8
VNG/VLP SERIES PRESSURE WASHER
OPERATOR’S MANUAL
A manual shut-off valve shall be installed in the gas sup-
ply line external to the appliance. See Figure 2. The gas
line should be a separate supply direct from the meter to
the burner. It is recommended that new pipe be used
and located so that a minimum amount of work will be
required in future servicing. The piping should be installed
to be durable, substantial and gas tight. It should be clear
and free from cutting burrs and defects in structure of
threading. Cast iron fittings or aluminum tubing should
not be used for the main gas circuit. Joint compounds
(pipe dope) should be used sparingly on male threads
only and be approved for all gases.
Propane Gas:
The following pipe sizes should be used between the
regulator and the gas valve on the burner.
Distance From Regulator Pipe Size
0 - 50' 1" 1 PS
50' - 100' 1-1/2" 1 PS
100' - 200' 1-3/4" 1 PS
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 fur-
nace pipe.
When venting the machine, if the machine is to be in an
enclosed 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 machine to soot and not operate efficiently.
When placing the machine for installation, keep in mind
that the machine should be positioned in such a manner
that the stack will be as straight as possible and pro-
trude 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 machine should be installed with a
down draft diverter.
Input - BTU Per Hour Draft Hood & Flue Pipe Size
410,000 - 600,000 10 inch
600,000 - 750,000 12 inch
Draft Diverter:
The draft diverter (figure 4) 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 positioned 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
Ventilating Air Opening
1 square inch for each
1000 BTU per hour input.
Illustration showing air openings necessary
to supply air for combustion when heating
appliance is installed in an enclosed room.
