Landa SDHW5-3000, Operator'S Manual, Page: 9 / 30

SDHW SERIES PRESSURE WASHER
OPERATOR’S MANUAL
9
LANDA SDHW • REV. 12/02
MAINTENANCE AND SERVICE
Unloader Valves
Unloader valves relieve pressure in the line when a spray
gun is closed. Unloader valves are preset and tested at
the factory before shipping. Occasional adjustment of
the unloader may be necessary to maintain correct pres-
sure.
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.
During winter months, when temperatures drop below
32° F, protecting your machine against freezing is nec-
essary. Store the machine in a heated room. If this is not
possible, then mix a 50/50 solution of anti-freeze and
water in the float tank. If compressed air is available,
screw an air fitting into the anchor connector beneath
the 1/2" basket strainer inside the float tank. By injecting
compressed air, all water will be blown out of the sys-
tem.
High Limit Hot Water Thermostat
For safety, each machine is equipped with a high limit
control switch. In the event that the temperature of the
water should exceed its operating temperature, the high
limit control will turn the burner off until the water cools.
Pumps
Use only SAE 30 weight non-detergent oil. Change oil
after first 50 hours of use. Thereafter, change oil every
three months or at 500 hour intervals. Oil level should be
checked using dipstick found on top of pump or by check-
ing red dot visible through oil gauge window. Oil should
be maintained at that level.
Cleaning of Coils
In alkaline water areas, lime deposits can accumulate
rapidly inside coil pipes. This growth is increased by ex-
treme heat build up in the coil. The best prevention for
liming conditions is to use high quality cleaning deter-
gents. In areas where alkaline water is an extreme prob-
lem, periodic use of Landa Deliming Powder (Landa Part
#9-028008) will remove lime and other deposits before
the coil becomes plugged. (See Deliming Instructions
for use of Landa Deliming Powder.)
Deliming Coils
Periodic flushing of coils or optional float tank is recom-
mended.
Step 1 Fill a container with 4 gallons of water, then
add 1 lb. of deliming powder. Mix thoroughly.
Step 2 Remove wand assembly from spray gun and
put spray gun into container. Secure the trig-
ger on the spray gun into the open position.
Step 3 Attach a short section (3-5 ft.) of garden hose
to machine to siphon solution from an elevated
container. Turn engine on, allowing solution to
be pumped through coils back into the con-
tainer. Solution should be allowed to circulate
2-4 hours.
Step 4 After circulating solution, flush entire system
with fresh water. Reinstall wand assembly to
spray gun.
Removal of Soot from Heating Coil
In the heating process fuel residue, in the form of soot
deposits, may develop between the heating coil pipe and
may block air flow which affects 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 (See Coil Removal on page 11).
Rupture Disk
If pressure from pump or thermal expansion should ex-
ceed safe limits, the rupture disk will burst, allowing high
pressure to be discharged through hose to ground. When
disk ruptures it will need to be replaced. Torque to 35 ft.
lbs.
Fuel
Use clean fuel oil that is not contaminated with water
and debris. Replace fuel filter and drain tank every 100
hours of operation.
NEVER use gasoline in your burner or diesel fuel tank.
Gasoline is more combustible than fuel oil and could re-
sult in a serious explosion.
NEVER use crankcase or
waste oil. Fuel burner and diesel engine malfunction could
result from contamination in fuel.
Fuel Control System
This machine utilizes a fuel solenoid valve located on
the fuel pump to control the flow of fuel to the combus-
tion chamber. The solenoid, which is normally closed, is
activated by a flow switch when water is flowing through
it. When an operator releases the trigger on the spray
gun, the flow of water through the flow switch stops, turn-
ing off the electrical current to the fuel solenoid.
The solenoid then closes, shutting off the supply of fuel
to the combustion chamber. Controlling the flow of fuel
in this way gives an instantaneous burn-or-no-burn situ-
ation, thereby eliminating high and low water tempera-
tures, and combustion smoke normally associated with
machines incorporating a spray gun.