HOTSY 771/772 • 8.941-246.0 • Rev. 12/10
9
PRESSURE WASHER
OPERATOR’S MANUAL
INSTALLATION INSTRUCTIONS
Getting Started
IMPORTANT: Proper initial installation of equipment
will assure more satisfactory performance, longer
service life, and lower maintenance cost.
IMPORTANT: The use of a backflow-preventer on
the water supply hose is recommended and may be
required by local codes.
The pressure washer should be run on a level surface
and in a protected area where it is not readily influenced
by outside forces such as strong winds, freezing
temperatures, rain, etc. The pressure washer should
be located to assure easy access for filling of fluids,
adjustments and maintenance. Normal precautions
should be taken by the operator to prevent moisture
from reaching the pressure washer. It is recommended
that a partition be made between the wash area and the
pressure washer to prevent direct spray from the wand
from coming in contact with the pressure washer. Moisture
reaching the equipment will reduce the pressure washer’s
service life. All installations should comply with the local
codes covering such installations.
Venting
DANGER: Do not run machine indoors or in an
enclosed area without proper ventilation, as exhaust
fumes may be hazardous to your health.
DANGER: Do not operate machine in areas where
flammable vapors (gasoline, solvents, etc.) may be
present, as this machine may ignite the vapors.
DANGER: Some gases are heavier than air and will
spill out on the floor in the time required for the safety
pilot valve to close off gas supply. Therefore, always
provide adequate space and ventilation around this
pressure washer.
CAUTION: All venting must be in accordance
with applicable federal and state laws, and local
ordinances. Consult local heating contractors.
If the pressure washer is to be used in an enclosed area,
a flue must be installed to vent burner exhaust to the
outside atmosphere. Be sure the flue is the same size
as the burner exhaust vent on the pressure washer lid.
Poor draft will cause the pressure washer to soot and
not operate properly. When selecting the location for
installation, beware of poorly ventilated locations or areas
where exhaust fans may cause an insufficient supply of
oxygen. Proper combustion can only be obtained when
there is a sufficient supply of oxygen available for the
amount of fuel being burned. If it is necessary to install
the machine in a poorly ventilated area, outside fresh air
may have to be piped to the burner and a fan installed to
bring sufficient air into the machine. Locate the pressure
washer so that the flue will be as straight as possible and
protrude through the roof at a proper height and location
to provide adequate draft. This gas fired pressure washer
must have a draft diverter installed in the flue (available
from most heating contractors). A draft diverter will permit
proper upward flow of exhaust flue gases.
Using LP Vapor Fuel From A Portable Bottle
CAUTION: Have a qualified gas service technician
install and service your equipment.
The model 771 has been factory built to use LP Vapor
fuel.
DO NOT USE LIQUID FUEL.
You will need the following items:
• LP vapor fuel tank. We recommend using a mini-
mum 30-40 lb. bottle. Bottle must have a shut-off
valve.
• LP gas hose. Four foot long minimum, 3/4" inside
diameter. Must have 3/4" male NPT thread end
to attach to machine. Available through Hotsy,
Part Number 707452. This hose is supplied in the
771 Portable Gear/LP Bottle Rack Kit, Part Number
280771.
• Gas primary regulator. Controls the pressure from
the gas bottle into the gas valve. Regulator must
be capable of handling 376,000 BTU/Hr. with an
adjustment range of 12.0 to 14.0 water column
inches. Available through Hotsy, Part Number
860178.
• Gas pressure gauge or gas manometer
• 10" Adjustable wrench
• Medium Phillips head screwdriver
• Large slot head screwdriver
• 3/16" Allen wrench
• Pipe thread sealing compound for gas
connections
1. Disconnect the machine from the power source.
2. Remove the chassis front panel to gain access to the
gas valve. Refer to
Figure 4.
3. Turn the gas valve ON/OFF knob to the OFF
position.
30 - 40
lbs.
LP
Vapor
Tank
Figure 4 - LP Vapor Gas
To
Burner
Ring
ON/OFF
Knob
Gas Valve
✽
Gauge
Front Chassis
Panel
✽
Pressure
Hose (707214)
Inlet Pressure Tap
✽
Primary
Regulator
(860178)
✽
Shut-
Off
Valve
✽
Not Supplied w/Machine
