8.914-364.0/97-6263 • Hotsy 9450/9460OF • Rev. 3/09
13
PRESSURE WASHER
OPERATOR’S MANUAL
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 Procedures to prevent freeze
damage to pump and coils.
4. Always neutralize and flush chemical 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 Hotsy 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).
1 0. Never allow water to be sprayed on or near the
motor or burner assembly or any electrical com-
ponent.
1 1. Delime coils 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 to blow all water
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 chemicals. In areas where alkaline water is
an extreme problem, periodic use of Deliming Pow-
der will remove lime and other deposits before coil
becomes plugged.
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. Verify mixing ratio on deliming powder
package.
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 following
the coil removal steps.
Relief Valve
WARNING: The relief valve on this pressure washer
has been factory set and sealed and is a field non-
adjustable part. Tampering with the factory setting
may cause personal injury and/or property dam-
age and will void the manufacturer warranty. For
replacement parts refer to exploded views.
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