VNG/VLP SERIES PRESSURE WASHER
OPERATOR’S MANUAL
13
MAINTENANCE AND SERVICE
Spray Nozzles
Each machine is equipped with one or more spray
nozzles, depending on model. Different spray nozzles
are calibrated for each machine depending on the flow
and pressure of that particular model. Spray nozzles vary
in bore size and angle of spray. Popular spray angles are
0°, 15°, 25°, 40°. When ordering, please specify size and
angle of nozzle. Nozzle size for each machine is located
on the serial plate.
Unloader Valves:
Unloader valves relieve pressure in the line when the
shut-off spray gun is closed. Unloader valves are preset
and tested at the factory before shipping. Occasional ad-
justment of the unloader may be necessary to maintain
correct pressure.
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. 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 fitting and by
injecting compressed air, all water will be blown out of
the system. The use of a draft diverter will prevent the
wind chill factor from freezing the coil.
Low Pressure Diagnosis
(Machines with shut-off spray gun)
Refer to the Troubleshooting Chart for low pressure. If,
after referring to the chart, the trouble is found to be ei-
ther the unloader or the pump, your next step is to deter-
mine which one is the problem. This can be done by
eliminating the unloader from the system and attaching
a 50' charge hose directly to the pump. If high pressure
is developed in this manner the pump is good, and the
unloader needs to be repaired or replaced. If low pres-
sure is still present the pump needs repairing. CAUTION:
When using this procedure to test components, keep
the shut-off spray gun open at all times.
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.
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 through use of the dipstick found on the top of
the pump or by the red dot visible through the oil gauge
window. Oil should be maintained at that level.
HEATING COIL
Condensation from Heating Coil
When cold water is being pumped into the water heater
coil, and the burner is on, condensation will form on the
coil and drip down into the burner compartment, giving
the appearance of a leaking coil, particularly on cold hu-
mid days.
To Check Water Heater Coil for Leaks:
With the main burner “OFF” start machine and allow it to
run a few minutes. Check into the burner compartment
with a drop light or flashlight. If no leaks are visible, then
water dripping from coil is from condensation.
Deliming Coil:
Periodic coil deliming is recommended.
1. Fill a container with 4 gallons of water, then add 1 lb.
of deliming powder. Mix thoroughly.
2. Remove nozzle from spray gun assembly and put
spray gun into container.
3. Attach a short section (3-5 ft.) of garden hose to
machine to siphon solution from an elevated con-
tainer or add mixture to the float tank. Turn pump
switch on allowing solution to be pumped through
coil and back into the container. Solution should be
allowed to circulate 2-4 hours.
4. After circulating solution flush entire system with
fresh water. Reinstall nozzle in spray gun.
GAS VALVE REGULATOR
ADJUSTMENT
Adjustment of the built-in regulator isn’t normally neces-
sary, since it is preset at the factory. However, field ad-
justment may be accomplished as follows:
1. Attach manometer at pressure tap port.
2. Remove regulator adjustment screw cap.
