressure from pump or thermal expansion should
exceed safe limits, the rupture disk will burst, allow-
ing high pressure to be discharged through hose
to ground. When the disk ruptures it will need to
be replaced. Inspect rupture disk annually for any
obstructions.
