LANDA SEHW • 8.913-932.0 • Rev. 02/12a
OPERA
TOR’S MANU
AL
PRESSURE
W
ASHER
18
MAINTENANCE & SERVICE
Unloader Valve:
The unloader valve traps pressure in the line when the
spray gun is closed. Machines with unloader valves
are preset and tested at the factory before shipping.
Tampering with the factory setting may cause per-
sonal injury and/or property damage, and will void the
manufacturer's warranty. Occasional adjustment of the
unloader may be necessary to maintain correct pres-
sure. Consult your local Landa Dealer for the correct
procedure in adjusting the unloader valve.
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 below
32°F, protecting your machine against freezing is nec-
essary. Siphoning a small amount of antifreeze into the
system is recommended. This is done by pouring a
50/50 mix of antifreeze and water into the float tank and
then siphoning 100% antifreeze through the detergent
line with the pump on. If compressed air is available,
an air fitting can be screwed into float tank strainer fit-
ting and, by injecting compressed air, all water will be
blown out of the system.
Low Pressure Diagnosis:
Refer to Troubleshooting Chart for low pressure. If, by
referring to the chart, the trouble is found to be either
the unloader or pump, your next step is to determine
which is the problem. This can be done by eliminating
the unloader from the system and attaching the dis-
charge hose directly to the pump. If high pressure is
present, then the unloader needs repairing.
CAUTION: When using this procedure to test com-
ponents, keep spray gun open at all times.
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 which follow.
Coil Removal:
Removal of the coil, because of freeze breakage or to
clean soot from it, can be done quickly and easily.
1. Disconnect hose from pump to inlet side of the coil.
2. Carefully disconnect thermostat sensor, making
sure you do not crimp capillary tube.
3. Remove all the fittings from the inlet and discharge
side of coil.
4. Remove the burner assembly from the combustion
chamber.
5. Remove the 3-3/8
" bolts from each side of coil and
tank assembly (these bolts are used to fasten tank
and handles to chassis).
6. Remove the two bolts which are underneath the
bottom wrap (to keep the coil from moving).
7. Remove tank top wrap exposing insulation
and coil.
8. Bend back insulation tabs.
9. Carefully fold back the insulation and remove
insulation retainer plates and coil.
10. Replace or repair any insulation found to be torn
or broken.
11. To reinstall new or cleaned coil, reverse steps 9
through 1.
High Limit Hot Water 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.
CAUTION: The thermostat uses a capillary tube. Do
not bend or strike with any object.
Summary of Contents for SEHW6-3500
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