VNG/VLP SERIES PRESSURE WASHER
OPERATOR’S MANUAL
9
Natural Gas:
The following pipe sizes should be used between the meter
and the cleaner.
Distance From Regulator
Pipe Size
0 - 50'
1-1/2" 1 PS
50' - 100'
2" 1 PS
100' - 200'
2-1/2" 1 PS
Venting:
Because this machine is installed indoors, regulations or
ventilation concerns may call for a chimney or furnace
pipe.
When venting the unit, if the machine is to be in an en-
closed area with a stack on it, be sure the flue pipe is the
same size as the stack on the machine. Poor draft will
cause the unit to soot and not operate efficiently. When
placing the unit for installation, keep in mind that the unit
should be positioned in such a manner that the stack will
be as straight as possible and protrude through the roof
of the building at a proper location and at sufficient height
to eliminate down draft. The flue pipe of a gas fired unit
should be installed with a down draft diverter.
Input - BTU Per Hour
Draft Hood & Flue Pipe Size
250,000 - 320,000
8 inch
320,000 - 410,000
9 inch
410,000 - 600,000
10 inch
600,000 - 750,000
12 inch
Draft Diverter:
The draft diverter should be installed at least one (1) foot
above the heating coil. The diverter serves to sever the
chimney effect created in all sections of flue pipe posi-
tioned below to enhance the draft through the burner. It
also helps prevent freezing of the coil due to wind chill
factors.
Figure 4
standard on all machines
When the pressure washer is installed in a tightly closed
room without ventilation openings to the outdoors or other
rooms, provisions shall be made for supplying air for com-
bustion through special openings, one near the floor line
and the other near the ceiling, each to be sized on the
basis of one square inch or more of free area for each
1,000 BTU input per hour. See Figure 5.
When a room is of unusually tight construction and has a
ventilating fan, which may be used for exhausting air to
outdoors - or has a vented fireplace - it is recommended
that combustion air be supplied to the enclosed room
through intakes extending to the outside of the building
and terminating in downturned fittings, suitably arranged
to prevent obstruction from snow or rain, and including a
protecting screen not smaller than 1/4 inch mesh.
Figure 5
Water Source:
Water source for unit should be supplied by a 5/8” I.D.
garden hose with a city water pressure of not less than 30
psi. If the water supply is inadequate, or if the garden hose
is kinked, the unit will run very rough and the burner will
not fire.
Water Connection:
Connect the high pressure hose by pulling the coupler
collar back and then inserting it onto the discharge nipple.
Secure it by pushing the collar forward.
Attach the wand into the trigger gun using teflon tape on
the pipe threads to avoid leaks.
ventilating air opening
1 square inch for each
4000 BTU per hour input.
Illustration showing air openings necessary to
supply air for combustion when heating
appliance is installed in an enclosed room.