10
PHW SERIES PRESSURE WASHER
OPERATOR’S MANUAL
LANDA PHW • 9/02
4. After circulating solution, clean and drain float tank
and flush entire system with fresh water. Replace
nozzle in wand.
Spray Nozzles:
Each machine is equipped with one spray nozzle. Differ-
ent spray nozzles are calibrated for each machine de-
pending on the flow and pressure of that particular model.
Spray nozzles vary in bore size and angle of spray. Popu-
lar spray angles are 0°, 15°, 25° and 40°. When order-
ing, please specify size and angle of nozzle. Nozzle size
for each machine is located on the serial plate.
Unloader Valves:
Unloader valves are preset and tested at the factory be-
fore shipping. Occasional adjustment of unloader may
be necessary to maintain correct pressure. (See section
in manual and consult your local
LANDA Dealer for the
correct procedures in adjusting the unloader valve.)
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 the winter months, when temperatures drop be-
low 32° F, protecting your machine against freezing is
necessary. 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 the float tank strainer fit-
ting and, by injecting compressed air, all water will be
blown out of the system.
Low Pressure Diagnosis:
Refer to the low pressure section of the troubleshooting
guide. If, by referring to the guide, the trouble is found to
be either the unloader or pump, your next step is to de-
termine which is the problem. This can be done by elimi-
nating the unloader from the system and attaching the
discharge hose directly to the pump. If high pressure is
present, then the unloader needs repairing or replacing.
CAUTION: When using this procedure to test com-
ponents, keep spray gun open at all times.
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/unloader to inlet side
of coil.
2. Disconnect the electrical connections to the thermo-
stat or remove thermostat sensor.
3. Remove all the fittings from the discharge and inlet
side of the coil.
4. Remove the burner assembly from the combustion
chamber.
5. Remove 3 - 3/8" bolts from either side of coil and
tank assembly (these bolts are used to fasten tank
and handles to chassis).
6. Remove the two 3/8" nuts which are underneath the
bottom wrap (to keep the coil from moving).
7. Remove tank top wrap exposing insulation and coil.
Carefully bend insulation tabs at exhaust stack.
8. Carefully fold back the insulation and remove the
coil.
9. Replace or repair any insulation found to be torn or
broken.
10. Reinstall new or cleaned coil by reversing steps 8
through 1.
Temperature and Pressure Relief Valve:
(Pump Protector)
Machines with spray gun control offer the operator the
convenience of stopping and starting the flow of water at
the end of the discharge hose. When the spray gun stops
the flow of water, the unloader valve, back at the ma-
chine, opens and recycles the cold water back to the
inlet side of the pump. Recycling for longer than five min-
utes causes the cold water within the pump to heat up.
To avoid damage to the pump, a temperature and pres-
sure relief valve is installed next to the inlet side of the
pump that will open in the event the water temperature
exceeds 140° F. Therefore, while operating the machine,
do not leave the spray gun closed for an extended pe-
riod of time.
High Limit Hot Water Thermostat:
For safety, machines are equipped with a high limit snap
switch. If the temperature of the water should exceed its
operating temperature, the high limit snap switch ther-
mostat will turn the burner off until the water cools, then
it will automatically reset itself.
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
the disk ruptures, it will need to be replaced. Torque
replacement disk to 35 lbs.
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